How to Compare Dielectric Gloves by Class and Test Voltage?

Founded in 1956, PPEMAX stands as a premier global manufacturer and supplier of full-range personal protective equipment. All our products comply with internationally recognized standards including IEC, ASTM, CE, UKCA, NIOSH and ISO9001. Equipped with a 2,000-square-meter modern production plant, we boast over 25 years of mature OEM & ODM capabilities to deliver one-stop customized solutions covering R&D design through worldwide logistics. Our safety gear is distributed across 134 countries globally. Upholding our core tenet “Safety First, Quality Priority”, we serve as a dependable long-term PPE partner for industrial enterprises around the world.

​​​​​​​

Comparing dielectric gloves by class and test voltage means matching each glove's rated maximum use voltage to the actual electrical hazard in your workplace. The classification system runs from Class 00 (500V AC maximum use) through Class 4 (36,000V AC maximum use), with each step requiring a higher proof test voltage under ASTM D120 or EN 60903. I recommend starting with a site voltage assessment, then cross-referencing your measured hazard voltage against the appropriate glove class. This process keeps workers protected and keeps your procurement compliant with OSHA electrical safety regulations.

Understanding Dielectric Gloves and Their Classification

Before you compare classes, it's helpful to know how these gloves work and what the standards are for each level.

What Are Dielectric Gloves?

Electrical insulating gloves, also known as dielectric gloves, are made from natural rubber or EPDM (Ethylene Propylene Diene Monomer). They stop current from flowing from an electric source to the person wearing them. EPDM is better at resisting ozone and UV damage, which makes it the best material for outdoor utility work. Natural rubber is more flexible and dexterous. Before every shift, the color-coded interior and exterior layers make it easy to check for holes or other damage.

The Class System: Class 00 to Class 4

ASTM D120 defines six protection classes. This is how it breaks down:

These numbers come straight from ASTM D120 and are also used in EN 60903 for European markets. This gives buying teams around the world a uniform point of reference.

Type I vs. Type II and Key Certifications

Type I dielectric gloves are made from natural rubber and can't stand up to ozone. Type II gloves are made of synthetic materials like EPDM and don't crack when exposed to ozone, which is very important for workers who work outside. Both types have to pass tests for dielectricity, tensile strength, and resistance to punctures. You should look for certifications like EN 60903 (Europe) and ASTM D120 (North America). 29 CFR 1910.137 by OSHA also requires certain performance standards, so when buying something, confirmed certification paperwork is something that can't be changed.

Key Factors to Compare When Selecting Dielectric Gloves

Picking the right glove class is just one part of the choice. Several performance factors show how well a glove works in real-life field conditions.

Test Voltage vs. Working Voltage

The proof test voltage of a glove is always higher than its maximum use voltage. This extra voltage is there to protect against wear and tear, small surface damage, and environmental stress. Always choose a class that is rated at least one level higher than the voltage you know will work. For instance, if your outlet runs on 15,000V AC, the least you should choose is a Class 2 glove that is rated to 17,000V and tested to 20,000V.

Temperature Tolerance and Waterproof Performance

Electrical insulating gloves need to be able to keep their dielectric strength at different temperatures. When it gets below -10°C, natural rubber gloves can get stiff, which could make it harder to grip and move your fingers. Most of the time, EPDM products work better when they are cold. In terms of wetness, dielectric gloves do keep their insulating properties when they are wet on the outside. However, insulation is lost when water gets inside the glove. Before each use, workers should check the inside for moisture.

Durability, Inspection, and Re-Testing Requirements

OSHA requires that gloves that are being used be re-tested for electricity every six months. Rolling the cuff to trap air and checking for leaks should be part of the daily air inflation test that you do before every use. In the field, you should always wear leather protective gloves over rubber insulation gloves to keep your hands from getting damaged. Cracks in the ozone layer, contaminants embedded in the material, and chemical breakdown should all be visible to the naked eye. Put gloves in canvas bags with the cuffs facing down. Keep them somewhere cool, dark, dry, and away from sources of ozone.

