However , the cashmere yarn abruptly extends at 190 ℃ under the higher tensile stress of 200 MPa , so its " viscous flow " temperature is lower than its melting one .
而在较高的拉伸应力条件（200MPa）下，山羊绒单纱在190℃就发生突变伸长，即山羊绒纤维的粘流温度低于结晶熔融温度。
viscous flow temperature