How to identify various flame-retardant non-woven materials?

Flame-retardant non-woven fabric is a polymerization product of terephthalic acid or diethyl terephthalate and ethylene glycol. The characteristics are as follows: high strength, good elasticity, good heat resistance, smooth surface. When we all operate and identify various flame-retardant non-woven materials, we generally

1. Hand-feeling and visual inspection method: This method is suitable for non-woven fabric raw materials in loose fiber state.
(1) Cotton fiber is shorter and thinner than ramie fiber and other hemp fiber and wool fiber, often with various impurities and defects.
(2) The hemp fiber feels rough and hard.
(3). The wool fiber is curled and elastic.
(4) Silk is a long filament, long and slender, with special luster.
(5) Spandex yarn has very large elasticity, and its length can be stretched to more than five times at room temperature.
(6) Among chemical fibers, only viscose fiber has a large difference in strength between dry and wet states.

2. Microscopic observation method: It is to identify the non-woven fabric fiber according to the longitudinal and cross-sectional morphological characteristics of the fiber.
(1) Cotton fiber: cross-sectional shape: round waist with middle waist; longitudinal shape: flat ribbon shape with natural twist.
(2). Hemp (ramie, flax, jute) fiber: cross-sectional shape: waist round or polygonal, with a middle cavity; longitudinal shape: horizontal nodes, vertical lines.
(3). Wool fiber: cross-sectional shape: round or approximately round, some with pith; longitudinal shape: scales on the surface.
(4). Rabbit hair fiber: cross-sectional shape: dumbbell-shaped with hair pith; longitudinal shape: scales on the surface.
(5) Mulberry silk fiber: cross-sectional shape: irregular triangle; longitudinal shape: smooth and straight, with stripes longitudinally.
(6). Ordinary viscose fiber: cross-sectional shape: zigzag, skin-core structure; longitudinal shape: longitudinal grooves.
(7) Acetate fiber: cross-sectional shape: trilobal or irregular zigzag shape; longitudinal shape: longitudinal stripes on the surface.
(8), rich and strong fiber: cross-sectional shape: less tooth shape, or round, oval; longitudinal shape: smooth surface.

When we all use flame-retardant non-woven materials, we can identify them according to the above two methods. This is what we all need.