Heat resistant gloves protect hands from four distinct thermal hazards: contact heat, radiant heat, flame, and sparks. No glove is fireproof. Ratings under ANSI/ISEA 105-2024 and EN 407 describe how long a material resists a specific heat exposure, so the right choice starts with the hazard, its temperature, and its duration.
That is the honest version of an answer most glove marketing refuses to give. At CACO America we supply high-heat PPE to distributors in more than 38 countries, and I have watched buyers order on adjectives for over 30 years, since I joined our family business in 1992. This guide replaces the adjectives with the ratings, the materials, and a simple matching method.
"Fireproof gloves" do not exist
Thousands of people search for fireproof gloves and heat proof gloves every month, and the products they find are neither. Every glove on the market is heat resistant and flame resistant for a rated exposure. Nothing is heat proof. Hold an aramid glove against a 500°C surface long enough and heat gets through. Keep leather in a flame and it eventually chars, stiffens, and fails.
We covered the same pattern with cut protection in our guide to cut resistant gloves, where "cut proof" is the seductive lie. Heat is no different. A rating buys time at a temperature, never immunity.
This matters because a worker who believes his gloves are fireproof holds the hot part longer. Sell and spec the honest version: this glove resists this exposure for this long.
The four thermal hazards, and why one glove cannot cover all of them
Heat reaches a hand four different ways, and each route defeats a different design.
- Conductive heat (contact).Gripping a hot casting, mold, or exhaust manifold. Insulation thickness does the work here.
- Radiant heat.Standing near a furnace or molten metal without touching anything. Only a reflective surface turns this energy away; bulk alone soaks it up.
- Flame contact.Direct flame demands fibers that resist ignition and stop burning when the flame leaves.
- Sparks and spatter.Welding and grinding throw hot droplets that must roll off before they burn through, which is a surface property, not an insulation property.
A terry knit that shines at contact heat can catch spatter in its loops. An aluminized glove that blocks radiant heat may offer modest grip on hot parts. Spec the hazard first, then the glove.
What ANSI/ISEA 105-2024 actually rates for heat
The North American hand protection standard, ANSI/ISEA 105-2024, is best known for cut levels, but it classifies heat performance too. Per the International Safety Equipment Association, the standard addresses ignition resistance, burning behavior, heat degradation, and conductive heat resistance. In plain language: does the glove catch fire, how does it burn if it does, does high heat break the material down, and how well does it slow heat passing through to the hand.
What the public ISEA pages do not publish is a consumer-facing temperature ladder for heat the way the A1 to A9 scale works for cut. Manufacturers report thermal performance from the test data, so on a North American spec sheet you should expect named properties and test results rather than one universal heat number. When a supplier quotes you a simple "rated to X degrees" claim with no standard attached, ask which test produced it.
EN 407: where the temperature numbers come from
The European standard for thermal risks, EN 407, is where clear temperature levels live, and its markings appear on many gloves sold in the US. EN 407 covers six separate tests: limited flame spread, contact heat, convective heat, radiant heat, small splashes of molten metal, and large quantities of molten metal, as summarized in HexArmor's EN 407 breakdown.
The contact heat scale is the number buyers use most. A glove earns level 1 at 100°C (212°F), level 2 at 250°C (482°F), level 3 at 350°C (662°F), and level 4 at 500°C (932°F). At each level the inside of the glove must rise no more than 10°C during 15 seconds of contact. Read that fine print again: the rating certifies 15 seconds, not a shift. PIP's comparison of ASTM F1060 and EN 407 confirms the same fixed test temperatures.
Materials: what each one is actually good at
Four material families cover most of the high-heat glove market, and each maps to a hazard.
- Thick split or grain leather insulates against moderate contact heat, sheds sparks and spatter, and survives abrasion. It is the backbone of our leather gloves range and of most welding designs.
- Aramid fiber.The Kevlar and Nomex family. Aramids resist ignition, char rather than melt, and keep strength at temperatures that destroy common synthetics. Never melt-drip like nylon or polyester.
