{"product_id":"mold-making-urethane-liquid-rubber-polytek-74-45","title":"Mold Making Urethane Liquid Rubber Polytek 74-45","description":"\u003ch2\u003eMold Making Urethane Liquid Rubber: 74-Series: 74-45\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePoly 74-45 Liquid Rubber is a two-part, liquid polyurethane system that cures (RTV) to a yellow, Shore A45 rubber. This is a pourable rubber, but it can be easily thickened with PolyFiber II Thickener for brush-on application.\u003c\/li\u003e\n\u003cli\u003eCreate your own custom molds using a professional, high-quality molding rubber.\u003c\/li\u003e\n\u003cli\u003eThe 74-45 Mold Rubber is a 45 shore polyurethane, with medium flexibility.\u003c\/li\u003e\n\u003cli\u003e30 minute pour time. Cures in 16-24 hours.\u003c\/li\u003e\n\u003cli\u003ePoly 74-45 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under repeated casting.\u003c\/li\u003e\n\u003cli\u003ePoly 74-45 is popular for casting decorative architectural concrete panels and accessories.\u003c\/li\u003e\n\u003cli\u003eMix Ratio is 1A:1B for this product (you mix equal weights of part A and part B).\n\u003cul\u003e\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003ePoly 74-45 is available in kits that net weights of: 4 lbs, 16 lbs, 80 lbs, and drums of 900 lbs.\u003c\/li\u003e\n\u003cli\u003eMold Rubber MUST be mixed by weight, using a scale such as these sold on Amazon.com for around $95.00.\u003c\/li\u003e\n\u003cli\u003eCan be \u003cinline style=\"color: #c0504d; background-color: #000000;\"\u003epi\u003c\/inline\u003e\u003cinline style=\"background-color: #000000;\"\u003e\u003cinline style=\"color: #4f81bd;\"\u003egm\u003c\/inline\u003e\u003cinline style=\"color: #9bbb59;\"\u003een\u003c\/inline\u003e\u003cinline style=\"color: #ffe694;\"\u003ete\u003c\/inline\u003e\u003c\/inline\u003e\u003cinline style=\"color: #938953; background-color: #000000;\"\u003ed\u003c\/inline\u003e using PolyColors (sold separately) coloring dyes.\u003c\/li\u003e\n\u003cli\u003eDownload: Poly 74 Series Instruction Guide: TDS.\u003c\/li\u003e\n\u003cli\u003eDownload: Poly 74 Series Safety Data Sheet: Part A MSDS. Part B MSDS.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eHow Much Mold Making Urethane Liquid Rubber Do You Need?\u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMold Rubbers have different specific volume amounts that 1 lb. of material creates. All Poly 74 Series rubber have a specific volume of 27.5 in³, which is roughly a 3\" x 3\" cube (3\" x 3\" x 3\" = 27 in³)\u003c\/li\u003e\n\u003cli\u003eEstimating How Much Rubber You Need:\n\u003cul\u003e\n\u003cli\u003e1. Calculate the volume of the total mold box\/cylinder in cubic inches.\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003eFor a box: V = L x W x H\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cb\u003eFor a cylinder: V = π x r² x H\u003c\/b\u003e\u003c\/li\u003e\n\u003cli\u003eWhere: L = Length, W = Width, H = Height, π = 3.14, r = Radius\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e2. If molding a model\/object, estimate the volume of the object.\u003c\/li\u003e\n\u003cli\u003e3. Subtract the estimated volume of the model from the volume of the mold box\/cylinder.\u003c\/li\u003e\n\u003cli\u003e4. Divide the result (volume of mold area) by specific volume of the mold rubber to determine the lbs. of mold rubber needed.\n\u003cul\u003e\n\u003cli\u003eExample: The volume of a rectangular mold box: 10 in x 5 in x 5 in = 250 in³\u003c\/li\u003e\n\u003cli\u003eThe volume of the model\/object : 8 in x 3 in x 3 in = 72 in³\u003c\/li\u003e\n\u003cli\u003eSubtract the volume of the model from the volume of the mold box: 250 in³ - 72 in³ = 178 in³\u003c\/li\u003e\n\u003cli\u003eDivide by the specific volume of Poly 74-20 Liquid Rubber (27.5 in³\/lb): 178 in³ ÷ 27.5 in³\/lb = \u003cb\u003e6.5 lbs. Rubber\u003c\/b\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eAbout Polyurethane Mold Rubbers by Polytek:\u003cbr\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003ePoly 74 Series of Mold Rubber is Polytek’s easiest-to-use and most versatile mold rubbers. Ranging from soft 74-20 (A20 shore value) to mid-range hardness 74-45 (A45 shore value), the 74 Series of mold rubbers are popular with plaster casters, concrete precasters and art foundries. Can be poured as supplied, or made brushable by mixing in Poly Fiber II (sold separately).