A factory-level sourcing guide to contact heat gloves for 100-350°C hot parts handling, covering EN 407:2020 contact heat levels, cotton terry and aramid liner choices, nitrile and silicone grip limits, MOQ, sampling, AQL inspection, Incoterms and export packing reality.
Start With Contact Time, Not a Heat Claim
Do not start a heat glove enquiry with heat resistant to 500°C. Start with the part temperature, the seconds of contact and the number of cycles per shift. A plastics moulding operator lifting a 180°C ABS housing for 6-8 seconds needs a different glove from a stamping worker holding a 320°C bracket for 15-20 seconds. The same EN 407 result can feel very different on a flat tray, a sharp ribbed casting or a thin metal edge under grip pressure. EN 407:2020 measures contact heat at level 1 for 100°C, level 2 for 250°C, level 3 for 350°C and level 4 for 500°C, using a 15 second threshold in the test method. That is a useful benchmark, not a production guarantee. A glove reaching contact heat level 3 does not mean a worker can comfortably clamp every 350°C part for 15 seconds all day. Moisture, compressed liner pile, burrs and repeated cycles push heat through faster than the lab plate. For quoting contact heat gloves, we ask for five details before naming a construction: maximum surface temperature, normal grip time, worst-case grip time, parts per hour and whether the surface is dry, oily or coated with release agent. If cut risk is present, EN 388:2016 plus A1:2018 is part of the spec; many hot stamped parts need cut level B or C as well as EN 407 contact heat.
Production Scope and Claim Limits
GloveMark develops knitted, dipped and sewn industrial heat gloves for normal plastics, tray, moulding and hot-parts handling. Our practical production range includes 7 gauge cotton terry, 7 gauge aramid terry, 10 gauge aramid blend, 13 gauge cut-resistant liners for lighter heat, nitrile foam, nitrile sandy, nitrile smooth, silicone dot or stripe print, split leather patches and extended knit or canvas cuffs. For most moulding lines, the working area is 100-350°C contact heat, not furnace radiant heat. The most common starting points are a 7 gauge cotton terry liner with nitrile palm for 100-250°C dry or slightly oily parts, and a 7 gauge or 10 gauge aramid blend liner with nitrile sandy or silicone print for higher temperature or longer wear life. Leather reinforcement at the thumb crotch and fingertips can help when workers drag parts from a mould or grip sharp sprues. It adds sewing labour and can stiffen the glove, so we do not add leather unless the failure point justifies it. We are not a primary foundry-glove producer for aluminised radiant heat gloves, molten metal splash gloves or EN 407 large molten metal splash levels 3-4. Pouring aluminium around 660°C, furnace doors, open flame and ladle work need specialist materials, stitching and test validation. If the hazard is flame, radiant heat or molten splash, the buyer must specify those EN 407 performance positions, not only contact heat.
Material Choices: Cotton, Aramid and Blends
Cotton terry is the cost-controlled choice for dry 100-250°C work such as bakery trays, powder coating hooks, warm moulded plastic parts and short handling of heated jigs. A 7 gauge cotton terry liner works because the loop pile traps air. The weaknesses are also clear: cotton chars more easily than aramid, loses insulation when wet, and flattens after washing or heavy compression. In inspection, we pay attention to pair weight and liner density because a lighter terry glove can pass a desk review and still fail in an 8 hour line trial. Aramid costs more but handles heat and abrasion better. Para-aramid brings strength and cut resistance. Meta-aramid improves thermal stability and does not melt like polyester. Some commercial designs use aramid on the outside with cotton or acrylic plaiting inside to reduce cost and improve comfort. This is acceptable if the buyer understands the trade-off; it is not the same as a full aramid terry glove. Glass fibre or stainless steel fibre can lift EN 388 cut performance, but the hand feel becomes harsher and flex fatigue can increase. For private-label development, we normally prototype two or three builds rather than arguing from a material list. A typical round is one 7 gauge cotton terry nitrile sample, one 7 gauge aramid terry nitrile sandy sample and one aramid blend with silicone print or leather reinforcement. The buyer should test them on the real part for grip time, part slippage, liner heat build-up and fingertip wear. Lab reports narrow the risk; they do not replace a line trial with the same part geometry and cycle rate.
