The Poly 75-90 liquid casting rubber is the hardest variant in Poly series polyurethae products. The Poly 75-90 has a Shore A 90 hardness. The two components RTV cast rubber has a mixing ratio of 2A:1B, a processing time of 10-15 minutes and a deforming time of 17 hours. The Poly 75-90 is also easy to thicken with a polyurethane thickener such as the CAB-O-SIL. The Poly 75-90 does have a high viscosity of 6.000 cP.
The Poly 75-90 is a hard rubber for making molds and between baffles for concrete, plaster or other heavy and large castings. Together with the Poly 75-75 and the Poly 75-80, the Poly 75-90 is also very suitable for hard rubber parts or applications. The Poly 75-90 adheres to many surfaces and surfaces. When no adhesion is required, the Pol-Ease 2300, Pol-Ease 2350 or release agent VL can be used.
Packaging: Set 612 kg, Set 3 kg, Set 15 kg, Set 54 kg
Hardness (Shore A): 90
Mix Ratio: 2A:1B
Working Time (min): 10-15
Total Cure (hr): 16 hr (demold) / 7 days (100%)
Viscosity (cP): 6.000
Color: White – Brown (creme – light brown)
Tear Strength (N/mm2): 64.44 kN/m (368 PLI)
Tensile Strength (N/mm2): 13.65 mPa (1.979 psi)
Type product: Polyurethane rubber