{"product_id":"hydrocal-fgr-95","title":"Hydrocal® FGR 95","description":"\u003cp\u003eAVAILABLE IN 5, 25, AND 50LB OPTIONS IN THE DROPDOWN\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMix Ratio Parts Water by Weight per 100 Parts Plaster: 30 by weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUSG Hydrocal® Brand FGR 95 Gypsum Cement is a high-strength gypsum cement specially\u003cbr\u003eformulated for use with glass fiber for fabricating glass-reinforced architectural details. The alpha\u003cbr\u003ehemihydrate gypsum-based material has low water requirements that results in high-strength,\u003cbr\u003ehigh-density glass fiber-reinforced gypsum pieces. It is ideal for producing lightweight, thin-cast,\u003cbr\u003efire-resistant architectural casts.\u003c\/p\u003e\n\u003cp\u003eWith its superior fabrication flexibility – from simple cornices to ornate capitals and medallions\u003cbr\u003e– USG Hydrocal FGR 95 Gypsum Cement effectively duplicates pieces formerly made of plaster,\u003cbr\u003ewood, concrete and stone. USG Hydrocal FGR 95 Gypsum Cement overcomes building fire code\u003cbr\u003eincompatibilities faced by many plastics – at roughly one-third the cost of filled polyesters.\u003cbr\u003eExceptionally quick setting (45 – 75 minutes), USG Hydrocal FGR 95 Gypsum Cement accepts\u003cbr\u003emost coatings and finishes.\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\u003cbr\u003eslurry (USG Hydrocal FGR 95 Gypsum Cement and water mixture) temperature produce variations\u003cbr\u003ein set time, it is important to keep both the USG Hydrocal FGR 95 Gypsum Cement and water in a\u003cbr\u003estable temperature environment prior to use. The higher the temperature of the slurry, the shorter\u003cbr\u003ethe 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 FGR 95 Gypsum Cement and the water prior to use for each mix.\u003cbr\u003eThe water-to-USG Hydrocal FGR 95 Gypsum Cement ratio is critical because it governs the\u003cbr\u003estrength and the density of the final cast.\u003c\/p\u003e\n\u003cp\u003eSift or strew USG Hydrocal FGR 95 Gypsum Cement into the water slowly and evenly. Do not drop\u003cbr\u003elarge amounts of USG Hydrocal FGR 95 Gypsum Cement directly into the water as proper soaking\u003cbr\u003eof the USG Hydrocal FGR 95 Gypsum Cement may not occur. USG Hydrocal FGR 95 Gypsum\u003cbr\u003eCement should be fully dispersed in the water prior to mixing. Small batches require less soaking\u003cbr\u003etime than large batches. See USG IG503 Plaster Mixing Procedures for specific soaking instructions.\u003c\/p\u003e\n\u003cp\u003eMixing USG Hydrocal FGR 95 Gypsum Cement slurry is one of the most important steps in\u003cbr\u003eproducing USG Hydrocal FGR 95 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 FGR 95\u003cbr\u003eGypsum Cement can be mechanically mixed through both batch and continuous processes.\u003cbr\u003eProper blade and bucket dimensions are important for obtaining the best\u003cbr\u003ebatch mix (see USG IG503 Plaster Mixing Procedures for details).\u003c\/p\u003e\n\u003cp\u003eLonger mixing times result in higher mold strength\u003cbr\u003eand shorter set times.\u003c\/p\u003e\n\u003cp\u003eAPPLICATION\u003c\/p\u003e\n\u003cp\u003eUSG Hydrocal FGR 95 Gypsum Cement slurry can be applied via hand lay-up, spray-up or solid casting\u003cbr\u003edepending on the mold complexity, size and depth, desired surface finish and quantity needed.\u003c\/p\u003e\n\u003cp\u003eThe most common method to fabricate large and\/or complicated open-mold architectural pieces\u003cbr\u003eis to use the hand lay-up method. Using a brush, apply a thin face coat of USG Hydrocal FGR\u003cbr\u003e95 Gypsum Cement slurry (without glass fibers) to the properly prepared mold to a maximum\u003cbr\u003ethickness of 1\/16 in. (1.6 mm). Take care to cover all surfaces with the face coat and as quickly as\u003cbr\u003epossible. As the face coat starts to lose its gloss yet is still tacky (do not allow the face coat to be\u003cbr\u003ehard and set), hand or brush apply a reinforcing coat of slurry with chopped glass fibers added,\u003cbr\u003eor by alternating layers of slurry and glass fiber veil. The reinforcing coat slurry should be mixed\u003cbr\u003eseparately approximately 10 to 15 minutes after the face coat slurry. Use a brush to compact the\u003cbr\u003eglass fibers into corners of the mold so no bridging occurs. Be careful not to push the glass fibers\u003cbr\u003ethrough the face coat. The total thickness of reinforcing layers depends upon the targeted flexural\u003cbr\u003estrength and weight of the finished cast part.