One Process of manfacturing the PU items is to spray release agent on the mould.The release agent is help you to carry our the stress products from the mould smoothly but keeps the original hardness however.
Some suppliers or factories use an substitute of release agent in order to save cost(release agent cost is consisted of important cost for whole stress products) and quality may could not be guaranteed.
So how do you differ these?
Generally speaking,if you squeeze the stress products,you will feel the hardness on the surface and inside the stress balls is a little difference.if so,suppliers or factories use an alternative release agent.