- Terry cloth knit.Looped cotton or blended terry traps air, and trapped air is insulation. Terry blocks and mitts are the quiet workhorses of bakeries, molding plants, and appliance lines.
- Aluminized fabric.A mirrored surface bonded to a fabric back reflects radiant heat away before it soaks in. This is the only family built for standing near molten metal and furnace openings.
Notice what is missing: universal temperature ceilings. Honest suppliers rate a finished glove, not a raw material.
Matching the glove to the task
Here is the matching method we coach, one hazard at a time.
| Thermal Hazard | Typical Glove or Material | What to Check Before You Buy |
|---|---|---|
|
Contact Heat Castings, molds, ovens |
Terry knit, heavy leather, felt-lined gauntlet | Check the EN 407 contact heat level against your part temperature and required hold time. |
|
Radiant Heat Furnaces, molten metal |
Aluminized back with insulating liner | Check the radiant heat rating and pair gloves with appropriate face and body protection. |
| Flame Contact | Aramid blend or treated leather | Check the flame spread rating. The material should char rather than melt. |
|
Sparks & Spatter Welding, grinding |
Grain or split leather gauntlet | Consider cuff length, seam placement, and spatter shedding when selecting the glove. |
|
Mixed Heat + Cut Glass handling |
Aramid and HPPE blend knit | Verify both the heat rating and the applicable ANSI cut-resistance level. |
Foundry and casting crews usually need contact plus radiant protection, so they layer aluminized shells over knit liners. Glass plants combine heat with sharp edges, which is why glass gloves blend aramid with cut-resistant yarns. Exhaust and engine work is short-contact heat, where a level 2 or level 3 contact rating with real dexterity beats a clumsy mitt. And welding deserves its own spec, which we wrote up in our leather welding gloves guide, because arc processes add spatter, UV, and flame to the mix. OSHA's hand protection rule, 29 CFR 1910.138, puts the duty plainly: employers must select gloves based on the hazards present. Thermal burns sit inside a category federal data tracks closely. Over 2023 and 2024 combined, exposure to harmful substances or environments, the event family that includes temperature extremes, produced 224,450 cases involving days away, restriction, or transfer in private industry, and 87.6 percent of them cost at least one day away from work, per the Bureau of Labor Statistics release of January 2026.
The wet glove trap
One practical warning belongs in every heat glove conversation: a wet glove transmits heat far faster than a dry one. Water fills the air pockets that make insulation work, and hot surfaces flash that moisture to steam inside the glove, which can scald skin at temperatures the dry glove would have shrugged off.
The field rules are simple. Never grab hot material with a damp glove. Keep a dry rotation pair at any station where gloves meet sweat, quench tanks, or washdown. And treat a soaked glove as out of service until it dries fully, inside and out. The same physics applies to oil and coolant soaking into leather.
Sizing, liners, and layered systems
High-heat hands are usually layered systems, not single gloves. A knit liner under a leather or aluminized shell adds an insulating air gap, wicks sweat away from the skin, and lets crews launder the layer that gets dirty. Some operations run glove-over-glove on purpose, sizing the shell a half size up to make room.
Fit still matters at temperature. A glove that is too tight compresses its insulation and puts the hand closer to the heat. A glove too loose gets pulled off by tongs and part edges. Order a sizing run for trials, the same way you would for general purpose gloves, and let workers test with the actual parts they handle.
When to replace heat resistant gloves
Heat kills gloves slowly, then suddenly. Retire a pair when you see any of these signs.
- Leather that has hardened from repeated heat cycles has lost the oils that kept it insulating and flexible.
- Surface cracks open pathways for heat, sparks, and steam.
- Char, glazing, or shiny spots.Burned or glazed patches mean the material has already degraded at that point.
- Thin or crushed insulation.Compressed terry loops and matted liners no longer hold the air gap that did the protecting.
- Oil-soaked leather conducts heat faster and can itself ignite.
Inspection before every shift costs nothing. A burned hand costs a claim, and the hand protection budget of several years.
