Protective garment having a thermally reflective layer
Protective garment for environments having high radiant heat loads and/or high conductive heat loads is described. A protective footwear article and method of making includes an upper with an opaque outer layer; an inner layer; and a thermally reflective layer positioned between the outer layer and the inner layer, the thermally reflective layer having a reflective surface facing the outer layer.
1. A protective footwear article that meets the requirements of NFPA 1971 section 7.12, the protective footwear article including a sole attached to an upper having one or more specific sections, at least one of the one or more specific sections of the upper comprising:
an outer layer, wherein the entire outer layer is opaque, flame resistant and exhibits less than 50 percent transmission of incident visible light;
an inner layer comprising fabric; and
a thermally reflective layer positioned in between the opaque flame resistant outer layer and the inner layer, the thermally reflective layer consisting of a metalized material supported on a substrate, the metalized material of the thermally reflective layer being in direct contact with the outer layer, and the substrate of the thermally reflective layer being in direct contact with the inner layer when the upper is fully assembled.
2. The protective footwear article of claim 1 wherein the thermally reflective layer comprises an aluminized surface.
3. The protective footwear article of claim 1 wherein the substrate comprises a knit substrate.
4. The protective footwear article of claim 3 wherein the knit substrate comprises polybenzimidazole and poly-paraphenylene terephthalamide.
5. The protective footwear article of claim 4 wherein the knit substrate has a weight of about 5 ounces per square yard.
6. The protective footwear article of claim 1 wherein the reflective layer has a weight of about 7 ounces per square yard.
7. The protective footwear article of claim 1 wherein the thermally reflective layer defines at least one vent.
8. The protective footwear article of claim 1 wherein the protective footwear article is a boot.
9. The protective footwear article of claim 1 wherein the upper has a thickness of less than 1.5 cm.
10. The protective footwear article of claim 9 wherein the thermally reflective layer is positioned throughout the upper.
11. The protective footwear article of claim 1 wherein the opaque outer layer comprises leather.
12. The protective footwear article of claim 1 wherein the opaque outer layer has a thickness greater than 1 mm.
13. A method of making a protective footwear article comprising:
positioning a thermally reflective layer between an outer layer and an inner layer, the inner layer consisting of fabric, the entire outer layer being opaque and flame resistant, the thermally reflective layer consisting of a metalized material on a substrate and the outer layer exhibiting less than 50 percent transmission of incident visible light;
fully assembling the thermally reflective layer, the outer layer, and the inner layer into an upper of the protective footwear article wherein the metalized material of the thermally reflective layer is in direct contact with the outer layer and the substrate of the thermally reflective layer is in direct contact with the inner layer; and attaching a sole to the upper.
14. The method of claim 13 wherein metalized material is aluminized layer.
15. The method of claim 13 comprising adding one or more additional inner layers.
16. The method of claim 13 wherein the inner layer comprises a breathable waterproof membrane.
17. A structural firefighting boot capable of passing the additional performance requirements (7.12) for the proximity firefighting protective footwear elements only test of NFPA 1971 wherein the boot comprises a sole attached to an upper having a thickness of less than 1.5 cm, at least one section of the upper comprising:
an internal thermally reflective layer consisting of a metalized material on a substrate backing;
an internal layer comprising a flexible waterproof material; and
an outer layer, wherein the entire outer layer is opaque and flame resistant and exhibits less than 50 percent transmission of incident visible light and has a non-reflective outer surface, wherein the metalized material of the internal thermally reflective layer is in direct contact with the opaque outer layer and the substrate backing of the internal thermally reflective layer is in direct contact with the internal layer.
18. The structural firefighting boot of claim 17 wherein the upper have a thickness of less than 1.2 cm.