A very strong fibre which does not lose strength when wet and has good durability, low elasticity, very good drape and outstanding wet and dry resilience, so resists wrinkling well. The handle is medium to hard. Moisture absorbency and heat conductivity are poor and it is clammy to wear. It is difficult to dye, is generally resistant to acids, alkalis and micro-organisms and has a very good sunlight resistance. Polyester is stained easily by oils.
Acrylic -Modacrylic A synthetic fibre.
Moderately high strength with good durability. The handle is soft and the drape good. Acrylic stretches easily, so has poor dimensional stability. A poor conductor of heat, it is warm to wear although its poor absorbency causes it to sometimes feel clammy. Resistant to acids, micro-organisms, insects and sunlight, but is effected by alkalis after considerable time.