6.1 - Personal Protective Equipment and Refrigerant Exposure

Module: Safety Leak Detection Shipping and Safe Disposal
Safety/source verification date: August 10, 2026
Primary safety sources: Current EPA Section 608 test topics, OSHA personal-protective-equipment and Hazard Communication requirements, and NIOSH chemical first-aid guidance
Course role: Establishes the personal protective equipment, direct-contact exposure, Safety Data Sheet, manufacturer-instruction, and first-response fundamentals needed before later Module 6 sections address respiratory hazards, fire hazards, refrigerant safety classifications, and pressure testing

Learning Objectives

After completing this section, a student should be able to:

1. Identify the principal personal protective equipment (PPE) used when handling refrigerants and explain why PPE must be selected for the specific refrigerant and task.
2. Explain why liquid refrigerant or a rapidly expanding refrigerant stream can cause severe cold injury, including frostbite, to skin and eyes.
3. Distinguish the roles of safety glasses, chemical-splash goggles, face shields, gloves, and protective clothing.
4. Locate hazard, first-aid, handling, and PPE information in a Safety Data Sheet (SDS).
5. Apply safe first-response principles to refrigerant contact with the skin or eyes without relying on unsafe one-size-fits-all first-aid rules.
6. Explain why the refrigerant manufacturer’s SDS, equipment instructions, workplace hazard assessment, and applicable safety requirements must be checked before service.

Introduction

EPA Section 608 preparation is not limited to environmental regulations and refrigerant-recovery procedures.

Technicians also need to recognize the hazards created when refrigerant contacts the body.

EPA’s current Section 608 test-topic guidance specifically includes:

• Risks of exposure to refrigerant.
• Frostbite.
• Gloves.
• Goggles.
• Respiratory protection in extreme cases.

This section focuses on direct personal exposure and the protective measures used before an exposure occurs.

The most important starting principle is:

Know the refrigerant
+
know the task
+
read the SDS
+
follow manufacturer instructions
+
select the correct PPE

A single PPE combination is not correct for every refrigerant and every service task.

A technician may be working with:

• A nonflammable fluorinated refrigerant.
• A mildly flammable or flammable refrigerant.
• Carbon dioxide.
• Ammonia.
• Refrigerant mixed with contaminated oil.
• Refrigerant released from a system at high pressure.
• A product with refrigerant-specific chemical, thermal, or exposure hazards.

The exact hazards therefore depend on the refrigerant, its physical state, its pressure and temperature, the work being performed, and the surrounding environment.

This section establishes the protective principles that apply broadly while emphasizing that the specific SDS and manufacturer instructions control the detailed safety procedure for the product being handled.

Detailed respiratory and confined-space hazards are covered in Section 6.2 - Respiratory and Confined-Space Hazards.

Fire, ignition, and thermal-decomposition hazards are covered in Section 6.3 - Fire Explosion and Decomposition Hazards.

Refrigerant toxicity and flammability classifications are covered in Section 6.4 - Refrigerant Safety Classifications.

Key Concepts

1. PPE Is a Layer of Protection

Personal protective equipment (PPE) is equipment worn to reduce exposure to a workplace hazard.

Examples relevant to refrigerant service include:

• Safety glasses.
• Chemical-splash goggles.
• Face shields.
• Protective gloves.
• Protective clothing.
• Protective footwear when required by the task.
• Respiratory protection when required by a properly established respiratory-protection program.

PPE is important, but PPE does not make an unsafe procedure safe.

A useful safety sequence is:

Recognize the hazard
→ control the hazard where possible
→ select task-appropriate PPE
→ perform the work using the correct procedure

For example, goggles and gloves do not justify intentionally releasing refrigerant toward a technician.

Likewise, wearing a face shield does not make it acceptable to disconnect a hose carelessly from a pressurized system.

2. Refrigerant PPE Is Task-Specific

The correct PPE depends on:

• The refrigerant.
• The refrigerant’s pressure and temperature.
• Whether liquid refrigerant may be released.
• Whether splashing is possible.
• Whether contaminated refrigerant oil is present.
• Whether the task includes recovery, charging, hose disconnection, cleanup, or another operation.
• The chemical-resistance and temperature-resistance properties of the PPE.
• Manufacturer instructions.
• The SDS.
• Workplace hazard-assessment requirements.

