The most popular epoxy resins are possibly diglycidyl ethers of bisphenol A, which can be created by reacting bisphenol A (BPA) with epichlorohydrin (ECH). the molecular body weight is controlled by changing the ratio of ECH to BPA; substantial ratios generate lessen molecular weights. Waterproofing adalah teknik membuat atap / https://www.propanraya.com/kategori/cat-lantai