The yellowing of the polyurethane soft foam sponge of auditorium chairs and theater chairs has always been a problem that has puzzled sponge manufacturers and polyol manufacturers for a long time. Many sponge manufacturers, especially some high-end sponge manufacturers, try to improve the anti-yello......

With the rapid economic development and accurate corporate positioning, Zhongyuan has developed rapidly like an eagle spreading its wings, and the production and sales have been harvested in an all-round way.（China catalyst)

The compatibility of the base paint and the PU color paste affects the accuracy and economy of color mixing. The compatibility can be seen through the finger grinding test and the method of mixing the color paste and the base paint for a long time.