Coatings Help Grip, but They Also Change Heat Behaviour
Palm coating is where many contact heat gloves become over-specified or unsafe. Nitrile improves oil resistance and grip on mould-release residue, and nitrile sandy gives better bite on rough or lightly oily parts than smooth nitrile. Nitrile foam can feel softer and more breathable, but the exact compound and thickness matter. A thick coating may protect the liner surface yet trap heat against the hand once warmed. PU is usually the wrong choice for real hot-parts handling because it softens and degrades earlier than nitrile in many 100-250°C contact jobs. Latex grips well on dry surfaces but performs poorly around oils and some additives. Silicone dots, bars or screen-printed grip patterns are useful for hot trays, glass, smooth plastic and dry parts where release cleanliness matters. Silicone generally handles higher surface heat than common PU or latex coatings, but it costs more and needs tighter process control. Dense silicone patterns can become stiff, while very small logos or decorative shapes may not print evenly on a looped terry surface. We do not recommend treating silicone print as branding artwork first; it is a grip and heat interface. Coverage should be named in the tech pack: palm coated, three-quarter dipped, full dipped, dot print, stripe print or patched. Full dip protects more of the hand but reduces breathability and can increase internal heat stress during a full shift. A single pair tested for two minutes on a manager’s desk tells very little about sweat, liner compression and coating wear.
Testing and Marking: What to Put on the Tech Pack
A usable tech pack should name EN ISO 21420 for general glove requirements, EN 388:2016 plus A1:2018 for mechanical risks and EN 407:2020 for thermal risks. For EN 407, ask for all six performance positions in order: limited flame spread, contact heat, convective heat, radiant heat, small molten metal splash and large molten metal splash. Untested items should be shown as X, not hidden. If the target is contact heat level 2 at 250°C, write that. If level 3 at 350°C is needed, write the required contact duration and the part shape as well. For EU PPE Category II or Category III products, CE marking is not a sticker exercise. The importer needs the correct technical file, user information, Declaration of Conformity and notified body involvement where required. UKCA has its own documentation route. Production inspection is physical and should be written into the order. Normal export inspection terms are AQL 2.5 for major defects and AQL 4.0 for minor defects unless the buyer sets stricter limits. Heat gloves often fail because the coating is thin at the thumb crotch, cuffs are 10-15 mm short, or left and right hands do not match in weight.
MOQ, Sampling, Lead Time and Landed Cost Reality
For an existing contact heat glove construction with a private cuff label, printed header card or carton mark, a realistic MOQ is usually 1,200-3,000 pairs per colour and size mix. For new aramid yarn, custom silicone tooling, special long cuffs or sewn leather reinforcement, 5,000 pairs is more realistic because yarn purchasing, machine setup, coating trial loss and inspection sorting all increase. If the buyer wants five sizes from XS to XXL, the MOQ must cover each size properly; otherwise the factory ends up knitting inefficient small lots. Sample development normally takes 10-18 days after the tech pack is clear and yarn is available. Bulk production is commonly 35-55 days after sample approval and deposit. Third-party EN 407 or EN 388 testing can add 2-4 weeks depending on the lab queue and whether the first submitted construction passes. A failed lab result means changing the glove, not changing the report. Price depends mainly on fibre content, liner weight, coating type, cuff length, reinforcement and packaging. A cotton terry nitrile glove sits in a much lower band than an aramid terry glove with silicone grip and split leather thumb reinforcement; it is normal for the aramid build to cost several times more. Heat gloves are bulky. A 40 ft HC container may cube out long before it reaches weight, especially with 7 gauge terry liners and long cuffs. Carton dimensions, pairs per carton and compression limits affect landed cost more than many buyers expect. For smaller trial orders, LCL freight can make the per-pair landed cost look ugly, but it is still cheaper than ordering 10,000 pairs of the wrong glove.
Confirm the specification in writing
Use this article as a starting point. Ask GloveMark for written, project-specific confirmation of materials, MOQ, pricing, sample policy, certification scope and lead time before placing an order.
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