The most well-liked epoxy resins are both diglycidyl ethers of bisphenol A, which can be developed by reacting bisphenol A (BPA) with epichlorohydrin (ECH). the molecular excess weight is controlled by adjusting the ratio of ECH to BPA; large ratios make reduced molecular weights. Waterproofing adalah teknik membuat atap / https://www.propanraya.com/kategori/cat-lantai