The correct rule is therefore not:

Any glove + any glasses = safe

The correct rule is:

Hazard assessment
+
SDS
+
manufacturer instructions
→ appropriate PPE selection

3. Liquid Refrigerant Can Cause Frostbite

Many refrigerants used in refrigeration and air-conditioning systems can exist as liquids under pressure.

If liquid refrigerant escapes to a lower pressure, part of it can vaporize rapidly.

Vaporization requires energy.

The escaping refrigerant can obtain part of that energy as heat from:

• Skin.
• Eye tissue.
• Clothing.
• Nearby surfaces.

This rapid heat removal can cool tissue enough to produce a cold burn or frostbite.

The basic physical sequence is:

Pressurized liquid refrigerant escapes
→ pressure falls
→ rapid boiling / flashing occurs
→ refrigerant absorbs heat
→ exposed tissue cools rapidly
→ frostbite may occur

This is why a refrigerant that may not be highly toxic can still cause a serious injury by direct contact.

4. The Eyes Require Special Protection

The eyes are especially vulnerable because a small release from a:

• Service hose.
• Gauge connection.
• Schrader-type access point.
• Recovery-machine connection.
• Charging hose.
• Cylinder connection.

can direct refrigerant toward the face.

Eye protection must match the hazard.

Safety glasses provide important impact protection, but where a chemical or liquid splash hazard exists, chemical-splash goggles may provide more appropriate coverage.

When a task presents a significant face-splash hazard, a face shield may be added.

A critical distinction is:

Face shield
≠
replacement for primary eye protection

OSHA guidance treats a face shield as secondary protection when used for eye/face hazards. Appropriate safety glasses or goggles remain the primary eye protection beneath it.

5. Gloves Must Match the Hazard

Gloves should protect the hands from the hazards reasonably expected during the task.

Refrigerant work may involve:

• Contact with very cold liquid or vapor.
• Chemical exposure.
• Refrigerant oil.
• Contaminated oil.
• Sharp sheet-metal edges.
• Hot surfaces.
• Other service chemicals.

One glove material cannot be assumed to protect against every hazard.

Glove selection should consider:

• Chemical compatibility.
• Cold-contact protection.
• Dexterity needed for the task.
• Duration of use.
• Condition of the glove.
• Manufacturer information.
• SDS recommendations.

OSHA requires appropriate hand protection to be selected according to the hazards, task, conditions, duration of use, and performance characteristics of the glove.

6. Protective Clothing Reduces Skin Exposure

Protective clothing can reduce the amount of skin exposed if refrigerant or contaminated material is released.

Depending on the task and the SDS, this may include:

• Long sleeves.
• Long pants.
• Protective work clothing.
• Chemical-resistant apron or coveralls for specific cleanup tasks.
• Appropriate footwear.
• Additional protection required by the manufacturer or workplace hazard assessment.

Protective clothing should be:

• In good condition.
• Appropriate to the expected hazard.
• Worn so that it does not create a separate snag, heat, electrical, or rotating-equipment hazard.
• Removed or managed according to the SDS if contaminated.

A technician should not assume that ordinary fabric automatically provides adequate protection from a liquid refrigerant release.

7. Know the Difference Between Cold Injury and Chemical Exposure

A refrigerant exposure may create more than one type of hazard.

Possible effects include:

• Cold injury from rapid evaporation or contact with a cold liquid.
• Eye irritation or injury from liquid or vapor contact.
• Skin irritation from the refrigerant, oil, contaminants, or cleaning chemicals.
• Respiratory effects from inhalation.
• Toxic effects that vary by refrigerant and concentration.

The first-aid response can differ depending on the actual material and injury.

Therefore:

Do not assume that one first-aid rule applies to every refrigerant exposure.

Use the specific SDS and appropriate emergency guidance.

8. The SDS Is a Primary Safety Tool

A Safety Data Sheet (SDS) provides standardized hazard and handling information for a chemical product.

Older HVAC study materials may use the term:

MSDS
Material Safety Data Sheet

Current OSHA Hazard Communication terminology is:

SDS
Safety Data Sheet

For refrigerant work, several SDS sections are especially useful.

For a routine service task, Sections 2, 4, 7, and 8 should be especially familiar.

A good preparation sequence is:

Before service:
Section 2 → What can hurt me?
Section 7 → How should I handle it?
Section 8 → What controls and PPE are required?

