phenol-formaldehyde cob
Phenolic resins yog cov khoom qub uas tsis muaj xim lossis daj-xim av pob tshab. Lawv feem ntau muag hauv khw nrog cov neeg ua xim xim rau xim liab, daj, dub, ntsuab, xim av, xiav thiab lwm yam xim, nyob rau hauv daim ntawv ntawm granules los yog hmoov. Nws tiv taus cov acids tsis muaj zog thiab tsis muaj zog hauv paus, nws decomposes thaum ntsib cov acids muaj zog, thiab nws corrodes thaum ntsib muaj zog alkalis.