If you're evaluating personal protective equipment suppliers and require batch-specific testing documents before placing an order, PPE MAX is able to provide official Certificates of Analysis, professional laboratory test reports, and product samples for your verification. Feel free to contact our team at marketing@ppemax.com to discuss your sourcing needs and obtain complete documentation for your quality assessment and procurement approval.

Comparing Dielectric Gloves by Class and Test Voltage: Practical Steps

A structured selection process reduces procurement errors and keeps your safety program audit-ready.

Step 1 — Assess Workplace Voltage and Risk Level

Begin by documenting the maximum voltage present at each work area. Include both AC and DC exposures, since DC ratings differ from AC — ASTM D120 proof test values for dielectric gloves are approximately 1.5 times the AC values. Consult your electrical engineers or site safety officers for verified voltage data before specifying any glove class.

Step 2 — Match Glove Class to ASTM Benchmarks

Once you have confirmed working voltages, map each task to the appropriate glove class using the table in the section above. For EV battery service work involving high-capacity DC packs, Class 0 or Class 00 gloves are standard. For overhead line repairs and transformer servicing at utility voltages, Class 2 or Class 3 gloves are widely used by linemen.

Step 3 — Evaluate Ergonomics and Supplier Credentials

Prolonged use demands anatomical "curved-hand" designs that reduce hand fatigue during extended tasks. Wrist length and cuff design affect protection coverage. Verify that suppliers provide valid third-party test reports, not just self-declarations. Request sample gloves and inspect certification markings before placing bulk orders. Established dielectric glove manufacturers with documented ASTM and EN 60903 compliance records offer greater procurement reliability than unverified sources.

Dielectric Gloves Comparison: Common Market Options and Their Features

Knowing what choices are out there helps procurement teams make data-based decisions about where to get things.

Reusable vs. Disposable Options

For high-voltage industry uses, reusable rubber insulation gloves are still the norm. They can be cleaned with light soap and water (not hotter than 49°C/120°F), dried completely, and put back into service after a check shows they are safe to use. To do very low-voltage jobs, you can use disposable or one-time-use electrical gloves, but they don't meet ASTM D120 standards for the class system. For medium-sized to large businesses that deal with repeat customers, reusable gloves save more money over time.

Natural Rubber vs. EPDM: Material Comparison

Because they are so flexible and sensitive to touch, natural rubber gloves are best for doing precise work in small areas, like fixing EV powertrains. EPDM gloves, on the other hand, are better at protecting against ozone cracking and UV exposure, which is useful for outdoor utility repair where the environment is always present. Both products meet ASTM D120 when they are made correctly, but the one that is best for the job relies on the conditions.

Top Application Scenarios and Glove Matching

In industrial settings, people buy dielectric gloves for these three main reasons:

• Utility Power Grid Maintenance: Linemen working on overhead lines and transformer banks require Class 2 or Class 3 gloves, where exposure to high-voltage AC is constant and physical abrasion from equipment surfaces is a daily reality.
• EV Manufacturing and Battery Repair: Technicians handling high-capacity DC battery packs and drive systems select Class 0 or Class 00 gloves for precision movement in tight assembly or service spaces.
• Industrial Substation Operations: Maintenance engineers operating switchgear and circuit breakers pair Class 2 gloves with leather protectors to guard against arc flash and incidental contact with energized components.

For each situation, you need gloves that can work with water, hydraulic fluids, and mechanical stress all at the same time.

Making the Purchase: Where and How to Buy Dielectric Gloves

Long-term operational costs and worker safety are both affected by strategic buying choices.

Procurement Channels for B2B Buyers

Most of the time, B2B buying teams get their PPE from approved wholesalers, direct maker partnerships, or confirmed trade platforms. Large companies have more control over specs, labeling, and quality paperwork when they work directly with manufacturers, especially those that can do OEM/ODM. Companies that do business in more than one country can avoid having to handle separate regional compliance audits by working with a supplier who knows both ASTM D120 and EN 60903.