Before an emergency occurs:
Section 4 → What first aid is specified?
Section 6 → What should be done after a release?

9. Manufacturer Instructions Are Part of Safe Service

The refrigerant SDS identifies chemical hazards, but the equipment manufacturer’s instructions identify hazards associated with the appliance and service procedure.

Manufacturer instructions may specify:

• Required PPE.
• Safe service positions.
• Isolation procedures.
• Pressure limits.
• Correct connection and disconnection procedures.
• Approved service tools.
• Ventilation requirements.
• Ignition-source restrictions.
• Procedures for specific refrigerants.
• Emergency precautions.

The refrigerant SDS and the equipment instructions serve different purposes.

Refrigerant SDS
→ chemical/product hazards and protective measures

Equipment instructions
→ appliance-specific service hazards and procedures

Both may be needed.

Technical and Safety Details

1. Why Refrigerant Can Freeze Tissue

A common examination concept is that liquid refrigerant can cause frostbite.

The reason is tied to phase change.

When pressurized liquid refrigerant is released:

1. The pressure decreases.
2. A portion of the refrigerant rapidly boils.
3. Boiling requires latent heat.
4. Heat is removed from the refrigerant’s surroundings.
5. Skin or eye tissue in contact with the release can cool rapidly.

The injury is therefore not simply caused by the refrigerant being “cold in the cylinder.”

The rapid phase change can make the exposure more severe.

This same principle explains why frost can form on a service connection when liquid refrigerant flashes during a release.

2. High-Pressure Jets Increase the Exposure Hazard

Refrigerant systems may operate at substantial pressure.

A pressurized release can:

• Direct refrigerant toward the eyes or face.
• Penetrate gaps in clothing.
• Spray contaminated oil.
• Cause rapid cooling at the point of release.
• Move a hose or fitting unexpectedly if it is not secured.

For this reason:

Pressure control
+
correct hose procedure
+
PPE

are all necessary.

PPE should not be treated as a substitute for controlling the pressurized release.

3. Eye-Protection Selection

A simplified teaching comparison is:

The exact protection must come from the task hazard assessment, SDS, and applicable workplace requirements.

4. Hand-Protection Selection

Do not choose gloves only because they are comfortable or because they are commonly called “work gloves.”

Ask:

What material can contact the glove?
What temperature exposure is possible?
How long can contact last?
What dexterity is needed?
Is there a cut or abrasion hazard?
What does the SDS recommend?

A glove that performs well against abrasion may not provide the chemical resistance needed for a cleanup task.

A glove that provides chemical resistance may not provide sufficient cold protection for direct contact with a cryogenic or rapidly evaporating liquid.

The correct glove must be selected for the actual combination of hazards.

5. Inspect PPE Before Use

PPE can fail if damaged.

Before beginning refrigerant work, inspect applicable PPE for:

• Cracks.
• Tears.
• Holes.
• Chemical degradation.
• Clouded or damaged lenses.
• Broken straps.
• Poor fit.
• Contamination from earlier work.

Damaged PPE should not be treated as adequate protection merely because it is being worn.

6. Keep PPE Available During the Entire Task

Exposure can occur:

• While making the first connection.
• While recovering refrigerant.
• During charging.
• While disconnecting hoses.
• While opening a recovery-cylinder valve.
• During cleanup.
• While handling contaminated oil.
• After the “main” service task appears complete.

Removing eye protection or gloves before the pressurized refrigerant connections are safely handled defeats their purpose.

7. Contaminated Refrigerant and Oil Can Add Hazards

Recovered refrigerant may contain:

• Refrigeration oil.
• Moisture.
• Acids.
• Compressor-burnout residue.
• Other contaminants.

A contaminated system can therefore create hazards in addition to the direct cold effect of liquid refrigerant.

When handling contaminated oil or residue:

• Review the applicable SDS information.
• Protect the eyes and skin.
• Use gloves and protective clothing appropriate to the chemical exposure.
• Avoid splashing.
• Follow the cleanup and disposal procedure specified for the material.

Detailed system-contamination concepts were introduced in Section 3.6 - Moisture Acid and Noncondensables.

Refrigerant Exposure and First Response

1. First Principle: Stop the Exposure Safely

If a refrigerant exposure occurs, the first objective is to prevent continued exposure without creating another victim.

