The Most popular epoxy resins are either diglycidyl ethers of bisphenol A, that's developed by reacting bisphenol A (BPA) with epichlorohydrin (ECH). the molecular pounds is managed by altering the ratio of ECH to BPA; higher ratios deliver decreased molecular weights. Waterproofing adalah teknik membuat atap / dag beton pada https://www.propanraya.com/kategori/cat-lantai