Crystallized meta-aramid blends for improved flash fire and arc protection
AssigneeE. I. Du Pont de Nemours and Company
InventorReiyao Zhu
Life of this patent
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Abstract
A yarn, fabric, and garment suitable for use in arc and flame protection and having improved flash fire protection contains a majority, by weight, of meta-aramid fibers having a degree of crystallinity of at least 20%, and a minority of modacrylic fibers, para-aramid fibers, and antistatic fibers. Garments made from the yarns provide thermal protection such that a wearer would experience less than a 65 percent predicted body burn when exposed to a flash fire exposure of 4 seconds per ASTM F1930, while maintaining a Category 2 arc rating per ASTM F1959 and NFPA 70E.
Claims15
A yarn for use in arc and flame protection consisting essentially of:
- (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%;
- (b) 10 to 30 weight percent modacrylic fiber;
- (c) 5 to 20 weight percent para-aramid fiber;
- and
- (d) 1 to 3 weight percent antistatic fiber;
- said percentages on the basis of components (a), (b), (c), and (d).
A fabric suitable for use in arc and flame protection comprising a yarn consisting essentially of:
- (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%;
- (b) 10 to 30 weight percent modacrylic fiber;
- (c) 5 to 20 weight percent para-aramid fiber;
- and
- (d) 1 to 3 weight percent antistatic fiber;
- said percentages on the basis of components (a), (b), (c), and (d);
- the fabric having a basis weight in the range of 186.5 to 237 grams per square meter (5.5 to 7 ounces per square yard).
A garment suitable for use in arc and flame protection comprising a fabric consisting essentially of:
- (a) 50 to 80 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%;
- (b) 10 to 30 weight percent modacrylic fiber;
- (c) 5 to 20 weight percent para-aramid fiber;
- and
- (d) 1 to 3 weight percent antistatic fiber;
- said percentages on the basis of components (a), (b), (c), and (d)
- the fabrics having a basis weight in the range of 186.5 to 237 grams per square meter (5.5 to 7 ounces per square yard).
Dependencies are inferred from the claim text.