Methods: color reaction of free amino acids with ninhydrin was adopted, since, in certain extent, the color depth is correlated with the amino acid content.
In white and color rubber products, add white in the sunlight, insolation, no crack resistance, don't angry, stretching rate and acid and alkali resistant.
在白色和彩色橡胶制品中加入钛白粉，在日光照射下，耐日晒，不开裂、不变色，伸展率大及耐酸碱。
3
Methods: Acid hydrolysis, base display color and colorimetric method.