A general sequence is:

Recognize exposure
→ move away from the release / stop exposure if safe
→ alert others and obtain assistance
→ use the product-specific SDS first-aid instructions
→ obtain medical evaluation when indicated

Do not remain in a dangerous atmosphere simply to retrieve tools or equipment.

Respiratory emergencies and entry into contaminated spaces are covered in Section 6.2.

2. Skin Contact Without Frostbite

If skin contact occurs but the tissue is not frozen, current NIOSH chemical first-aid guidance generally directs washing contaminated skin with soap and water when that procedure is specified for the chemical.

However, the specific refrigerant SDS must be checked, because the correct procedure depends on the material.

The important distinction is:

Skin contamination without freezing
≠
frostbitten / frozen tissue

Do not use the same response automatically for both.

3. Skin Frostbite

Current NIOSH first-aid guidance for skin frostbite includes several important precautions:

• Seek medical attention immediately.
• Do not rub the affected area.
• Do not flush frostbitten tissue with water.
• Do not remove clothing that is frozen to frostbitten tissue.

This is a high-priority safety distinction.

Older generic HVAC first-aid statements sometimes tell the reader simply to flush any refrigerant skin exposure with water. That is too broad.

For examination preparation and safe practice, remember:

FROSTBITTEN / FROZEN SKIN
→ do not rub
→ do not flush the frozen tissue with water
→ do not pull away clothing frozen to tissue
→ obtain immediate medical attention

Follow the refrigerant-specific SDS and emergency medical guidance.

4. Eye Exposure

Eye exposure requires prompt attention.

NIOSH distinguishes between frozen and non-frozen eye tissue.

If eye tissue is frozen:

Seek medical attention immediately

If the eye tissue is not frozen, NIOSH guidance calls for immediately flushing the eyes thoroughly with large amounts of water for at least:

15 minutes

while periodically lifting the upper and lower eyelids.

Persistent:

• Pain.
• Irritation.
• Swelling.
• Tearing.
• Light sensitivity.

requires medical attention as soon as possible.

The refrigerant’s SDS may call for medical attention even when symptoms appear mild, so the product-specific instructions must be followed.

5. Do Not Improvise Medical Treatment

A technician should know immediate safety actions but should not invent medical treatment.

Avoid unsafe assumptions such as:

• “Every refrigerant burn should be treated exactly the same.”
• “If water is good for one exposure, it must be good for every exposure.”
• “If the skin is numb, the injury cannot be serious.”
• “If vision returns quickly, medical evaluation is unnecessary.”
• “A face shield means eye injury cannot occur.”

Use:

• SDS Section 4.
• Emergency medical guidance.
• Employer emergency procedures.
• Appropriate medical professionals.

Safety Data Sheet Workflow

Before Handling a Refrigerant

A technician should be able to answer:

1. What refrigerant is in the system?
2. What are its major hazards?
3. What eye protection is required?
4. What glove material or type is recommended?
5. Is additional protective clothing required?
6. What ventilation or respiratory precautions apply?
7. What first-aid procedure applies to skin exposure?
8. What first-aid procedure applies to eye exposure?
9. What emergency telephone or manufacturer contact is listed?
10. What incompatible conditions or materials must be avoided?

If these questions cannot be answered, the technician is not ready to begin the task.

Rapid SDS Lookup

Need hazard information?
→ Section 2

Need first aid?
→ Section 4

Need spill/release response?
→ Section 6

Need handling/storage precautions?
→ Section 7

Need PPE/exposure-control information?
→ Section 8

Need incompatible-material or decomposition information?
→ Section 10

SDS Versus Label

A container label provides important immediate hazard information, but it does not replace the SDS.

The label helps identify:

• The product.
• Hazard pictograms when applicable.
• Signal word.
• Hazard statements.
• Precautionary statements.

The SDS provides more detailed information for:

• First aid.
• PPE.
• Exposure controls.
• Handling.
• Storage.
• Emergency response.

Both should agree with the product being used.

Task-Based PPE Review

The following table is a study framework, not a substitute for a workplace hazard assessment or product SDS.

A recurring theme is:

Correct procedure
+
correct PPE

not one or the other.

Important Terms

Personal Protective Equipment (PPE)

Equipment worn to minimize exposure to hazards.

