The preferred epoxy resins are both diglycidyl ethers of bisphenol A, that is produced by reacting bisphenol A (BPA) with epichlorohydrin (ECH). the molecular weight is controlled by changing the ratio of ECH to BPA; substantial ratios generate reduce molecular weights. Epoxy is a versatile product which is greatly used https://www.propanraya.com/kategori/cat-lantai