High-temperature work is the one protective clothing category where “more protection” is regularly the wrong answer. The reason is that heat does not arrive one way. Radiant heat from a furnace mouth, convective heat from a flame, contact heat from a hot part and molten metal splash each transfer energy into a garment by a different mechanism, and a fabric engineered for one of them can underperform badly on another while looking identical on a spec sheet.
Name the heat source first. Everything after that is arithmetic.
Radiant, convective, contact and molten are separate specifications
Heat protective clothing is tested against the mechanism it will meet, so the first question is not “how hot” but “how is the heat arriving”.
Radiant heat comes off a hot surface without contact and is answered by reflectivity or by insulation that slows transmission. Convective heat arrives with moving air or flame and is answered by fabric structure and thickness. Contact heat transfers directly from a hot object and is answered by thermal resistance under load. Molten splash adds mass, adhesion and the possibility that the metal sticks and keeps delivering energy to one spot. A garment tested for radiant heat is not a substitute for one tested against molten splash. Read heat protective clothing levels: radiant, convective and contact heat and heat protective clothing types, ratings and selection.
Reflective aluminium and FR fabric are not competing products
Aluminium foil garments bounce radiant heat away before it reaches the body; FR hoods and garments absorb and resist. They are suited to different heat types, not different price points.
The reflective approach wins against a strong radiant load — a furnace door, a hot billet, an open tap hole — because the energy never has to be absorbed in the first place. It loses where the exposure is contact, molten splash or flame, because a reflective surface that is touched or coated stops reflecting. The FR approach handles flame and convective exposure and stays wearable for longer. The decision is a task-level one, and the same crew often needs both. Read aluminium foil hoods versus FR hoods, chosen by heat type, how reflective heat protective clothing works and where aluminium foil hoods are used.
Molten metal is its own test, and its own failure mode
Molten splash delivers both thermal energy and weight, and the garment has to survive the metal sticking to it rather than shedding it.
This is the exposure that separates a good specification from a plausible one. A fabric that performs well against radiant heat can fail here because the metal adheres, holds its energy in one place and burns through. Coating, weave and the way the garment sheds the material all matter, and the standard a supplier cites should be the molten metal test, not a general heat test. Read molten metal splash body protection across foundries, steel mills and glass furnaces and molten metal splash protection: standards and gear.
Face and head take the front of the exposure
Furnace work puts the face, neck and scalp directly in the radiant path, and the visor, frame and support all have to be rated for that heat source.
The common failure is a face shield chosen for impact and then used in a radiant setting, where the visor softens, distorts or transmits heat it was never tested against. The second failure is coverage: a shield that protects the eyes but leaves the neck and the gap under the helmet open. Read furnace face shields: radiant heat and molten metal face protection, what a furnace face shield and heat protection system has to cover, and head and face protection for foundry and furnace shutdown work.
Gloves: molten splash and hot contact are different tasks
High-temperature gloves are specified by heat source, because contact heat, radiant heat and molten splash each need a different construction.
A glove on a hot part needs thermal resistance under pressure. A glove near a furnace needs radiant reflection or insulation with a cuff that keeps the exposure off the forearm. A glove handling molten splash needs to shed material and survive adhesion. Buying one glove for the whole plant usually means under-protecting the worst task and over-paying for the rest. Read hand protection for molten metal splash and hot contact tasks and high temperature gloves: types, ratings and selection.
Steel mills, foundries and glass furnaces differ
The three reference environments for molten metal do not carry the same hazard profile, and the clothing requirement follows the difference rather than a shared category.
Steel mills combine radiant heat, molten splash and heavy contact in the same space, so garments are specified against several mechanisms at once. Foundries add refractory dust and shutdown work in confined spaces. Glass furnaces load the radiant side harder and change the splash behaviour. Read thermal protective clothing for steel mills and compare the three in molten metal splash body protection compared.
Questions buyers ask before they order
How hot can this clothing take?
Temperature alone is not a specification. The rating depends on how the heat arrives, how long the exposure lasts and what the garment is tested for. A single “maximum temperature” claim without a mechanism and a test method is not something to build a programme on.
Can aluminium foil clothing be used for molten splash?
Only where it is rated for that exposure. Reflective garments are built for radiant heat. Molten splash requires a fabric tested against molten metal, where adhesion and mass matter as much as temperature.
Do furnace crews need a full suit or can they layer?
The right answer follows the task and the exposure duration. Short, high-intensity exposures and long, lower-intensity ones produce different specifications, which is why the same furnace floor often needs more than one garment.
Does heat protection clothing also protect against flame?
Not necessarily, and the assumption causes real injuries. Check the standard cited on the garment: EN ISO 11612 performance codes and molten metal test results describe what the item was actually tested for.
Can you manufacture to our heat exposure and our branding?
Yes. We produce reflective and FR high-temperature garments against the exposure you describe, with your labels, sizing and the test documentation that supports the rating.
Specify the heat protection system
Describe the heat source, the task and the exposure duration, and we will come back with a fabric recommendation and a quotation.
Request a heat protection quotation