PMC-hard rubbers
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Smooth-On is one of the world’s leading manufacturers of 3D modeling materials such as mold-making, casting and special effects materials, as well as industrial casting resins, adhesives and equipment. FormX is the main distributor of Smooth-On products in Europe.
PMC-Series
These are somewhat harder PU-rubbers that are traditionally used in the ceramic industry. They exhibit excellent wear resistance, cure with negligible shrinkage and are economical.
- Technical bulletin PMC 744
- Technical bulletin PMC 746
- Technical bulletin PMC 770
- Technical bulletin PMC 780
- Technical bulletin PMC 790
PMC-744 info
PMC-744 has been used for years by mold making professionals to cast plaster, concrete, resins, etc. It is excellent for making molds that are strong, durable and dimensionally stable. Low viscosity ensures fine detail reproduction.
PMC-744 is ideal for making ceramic case molds and plaster block molds, reproducing ornamental plaster, making molds for casting concrete, casting a variety of Smooth-On urethane resins, casting wax and making a variety of mechanical rubber parts.
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Semi Transparent Amber Colour
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Shore 44A
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PMC-746 info
PMC-746 was developed to make molds for casting gypsum plasters. It is well suited for use as a rubber case mold – especially large case molds where extra rigidity is required. Durability and moisture resistant properties PMC-746 is also used by zoos and museums for a variety of mold-making, display and exhibit applications. Other applications include making plaster block molds, reproducing ornamental plaster, pre-cast concrete molds, casting waxes, rigid polyurethanes, epoxies and a variety of special effects.
Shore hardness is 60 A mix ratio: 2:1 by weight or volume contains no mercury.
PMC™-746
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PMC™-746 Amber Clear
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PMC-770
Shore 70A rubber that has exceptional dimensional stability. It is suitable for production casting of abrasive materials such as concrete (pre-cast concrete, making concrete stamping pads, etc.) and gypsum plasters with high exotherms. Suitable for rubber mechanical parts of varying configurations (gaskets, wheels, pulleys) as well as ball mill liners and vibration/shock pads.
Shore 70A hardness mixed two parts A to one part B by weight
PMC™-770
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PMC-780 WET
PMC™-780 WET contains a built-in release agent to aid in demolding concrete.
)Both are used around the world for casting abrasive materials such as concrete (pre-cast concrete, making concrete stamping pads, etc.) and gypsum plasters with high exotherms.
Shore 80A Hardness - mixed two parts A to one part B by weight -negligible shrinkage
PMC™-780 WET
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PMC-780 DRY
PMC®-780 Dry is also commonly used to make rubber mechanical parts of varying configurations (gaskets, wheels, pulleys) as well as ball mill liners and vibration/shock pads. PMC®-780 Dry does not exude an oil.
PMC®-780 is a premium performance urethane rubber that offers exceptional strength, durability and abrasion resistance.
Shore 80A hardness mixed two parts A to one part B by weight negligible shrinkage
PMC™-780 DRY
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PMC-790
PMC®-790 Urethane Rubber - PMC®-790 is an industrial urethane rubber compound designed to meet the most stringent requirements of industrial production applications. It is a very hard rubber that offers superior tear and tensile strength as well as impact and abrasion resistance.PMC®-790 is suitable for a variety of industrial applications including making concrete stamping pads, mold liners and molds for casting concrete. PMC®-790 is also good for making ball mill liners, industrial rollers and belts, rubber mechanical parts.
Shore 90A hardness
PMC™-790
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PMC Properties Table
| PMC | A:B Mixing Ratio | Demold Time | Elongation at Break | Mixed Viscosity | Pot Life | Shore A Hardness | Tear Strength | Specific Gravity (kg/lt) |
|---|---|---|---|---|---|---|---|---|
| 744 | 2:1 weight/volume | 16 hrs | 400% | 3400 cps | 15 min | 44 A | 90 pli | 1.000 |
| 746 | 2:1 weight/volume | 16 hrs | 650% | 1200 cps | 15 min | 60 A | 100 pli | 1.000 |
| 770 | 2:1 by weight | 16 hrs | 600% | 3000 cps | 35 min | 70 A | 160 pli | 1.015 |
| 780 | 2:1 weight/volume | 48 hrs | 700% | 2000 cps | 25 min | 80 A | 200 pli | 1.015 |
| 790 | 2:1 weight/volume | 48 hrs | 600% | 3000 cps | 20 min | 90 A | 300 pli | 1.068 |
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