Examples include eye protection, gloves, protective clothing, and—where properly required—respiratory protection.

Safety Data Sheet (SDS)

A standardized document containing information about a hazardous chemical’s identity, hazards, first-aid measures, handling and storage, exposure controls, PPE, stability, and other safety information.

MSDS

Material Safety Data Sheet, the older term commonly found in older HVAC and refrigeration references.

Current OSHA Hazard Communication terminology is Safety Data Sheet (SDS).

Frostbite

A freezing injury to body tissue caused by sufficiently low temperature.

In refrigerant service, frostbite can result when liquid refrigerant or a rapidly expanding refrigerant stream removes heat rapidly from skin or eye tissue.

Chemical-Splash Goggles

Eye protection designed to provide more complete coverage against liquid or chemical splash than ordinary spectacles.

Face Shield

Secondary face protection used when a hazard assessment indicates additional protection is needed.

A face shield does not automatically replace primary eye protection.

Hazard Assessment

An evaluation of workplace hazards used to determine whether PPE is necessary and what PPE is appropriate.

First-Aid Measures

Immediate care instructions for an exposed person before professional medical treatment is available.

SDS Section 4 provides the product-specific first-aid information.

EPA 608 Exam Focus

EPA’s current Section 608 test-topic guidance explicitly lists:

Risks of exposure to refrigerant
+
frostbite
+
gloves
+
goggles
+
SCBA in extreme cases

For Section 6.1, focus on the following ideas.

1. Liquid Refrigerant Can Freeze Skin and Eyes

A likely examination relationship is:

Liquid refrigerant exposure
→ rapid heat removal
→ frostbite / cold injury

Do not assume a refrigerant is harmless merely because it has relatively low toxicity.

2. Protect the Eyes and Hands

For basic EPA 608 examination preparation:

Refrigerant handling
→ eye protection
+
protective gloves

In actual service, the exact protection must be selected from the hazard assessment, SDS, and manufacturer instructions.

3. A Face Shield Is Not the Same as Goggles

Remember:

Face shield
→ additional face protection

Goggles / approved primary eye protection
→ direct eye protection

Where a face shield is needed, it is normally used over appropriate primary eye protection.

4. Know Where First-Aid Information Is Found

SDS Section 4
→ First-Aid Measures

5. Know Where PPE Information Is Found

SDS Section 8
→ Exposure Controls / Personal Protection

6. MSDS Is Older Terminology

If an older practice question uses MSDS, recognize that it refers to the predecessor terminology for the modern SDS.

7. Do Not Memorize One Universal First-Aid Response

The exam may test basic frostbite concepts, but field first aid must be based on the actual exposure.

Especially remember:

Frozen / frostbitten skin
→ do not rub
→ do not flush frozen tissue with water
→ do not remove clothing frozen to tissue
→ seek immediate medical attention

and:

Eye tissue frozen
→ immediate medical attention

Eye tissue not frozen
→ flush thoroughly with water for at least 15 minutes
→ follow SDS and obtain medical attention as indicated

8. PPE Does Not Replace Safe Procedure

Correct PPE does not authorize:

• Intentional refrigerant release.
• Careless hose disconnection.
• Work outside manufacturer pressure limits.
• Entry into a dangerous atmosphere.
• Ignoring the SDS.

Common Mistakes and Confusing Points

Mistake 1: Assuming “Low Toxicity” Means “No Hazard”

A refrigerant can have relatively low toxicity and still create serious:

• Frostbite.
• Eye injury.
• Pressure-release hazards.
• Asphyxiation risk.
• Fire or decomposition hazards depending on refrigerant.

Safety classification is covered in Section 6.4.

Mistake 2: Treating Ordinary Eyeglasses as Refrigerant PPE

Ordinary prescription eyewear is not automatically approved protective eyewear.

Use eye protection appropriate to the hazard.

Mistake 3: Using a Face Shield as the Only Eye Protection

A face shield provides additional face coverage but does not automatically replace primary eye protection.

Mistake 4: Assuming Any Work Glove Is Adequate

Glove selection depends on:

• Chemical compatibility.
• Temperature.
• Task.
• Duration.
• Dexterity.
• Other hazards.

Use the SDS and hazard assessment.