\u003c\/p\u003e\n\u003cp\u003eThe spray-up method is best used for molds that are uncomplicated, or simplistic designs that\u003cbr\u003ehave high demand and need to be fabricated with higher daily volume output. Using a peristaltic\u003cbr\u003epump with a liquid accelerator pump and a spray gun mounted with a glass fiber roving chopper,\u003cbr\u003espray a thin face coat of USG Hydrocal FGR 95 Gypsum Cement slurry to a maximum thickness of\u003cbr\u003e1\/32 in. (0.8 mm), covering all faces of the mold. As the face coat starts to lose its gloss yet is still\u003cbr\u003etacky (do not allow the face coat to be hard and set), simultaneously apply a reinforcing coat of\u003cbr\u003eslurry and chopped glass fibers. A roller or brush should be used to compact the USG Hydrocal\u003cbr\u003eFGR 95 Gypsum Cement slurry and chopped glass fibers into corners and around any complicated\u003cbr\u003eareas. The total thickness of the reinforcement coat depends upon the targeted flexural\u003cbr\u003estrength and weight of the finished cast part. Follow all pump, hose and sprayer manufacturers’\u003cbr\u003erecommendations for usage with water-based slurry and chopped glass fibers.\u003c\/p\u003e\n\u003cp\u003eFor molds of greater depths and simple design features without using glass fibers, the solid casting\u003cbr\u003etechnique can be used. Depending upon final weight, strength and installation considerations, it\u003cbr\u003eis possible to mix USG Hydrocal FGR 95 Gypsum Cement slurry and pour directly into the mold\u003cbr\u003euntil the mold is completely full. Slight vibration just after pouring will help encourage air bubble\u003cbr\u003erelease. A brush can also be used to ‘puddle’ the slurry in the deeper parts of the mold to remove\u003cbr\u003eair. This method rarely is used with chopped glass fibers already mixed in with the slurry as it is\u003cbr\u003edifficult to achieve a fiber and air bubble-free face coat.\u003c\/p\u003e\n\u003cp\u003eA second method of solid casting employs a displacement plug approach where a backside mold is\u003cbr\u003eused to displace slurry in deeper parts of the mold. The result is similar to hand lay-up and spray-up\u003cbr\u003emethods and tends to be a faster fabrication process than the previous methods with deep relief molds.\u003c\/p\u003e\n\u003cp\u003eDRYING\u003cbr\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 FGR 95 Gypsum Cement molds are safe from\u003cbr\u003ecalcination is 120 °F (49 °C). Before removing molds from the dryer, the temperature should\u003cbr\u003eapproach that of the area around the dryer to prevent thermal shock. See IG502 Drying Plaster\u003cbr\u003eCasts for additional information.\u003c\/p\u003e\n\u003cp\u003eSTORAGE AND USE\u003cbr\u003eWhen properly used, USG Hydrocal FGR 95 Gypsum Cement is easy to work with and complies\u003cbr\u003ewith the federal Labeling of Hazardous Art Materials Act, 12 U.S.C. Section 1277 and ASTM D4236.\u003cbr\u003eKeep indoors at temperatures between 65 °F – 75 °F (18 °C – 24 °C) and 45% – 55% RH. Do not\u003cbr\u003estack more than two pallets high. Keep from drafts. Rotate stock. USG Hydrocal FGR 95 Gypsum\u003cbr\u003eCement should be used within six months of the manufacturing date located on the package.\u003cbr\u003eAlways follow handling and use directions and safety warnings on the package.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.usg.com\/content\/dam\/USG_Marketing_Communications\/united_states\/sds\/usg-hydrocal-fgr-gypsum-cements-sds-en-52000000017.pdf\" rel=\"noopener\" target=\"_blank\"\u003eSDS\u003c\/a\u003e\u003c\/p\u003e","brand":"USG","offers":[{"title":"5lb","offer_id":48015594357051,"sku":"47999","price":20.0,"currency_code":"USD","in_stock":false},{"title":"25lb","offer_id":48015594291515,"sku":"47999A","price":39.0,"currency_code":"USD","in_stock":false},{"title":"50lb","offer_id":48015594324283,"sku":"47999B","price":52.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0780\/7539\/6411\/files\/fgr.jpg?v=1710986975","url":"https:\/\/maacaffestore.com\/products\/hydrocal-fgr-95","provider":"The Compleat Sculptor, Inc","version":"1.0","type":"link"}