Pricing Factors and Bulk Purchasing Strategy

Unit prices are affected by the amount of certification, the type of material, and the class of the glove. Because they have to pass stricter tests and have thicker insulating layers, Class 4 gloves cost a lot more than Class 00 gloves. Ask for different levels of volume pricing, sample shipments so you can approve the product before it goes into production, and documentation packages with test certificates and material safety data when you are negotiating bulk orders. Before signing any supplier deal, especially for government and infrastructure contracts, make sure the paperwork meets OSHA standards.

Verifying Compliance Before Committing

Always ask for the real ASTM or EN test results, not just a statement of conformity. Check the test date because OSHA requires re-testing every six months. You shouldn't have any safety gloves that have outdated approval. Check the supplier's quality control methods for production, such as their methods for checking tensile strength, tear resistance, and leakage current.

Conclusion

Knowing your workplace's voltage is the first step in choosing the right class of dielectric gloves. Checking your supplier's certifications is the last step. Categories in the ASTM D120 system, ranging from Class 00 at 500V to Class 4 at 36,000V, make things easy for procurement teams to understand and measure. The long-term performance of protection depends on the type of material used, how often it is tested, and how well it fits the user. The safest and most cost-effective way to buy gloves is to match the right class to the right danger. This is true whether you are in charge of a utility staff, an EV production center, or a big industrial substation.

FAQ

How often do dielectric gloves need to be electrically re-tested?

No matter how recently a glove was certified, it must be taken out of service, retested, or replaced if it shows visible damage, goes through a suspected chemical exposure, or fails the daily air inflation test at any point.

What voltage levels do these gloves actually protect against?

The class has a direct effect on the protection. Class 00 is for 100V AC or less; Class 4 is for 36,000V AC or more. All the time, the proof test voltages are higher. For example, 40,000V AC is used to test Class 4. As stated on the back of the glove, workers should never go over the maximum use voltage. When figuring out their risk, they should also always include voltage spikes or sudden energization.

Can dielectric gloves be used safely in wet conditions?

When the outside of a properly rated insulation glove gets wet, it still has its dielectric qualities. The problem is wetness inside the glove; if water gets inside, it loses a lot of its protective power. Workers should do the air expansion test and check the inside for moisture before each use. When working in the field, leather protectors worn over the rubber gloves also help when the ground is wet.

What is the difference between Type I and Type II gloves?

Type I gloves are made from natural rubber and can't stand up to ozone. Type II gloves are made of man-made materials like EPDM that don't break down in UV light or ozone. When used outside for utility purposes where ozone exposure is steady, Type II is the more durable and long-lasting choice.

Source Your Dielectric Gloves Supplier Through PPE MAX

Electrical safety equipment that has been certified by PPE MAX has been sold to businesses in 134 countries since 1956. As a reliable company that makes dielectric gloves, we make insulating gloves that meet ASTM D120 standards for all protection classes, from Class 00 to Class 4. We can do both OEM and ODM production for global brands and distributors. Our team tests the gear we make, and our documentation meets OSHA and the rules for buying things in other countries. To get examples, detailed specs, or a bulk price quote right away, email us at marketing@ppemax.com.

References

1. ASTM International. ASTM D120: Standard Specification for Rubber Insulating Gloves. ASTM International, 2021.

2. Occupational Safety and Health Administration (OSHA). 29 CFR 1910.137: Electrical Protective Equipment. U.S. Department of Labor, 2019.

3. International Electrotechnical Commission. IEC 60903: Live Working — Gloves of Insulating Material. IEC, 2014.

4. National Fire Protection Association. NFPA 70E: Standard for Electrical Safety in the Workplace. NFPA, 2021.

5. Cadick, J., Capelli-Schellpfeffer, M., & Neitzel, D. Electrical Safety Handbook. McGraw-Hill, 2012.

6. American National Standards Institute. ANSI/ISEA 105: American National Standard for Hand Protection Selection Criteria. ISEA, 2016.