Ana amfani da HPMC a cikin Bango Putty/Skim Coat
HPMC, ko Hydroxypropyl Methyl Cellulose, yana aiki da manufofi daban-daban dangane da matsayinsa. A China, ana amfani da shi sosai wajen gini. Musamman ma, wajen samar da fenti mai kauri ko kuma fenti mai kauri, ana haɗa foda mai kauri, gami da HPMC da sauran kayan foda, sannan a narkar da shi ta hanyar ƙara ruwa. Wannan hanyar tana hana taruwa saboda narkewar ƙwayoyin HPMC nan take a cikin ruwa.
Zafin gel na HPMC ya dogara da yawan methoxy da yake da shi; ƙarancin sinadarin methoxy yana haifar da yawan zafin gel. Ruwan sanyi mai narkewa nan take HPMC, wanda aka yi wa magani da glyoxal, yana warwatse cikin sauri a cikin ruwan sanyi, yana nuna ƙaruwar danko amma ba cikakken narkewa ba. A gefe guda kuma, HPMC mai narkewa cikin zafi, wanda ba a yi masa magani da glyoxal ba, yana warwatse da sauri amma yana da ɗanko a hankali tare da ƙananan adadi. Ana iya rarraba HPMC zuwa nau'ikan da ke narkewa cikin sauri da zafi. Samfuran nan take suna warwatse cikin sauri a cikin ruwan sanyi kuma suna ƙara danko a hankali, suna samar da colloid mai haske. Nau'ikan da ke narkewa cikin zafi, waɗanda suka dace da skim coat da turmi, suna nuna haɗuwa a cikin manne da shafi na ruwa.
Samar da HPMC ya ƙunshi hanyar narkewa ta amfani da toluene ko isopropyl barasa. Aiwatar da foda mai laushi yana buƙatar ƙarancin danko, kusan 10,000, tare da mai da hankali kan kariyar ruwa. Aiwatar da turmi yana buƙatar ƙarin danko, kusan 15,000, yayin da aikace-aikacen manne yana buƙatar samfuran nan take masu ɗanko mai yawa. Ainihin adadin HPMC da ake amfani da shi ya bambanta dangane da yanayi, yanayin zafi na muhalli, ingancin sinadarin calcium mai launin toka na gida, dabarar skimcoat, da buƙatun ingancin abokin ciniki.
HPMC, wanda ke da ɗanɗano 100,000 a cikin foda mai laushi, yana taka muhimmiyar rawa wajen riƙe ruwa da kauri. Duk da haka, a aikace, ɗanɗano daga 70,000 zuwa 80,000 abin karɓa ne. Babban aikin HPMC a cikin gashin mai laushi ya haɗa da kauri, riƙe ruwa, da taimakawa gini. Ba ya shiga cikin halayen sinadarai amma yana taimakawa wajen hana samuwar kumfa ta hanyar tabbatar da busarwa yadda ya kamata.
Alaƙa tsakanin foda mai laushi/ruwan toka da ingancin sinadarin calcium na toka yana da matuƙar muhimmanci, yayin da tasirin HPMC ke da iyaka. Matsayin HPMC a riƙe ruwa na iya shafar faɗuwar foda, kuma hulɗarsa da ruwa yayin shafa fenti mai laushi ya haɗa da amsawar sinadarai, wanda ke samar da sabon abu (calcium carbonate). Duk da haka, HPMC da kanta ba ta shiga cikin waɗannan halayen ba.
Dabbobi daban-daban na foda na bango suna biyan buƙatu daban-daban, kamar su putty na ciki na ciki, putty na ciki mai tauri, putty na ciki mai jure ruwa, putty na waje mai tauri, putty na ciki mai jure wa mildew, da putty na waje mai jure wa fasawa na bango mai laushi, da sauransu. Kowace dabara tana ƙayyade adadin Redispersible Polymer Powder (RDP), foda mai tashi biyu, foda mai launin toka na calcium, siminti fari, da HPMC, waɗanda aka tsara don takamaiman aikace-aikace kamar turmi, manne, ko shafi.