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Concrete Casting: Cast Stone Veneer
Polytek® liquid mold rubbers are the mold material of choice for high-volume veneer stone production (manual or automated manufacturing). These two-component mold rubbers capture excellent surface detail, offer exceptional dimensional stability and have unmatched lifetime and durability compared to hot melt and polypropylene systems.
Molds made from these room temperature curing systems can be completed in a much shorter timeframe (~16 hour demold) compared to latex rubber molds. When properly maintained, these molds can last for years and produce thousands of stones.
Popular product options are listed below:
POPULAR POLYURETHANE OPTIONS
A soft polyurethane rubber popular for multi-cavity molds. Can be thickened with PolyFiber II or Fumed Silica to make brush-on molds.
A mid-range hardness polyurethane rubber popular for panelized systems. Can be thickened with PolyFiber II or Fumed Silica to make brush-on molds.
POPULAR SILICONE OPTIONS
A medium hardness (Shore A30), platinum-cured silicone rubber that does not require form release. Can be thickened with PlatThix Liquid Thickener or Fumed Silica to make brush-on molds.
|PlatSil® HTS-Series Silicone Rubbers||The PlatSil® HTS-Series features high-performance, platinum-cured silicone rubbers that do not require form release. With the appropriate concrete mix design, the occurrence of efflorescence can be diminished when casting in HTS-Series molds compared to many other silicones. Product options include PlatSil® HTS-25 (a medium hardness Shore A25), PlatSil® HTS-25 FAST (a fast version of HTS-25), and PlatSil® HTS-40 (a medium-hard Shore A40). These silicones are pourable, but can be thickened with PlatThix Liquid Thickener or Fumed Silica to make brush-on molds.|
The NaturForm Series offers high-performing, natural molding latex rubbers that are most often used to make molds for casting plaster and concrete (e.g., veneer stone manufacturing and statuary). NaturForm products offer excellent tear strength and elongation properties and are available in 60-64% solid content options and a high solids option (70-74%). NaturForm 60-R has an internal release agent that assists in the release of casting materials, like concrete.
Select a NaturForm Latex to learn more:
|NaturForm™ 60||58-62%||White||9,500 - 10,500 cps|
|NaturForm™ 60-R (with internal mold release)||58-62%||Blue||5,000 - 6,000 cps|
|NaturForm™ 74||70-74%||White||9,000 - 15,000 cps|
|NaturForm™ 74-R (with internal mold release)||70-74%||Blue||17,000 - 20,000 cps|