{"product_id":"hydrocal-white","title":"Hydrocal® White","description":"\u003cp\u003eAVAILABLE IN 5, 25, AND 50LB OPTIONS IN THE DROPDOWN\u003c\/p\u003e\n\u003cp\u003eUSG Hydrocal® Brand White Gypsum Cement is a good multi-purpose product for people looking\u003cbr\u003eto upgrade from a standard plaster product to one that has a higher degree of hardness and\u003cbr\u003eimpact resistance. USG Hydrocal White Gypsum Cement is designed for solid and hollow casting\u003cbr\u003eand is ideal for giftware and lamp base applications. USG Hydrocal White Gypsum Cement is\u003cbr\u003ecompatible with numerous color pigments. \u003c\/p\u003e\n\u003cp\u003eMIXING INSTRUCTIONS\u003c\/p\u003e\n\u003cp\u003eUse potable water at temperatures between 70 °F (21 °C) and 100 °F (38 °C). Because variations in slurry (USG Hydrocal White Gypsum Cement and water mixture) temperature produce variations in set time, it is important to keep both the USG Hydrocal White Gypsum Cement and water in a stable temperature environment prior to use. The higher the temperature of the slurry, the shorter the set time. Conversely, the lower the temperature of the slurry, the longer the set time.\u003c\/p\u003e\n\u003cp\u003eWeigh both the USG Hydrocal White Gypsum Cement and the water prior to use for each mix. The water-to-USG Hydrocal White Gypsum Cement ratio is critical because it governs the strength and the density of the final cast. \u003cspan\u003e\u003cem\u003eRequires 45 parts water by weight per 100 parts plaster\u003c\/em\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSift or strew USG Hydrocal White Gypsum Cement into the water slowly and evenly. Do not drop\u003cbr\u003elarge amounts of USG Hydrocal White Gypsum Cement directly into the water as proper soaking\u003cbr\u003eof the USG Hydrocal White Gypsum Cement may not occur. USG Hydrocal White Gypsum Cement\u003cbr\u003eshould be fully dispersed in the water prior to mixing. Small batches require less soaking time than\u003cbr\u003elarge batches. See USG IG503 Plaster Mixing Procedures for specific soaking instructions.\u003cbr\u003eMixing USG Hydrocal White Gypsum Cement slurry is one of the most important steps in\u003cbr\u003eproducing USG Hydrocal White Gypsum Cement casts with maximum strength, absorption,\u003cbr\u003ehardness and other important properties.\u003c\/p\u003e\n\u003cp\u003eMechanically mixed slurries develop uniform casts with optimal strengths. USG Hydrocal White\u003cbr\u003eGypsum Cement can be mechanically mixed through both batch and continuous processes. Proper\u003cbr\u003eblade and bucket dimensions are important for obtaining the best batch mix (see USG IG503\u003cbr\u003ePlaster Mixing Procedures for details).\u003c\/p\u003e\n\u003cp\u003eLonger mixing times result in higher mold strength and shorter set times.\u003c\/p\u003e\n\u003cp\u003ePOURING\u003c\/p\u003e\n\u003cp\u003eTo prevent air entrainment and provide a uniform, smooth surface, careful pouring of USG\u003cbr\u003eHydrocal White Gypsum Cement slurry is necessary. Agitation of the filled mold is a further step\u003cbr\u003eused to prevent air at or near the mold surface. Whenever possible, USG Hydrocal White Gypsum\u003cbr\u003eCement slurry should be poured carefully in the deepest area so that the slurry flows evenly across\u003cbr\u003ethe surface of the case mold.\u003c\/p\u003e\n\u003cp\u003ePouring a large amount of slurry directly on the face of the case mold may result in slight\u003cbr\u003edensification of the USG Hydrocal White Gypsum Cement mold at the point where it strikes the\u003cbr\u003esurface of the case. This produces a hard spot, giving uneven absorption.\u003c\/p\u003e\n\u003cp\u003eDRYING\u003c\/p\u003e\n\u003cp\u003eAll casts should be dried as quickly as is safely possible after manufacture so that maximum\u003cbr\u003ephysical properties can develop. Dry to a constant weight.\u003c\/p\u003e\n\u003cp\u003eThe best drying rooms or ovens provide 1) uniform and rapid circulation (minimum of 15-30 fps\u003cbr\u003e(4.6-9.1 mps)) of air with no “dead spots” having little or no air movement, 2) equal temperatures\u003cbr\u003ethroughout the entire area, and 3) provisions for exhausting a portion of the air while replacing\u003cbr\u003eit with fresh air. High humidity surrounding the drying room or oven inhibits drying efficiency\u003cbr\u003ebecause the air pulled into the room is incapable of picking up much moisture from the molds.\u003c\/p\u003e\n\u003cp\u003eThe maximum temperature at which USG Hydrocal White Gypsum Cement molds are safe from\u003cbr\u003ecalcination is 120 °F (49 °C). With substantial free water in the mold, a higher drying temperature\u003cbr\u003ecan be used without difficulty. As drying progresses, the temperature must be reduced to prevent\u003cbr\u003ecalcination. Before removing molds from the dryer, the temperature should approach that of the area\u003cbr\u003earound the dryer to prevent thermal shock. See IG502 Drying Plaster Casts for additional information.\u003c\/p\u003e\n\u003cp\u003eSTORAGE AND USE\u003c\/p\u003e\n\u003cp\u003eWhen properly used, USG Hydrocal White Gypsum Cement is easy to work with and complies with\u003cbr\u003ethe federal Labeling of Hazardous Art Materials Act, 12 U.S.C. Section 1277 and ASTM D4236. Keep\u003cbr\u003eindoors at temperatures between 65 °F - 75 °F (18 °C - 24 °C) and 45% - 55% RH. Do not stack\u003cbr\u003emore than two pallets high. Keep from drafts. Rotate stock. USG Hydrocal White Gypsum Cement\u003cbr\u003eshould be used within 6 months of the manufacturing date located on the package. Always follow\u003cbr\u003ehandling and use directions and safety warnings on the package.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" href=\"https:\/\/www.usg.com\/content\/dam\/USG_Marketing_Communications\/united_states\/sds\/usg-hydrocal-white-gypsum-cement-sds-en-52000000092.pdf\" target=\"_blank\"\u003eSDS\u003c\/a\u003e\u003c\/p\u003e","brand":"USG","offers":[{"title":"5lb","offer_id":48015592849723,"sku":"47350","price":20.0,"currency_code":"USD","in_stock":false},{"title":"25lb","offer_id":48015592784187,"sku":"47350A","price":35.0,"currency_code":"USD","in_stock":false},{"title":"50lb","offer_id":48015592816955,"sku":"47350B","price":49.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/gallery-large876657.jpg?v=1710986968","url":"https:\/\/maacaffestore.com\/products\/hydrocal-white","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}