Mistake 5: Removing PPE Too Early

A large fraction of the main refrigerant may already be recovered, but trapped refrigerant may remain in:

• Hoses.
• Manifold passages.
• Recovery-equipment connections.
• Cylinder fittings.

Keep the required PPE in use until the task is safely completed.

Mistake 6: Calling Every Refrigerant Contact a “Chemical Burn”

Some refrigerant injuries are primarily freezing injuries caused by rapid heat removal.

Other exposures may involve chemical irritation or contaminated oil.

Correctly identifying the exposure matters because first aid can differ.

Mistake 7: Rubbing Frostbitten Skin

Do not rub frostbitten tissue.

Current NIOSH guidance calls for immediate medical attention.

Mistake 8: Flushing Frozen Skin With Water

Do not apply a generic “flush everything with water” rule to frozen tissue.

Current NIOSH guidance specifically says not to flush frostbitten skin with water.

Mistake 9: Pulling Clothing Away From Frozen Tissue

Do not remove clothing that is frozen to frostbitten tissue.

Obtain medical attention.

Mistake 10: Assuming Every Eye Exposure Is Handled Identically

NIOSH distinguishes:

• Frozen eye tissue → immediate medical attention.
• Non-frozen eye tissue → immediate, thorough water flushing for at least 15 minutes.

Always check the product SDS.

Mistake 11: Looking at the SDS Only After an Accident

The SDS should be reviewed before work begins.

The technician should already know:

• The hazards.
• PPE.
• First-aid measures.
• Emergency procedures.

Mistake 12: Treating the SDS as a Substitute for Equipment Instructions

The SDS explains the chemical.

The equipment manufacturer explains the appliance and service procedure.

Safe service may require both.

Concept-Check Questions

Question 6.1-1

Why can escaping liquid refrigerant cause frostbite?

A. It always reacts chemically with skin to form ice.

B. Rapid vaporization absorbs heat from the exposed tissue.

C. Refrigerant increases the blood pressure inside the skin.

D. The cylinder transfers electrical current through the refrigerant.

Question 6.1-2

Which source should a technician use to find product-specific first-aid instructions for refrigerant exposure?

A. The compressor nameplate only

B. The building thermostat instructions

C. SDS Section 4

D. The recovery-cylinder tare-weight marking

Question 6.1-3

Which SDS section is the primary location for exposure controls and personal-protection information?

A. Section 2

B. Section 4

C. Section 8

D. Section 16

Question 6.1-4

A task presents a significant refrigerant splash hazard to the face. Which statement is most accurate?

A. A face shield automatically replaces all primary eye protection.

B. Appropriate primary eye protection should be used, with a face shield added when the hazard requires additional face protection.

C. Ordinary prescription glasses provide the same protection as chemical-splash goggles.

D. Eye protection is unnecessary when gloves are worn.

Question 6.1-5

A technician’s skin has been frostbitten by a refrigerant release. Which action best matches current NIOSH first-aid guidance?

A. Rub the frozen area vigorously to restore circulation.

B. Flush the frostbitten tissue continuously with cold water.

C. Pull away any clothing frozen to the tissue.

D. Do not rub or flush the frozen tissue with water, do not remove clothing frozen to it, and seek medical attention immediately.

Question 6.1-6

Liquid refrigerant enters a technician’s eye, but the eye tissue is not frozen. According to the general NIOSH eye-frostbite first-aid procedure, what immediate action is appropriate?

A. Flush the eye thoroughly with large amounts of water for at least 15 minutes and follow the SDS / medical guidance.

B. Keep the eye closed for one hour without rinsing.

C. Rub the eyelid until the refrigerant evaporates.

D. Apply refrigerant oil to the eye to prevent drying.

Question 6.1-7

Which statement about protective gloves is most accurate?

A. Any leather work glove is acceptable for every refrigerant and every service task.

B. Gloves are required only when refrigerant is known to be toxic.

C. Glove selection should consider the task, refrigerant, chemical and temperature hazards, duration, and manufacturer/SDS recommendations.

D. Gloves eliminate the need for careful hose-disconnection procedures.

Question 6.1-8

Which statement best describes the relationship between an SDS and equipment manufacturer instructions?

A. The SDS replaces all appliance service instructions.

B. Manufacturer instructions replace the need to review refrigerant hazards.

C. The SDS addresses the chemical/product hazards, while manufacturer instructions address appliance-specific service procedures; both may be required.

