Test the retardation effect of citric acid in gypsum plaster

[@vahedkolahi1587]

سلام لتفا برام توضیع بدین چطورگچ را دیر گیر کنم

[@AnwarKhan-zr7qq]

Hi

[@hebeiderekchemicallimited7871]

hi Anwar, thanks for your attention, and glad to talk with you on whatsapp

[@dr.nadermostafa8193]

How can I extent setting time over 40 minutes