\u003c\/li\u003e\n\u003cli\u003eCast Concrete Urethane Rubber Product Recommendations:\n\u003cul\u003e\n\u003cli\u003e\nPoly 74-20: Veneer Stone, Intricate Architectural Elements\u003c\/li\u003e\n\u003cli\u003e\nPoly 74-45: Decorative Architectural Elements, Decorative Concrete Edging\u003c\/li\u003e\n\u003cli\u003e\nPoly 75-60: Concrete Sink Molds, Plugs, Edging, Simple Architectural Elements, Flex\/Floppy Stamping Mats\u003c\/li\u003e\n\u003cli\u003e\nPoly 75-65: Form Liners, Paver Molds\u003c\/li\u003e\n\u003cli\u003e\nPoly 75-70: Form Liners\u003c\/li\u003e\n\u003cli\u003e\nPoly 75-80: Form Liners, Stamping Mats\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003eShore hardness determines how flexible the rubber is when cured. A lower number means more flexible, which will usually allow the rubber to make molds that are more intricate and detailed, where the rubber can form 'around' objects better and peel off easier when done. Higher numbers are more rigid, which provides greater durability for long term use of the mold.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ccenter\u003e\u003cimg src=\"https:\/\/s3.amazonaws.com\/Expressions-LTD\/Images\/rubber+shore+rating.jpg?width=700\" alt=\"Expressions LTD Mold Rubber Shore Rating\"\u003e\u003c\/center\u003e\n\u003cp\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/3WYUCCgpZbs\" height=\"250\" width=\"600\"\u003e\u003c\/iframe\u003e\u003cbr\u003e\u003cb\u003eUsing Mold Rubber:\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlease refer to the TDS Instruction Sheet above for all mixing and application information.\u003c\/li\u003e\n\u003cli\u003e\nPol-Ease 2300 (sold separately) is an aerosol release that should be used on any surface the rubber is poured onto, during mold making, to prevent sticking.\u003c\/li\u003e\n\u003cli\u003e\nPol-Ease 2650 (sold separately) is an silicone-free release that should be used on the rubber molds when casting concrete or plaster, to prevent concrete from sticking to the mold. Pol-Ease 2300 will also work to prevent concrete from sticking to the rubber mold, but may create a shiny surface on the concrete.\u003c\/li\u003e\n\u003cli\u003e\nPolyCoat (sold separately) should be used to seal non-rubber surfaces (such as wood, concrete, tile, rock, etc.) before molding off it, or to treat Polyurethane Molds that will have repeated molds made from that master- without needing to apply a release every time.\u003c\/li\u003e\n\u003cli\u003e\nPolyplasticine Clay (sold separately) that is sulfur free should be used to seal off the molds when pouring mold rubber.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cb\u003eStorage Information:\u003c\/b\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMaterial should be stored at room temperature (@ 75°F) for 24 hours prior to use.\u003c\/li\u003e\n\u003cli\u003eShelf life of the liquid rubber components is approx. 6 months. Air and humidity is the largest factor in making the material go bad, so care should be taken to immediately re-close the containers after pouring out any material. It is strongly recommended to use PolyPurge (sold separately) each time a container is opened\/closed: PolyPurge is a heavier-than-air dry gas that when sprayed for a few seconds into the container, will create a barrier between any air moisture and the polyurethane rubber product.\u003c\/li\u003e\n\u003cli\u003ePolyurethane molds should be stored flat to avoid deforming over time, and kept out of sunlight. Any molds that will be occasional left in sunlight should be made using UV Additive (sold separately) when mixing the rubber, to help the mold resist UV damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eVideos:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUsing Poly 74-45 to Make a warped concrete table:\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"600\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/pL5El7wMGyM\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eUsing Poly 74-45 to Make a Travertine mold (part 1 of 2)\u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/3eZGKKkImtY\" height=\"400\" width=\"600\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan data-mce-fragment=\"1\"\u003eUsing Poly 74-45 to Make a Travertine mold (part 2 of 2)\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"600\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/8SJQLUrwTx4\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Polytek","offers":[{"title":"4 lb kit (@ 2 quarts)","offer_id":46517629485113,"sku":"mmt1789529202834","price":55.14,"currency_code":"USD","in_stock":true},{"title":"16 lb kit (@ 2 gallons)","offer_id":46517629517881,"sku":"yue1789529202835","price":127.15,"currency_code":"USD","in_stock":true},{"title":"80 lb kit (@10 gallons)","offer_id":46517629550649,"sku":"cmy1789529202836","price":445.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0796\/9888\/6713\/files\/mold-making-urethane-liquid-rubber-polytek-74-45_1.jpg?v=1789529207","url":"https:\/\/tonalstylingoutfit.shop\/products\/mold-making-urethane-liquid-rubber-polytek-74-45","provider":"My Store","version":"1.0","type":"link"}