D. Neither is necessary after a technician has passed the Section 608 examination.

Section Summary

The essential safety sequence for direct refrigerant exposure is:

Identify the refrigerant
→ review the SDS
→ review manufacturer instructions
→ evaluate the task hazards
→ select correct PPE
→ control pressurized connections
→ perform the work safely

The most important direct-contact concepts are:

• Escaping liquid refrigerant can remove heat rapidly and cause frostbite.
• Protect the eyes and skin.
• Use gloves appropriate to the refrigerant, temperature, task, and duration.
• Use chemical-splash goggles when splash protection is required.
• A face shield is additional protection and does not automatically replace primary eye protection.
• Review SDS Section 4 for first aid.
• Review SDS Section 8 for exposure controls and PPE.
• Follow the refrigerant-specific SDS rather than assuming every exposure is treated identically.
• Do not rub frostbitten skin.
• Do not flush frozen skin with water.
• Do not remove clothing frozen to frostbitten tissue.
• Frozen eye tissue requires immediate medical attention.
• Non-frozen eye tissue exposed to a chemical should be flushed according to the applicable first-aid guidance; NIOSH’s general eye-frostbite procedure specifies at least 15 minutes of thorough water flushing when the eye tissue is not frozen.
• Manufacturer instructions and the SDS serve different purposes and should both be available before service.

The next section develops the hazards created when refrigerant vapor accumulates in an occupied or confined space.

See Section 6.2 - Respiratory and Confined-Space Hazards.

References

Current Official Safety and Examination Sources

1. U.S. Environmental Protection Agency, Test Topics — Section 608 Technician Certification, Safety topic including refrigerant-exposure risks, frostbite, gloves, goggles, and self-contained breathing apparatus in extreme cases. Accessed August 10, 2026.

2. Occupational Safety and Health Administration, Personal Protective Equipment — Overview, PPE hazard assessment, selection, use, maintenance, and training. Accessed August 10, 2026.

3. Occupational Safety and Health Administration, 29 CFR 1910.132 — General Requirements for Personal Protective Equipment, workplace hazard assessment and selection of PPE. Accessed August 10, 2026.

4. Occupational Safety and Health Administration, 29 CFR 1910.133 — Eye and Face Protection, eye and face protection requirements. Accessed August 10, 2026.

5. Occupational Safety and Health Administration, 29 CFR 1910.138 — Hand Protection, selection of hand protection based on task, conditions, duration, and identified hazards. Accessed August 10, 2026.

6. Occupational Safety and Health Administration, 29 CFR 1910.1200 — Hazard Communication, Safety Data Sheet and chemical-hazard communication requirements. Accessed August 10, 2026.

7. Occupational Safety and Health Administration, 29 CFR 1910.1200 Appendix D — Safety Data Sheets, current SDS section content including first-aid measures and exposure controls/personal protection. Accessed August 10, 2026.

8. Occupational Safety and Health Administration, Hazard Communication Standard: Safety Data Sheets, explanation of the standardized SDS format and section purposes. Accessed August 10, 2026.

9. National Institute for Occupational Safety and Health, First Aid Procedures for Chemical Hazards, current NIOSH general first-aid procedures for eye frostbite, skin frostbite, washing, and medical attention. Accessed August 10, 2026.

EPA 608 Teaching Reference

10. International Training Institute for the Sheet Metal and Air Conditioning Industry, EPA Section 608 Study Guide, Core safety framework and glossary use of the older term Material Safety Data Sheet (MSDS).

HVAC Safety References

11. Rex Miller and Mark R. Miller, HVAC Licensing Study Guide, 3rd ed., basic safety discussion emphasizing safety glasses, work gloves, protective clothing, safety codes, and manufacturer instructions.

12. Rex Miller and Mark R. Miller, HVAC Licensing Study Guide, 3rd ed., refrigerant safety discussion of skin effects, cold injury, eye exposure, and protective clothing.

Project Cross-References

13. Section 3.6 - Moisture Acid and Noncondensables.

14. Section 5.4 - Recovery Preparation.

15. Section 6.2 - Respiratory and Confined-Space Hazards.

16. Section 6.3 - Fire Explosion and Decomposition Hazards.

17. Section 6.4 - Refrigerant Safety Classifications.