"A buyer who tells me the part temperature and the hold time gets the right glove in one conversation. A buyer who asks for the toughest heat glove we carry gets a question back, because that request has no answer." - Joel Abbo, CEO, Caco Abbo Group
For distributors: heat gloves are a spec sale
If you distribute PPE, heat protection is where a rep earns trust fastest, because the category punishes guessing. Sell by hazard temperature and duration, never by adjective.
- Ask three questions on every quote.What is the surface temperature? How long is the hold? Is the heat contact, radiant, flame, or spatter? Those answers spec the glove for you.
- Stock by hazard, not by keyword.A bin of terry blocks, a leather gauntlet program anchored by welding gloves, an aramid blend for mixed heat and cut work, and one aluminized SKU for radiant accounts covers most territories.
- Put ratings on the shelf tag.An EN 407 contact level and a plain-English task line close faster than a brand name, the same market logic we laid out in navigating the safety gear market.
- Bundle the dry-rotation pitch.Two pairs per worker with a drying cadence sells more units and prevents the steam injuries that end programs.
We built CACO America to back this motion. We hold the exclusive GE PPE license for the Americas and the Caribbean, so our GE PPE line gives distributors a recognized name at working prices, stocked alongside the broader safety catalog and the most in-demand safety products of 2026. Heat protection rewards the distributor who talks in degrees and seconds.
Frequently Asked Questions
1. Are any gloves actually fireproof?
No. Fireproof gloves do not exist. Every glove is heat resistant and flame resistant for a rated exposure, meaning it slows heat transfer or resists ignition for a tested time at a tested temperature. Given enough heat or enough seconds, any material fails. Treat "fireproof" on a listing as a marketing claim, and ask which standard and test level sits behind it.
2. What temperature can heat resistant gloves handle?
It depends on the glove's rating, not the material name. Under EN 407, contact heat levels run from level 1 at 100°C to level 4 at 500°C, and each level certifies only 15 seconds of contact with no more than a 10°C rise inside the glove. Longer holds need a higher level, an insulating liner, or a tool between hand and part.
3. What does ANSI/ISEA 105-2024 say about heat?
The standard classifies four thermal properties: ignition resistance, burning behavior, heat degradation, and conductive heat resistance. Unlike its A1 to A9 cut scale, ISEA's public materials do not publish a single consumer temperature ladder for heat, so North American spec sheets report performance by property and test. Many gloves sold in the US carry EN 407 markings for temperature levels.
4. What are the best glove materials for high heat?
Match the material to the hazard. Heavy leather and terry cloth knit insulate against contact heat and shed sparks. Aramid fibers such as Kevlar resist ignition and char instead of melting. Aluminized fabric reflects radiant heat from furnaces and molten metal. For mixed heat and cut hazards, like glass handling, aramid blends with cut-resistant yarns cover both ratings.
5. Are welding gloves the same as heat resistant gloves?
Welding gloves are one branch of heat protection, tuned for spatter, flame, and short contact rather than long holds on hot parts. A MIG or stick gauntlet sheds droplets and blocks radiant arc heat, but a foundry crew holding castings needs contact-heat insulation instead. Spec them separately, and size welding cuffs to cover the jacket sleeve.
6. Why do wet gloves burn hands faster?
Water displaces the air trapped in the glove's insulation, and water conducts heat far better than air. Against a hot surface, that moisture can flash to steam inside the glove and scald the hand at exposures a dry glove would resist. Keep a dry backup pair at hot stations and never handle hot material with a damp glove.
7. What heat protection should distributors stock?
Cover the four hazards with four anchors: terry or felt-lined gloves for contact heat, leather welding gauntlets for sparks and flame, an aramid blend for mixed heat and cut work, and an aluminized style for radiant accounts like foundries and glass plants. CACO America supplies distributors at wholesale with fast US shipping and spec support on every quote.
Spec the hazard, then stock it
Heat protection is the easiest category to sell honestly, because the physics does the selling. Bring us the part temperatures and hold times your accounts deal with, and we will help you build a heat glove program around them, backed by a team that has lived PPE since 1992. Start at become a distributor or browse the range at cacoamerica.com.
