Brand Silastic Application Type Mold-Making 1 Part or 2 Part 2 Part Material Form Liquid Manufacturer Dow Chemistry Silicone rubber Cure Method Base/Curing agent Cure Temperature (°C) 20 to 25, 25, 20 to 25 Cure Time (min) Fast, 1,440, 480 Viscosity (cPs) 13,500, Pourable Density (g/cm³) 0.001
Technical Data for Dow Silastic P-1 RTV Silicone Rubber
Cure Temperature (°C) 20 to 25, 25, 20 to 25 Cure Time (min) Fast, 1,440, 480 Viscosity (cPs) 13,500, Pourable Test Method Linear Shrinkage (%) 0.10 Test Method Mix Ratio 10:1 (by volume), 100:10 (by weight)
General Bond Strength (psi) High Tear Strength (piw) 131 (ppi), 23 (kN/m), High, Tear Resistance Test Method Tensile Strength (psi) 1,087, 7.5 (Mpa), 377, 261, 217, 217 Test Method
Shore A Hardness 25, Medium Test Method Elongation (%) 9 Test Method Flexibility Flexible
Flash Point (°F) 140.0 Density (g/cm³) 0.001 Test Method
Shelf Life Details When stored at or below 25°C (77°F) in the original unopened containers, Silastic P-1 Base and SILASTIC P-1 Curing Agent have a usable life of 12 months from the date of production. SILASTIC P-1 Curing Agent can be sensitive to moisture and contamination. Keep in original vented container and ensure it is well closed after use. Shelf Life Type from the date of production Shelf Life (mon) 12
Not Good For
Don't Use For food molding, dental, human skin molding applications
Best Practices for Dow Silastic P-1 RTV Silicone Rubber
The surface of the molds in which the print pads are being cast should be clean and free of loose material.
In all cases, it is advisable to check before casting that no adhesion occurs between the cured SILASTIC P-1 and the mold.
Pour the mixed base and curing agent as soon as possible into the mold, avoiding air entrapment.
Weigh 100 parts of SILASTIC P-1 Base and 10 parts of SILASTIC P-1 Curing Agent (see handling precautions) in a clean container, then mix together until the curing agent is completely dispersed in the base. Hand or mechanical mixing can be used, but do not mix for an extended period of time or allow the temperature to exceed 35°C (95°F). Mix sufficiently small quantities to ensure thorough mixing of the base and curing agent.
It is strongly recommended that entrapped air be removed in a vacuum chamber, allowing the mix to completely expand and then collapse. After a further 1-2 minutes under vacuum, the mix should be inspected and if free of air bubbles, can then be used. A volume increase of 3-5 times will occur on vacuum de-airing the mixture, so a suitably large container should be chosen.
The base/curing agent ration MUST be between 100:9.5 and 100:10.5.
The catalyzed material will cure to a flexible rubber within 8 hours at room temperature (22-24°C/71.6-75.2°F) and the pad can then be removed. If the working temperature is significantly lower, the cure time will be longer. Heat acceleration the cure is possible.
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Linear Shrinkage Test Methods
|Linear Shrinkage||Test Method||Temp|
|0.10 %||Cured for 24 hours at 25°C (77°F)||25°C|
Viscosity Test Methods
|13,500 cPs||Base and curing agent mixture (100:10 by weight)|
Tensile Strength Test Methods
|Tensile Strength||Cure Time||Cure Temperature|
|1,087 psi||1,440 min||25°C|
|7.5 (Mpa)||1,440 min||25°C|
Tear Strength Test Methods
|Tear Strength||Cure Time||Cure Temperature||Test Method|
|131 (ppi)||1,440 min||25°C||Die B|
|23 (kN/m)||1,440 min||25°C||Die B|
Elongation Test Methods
|9 %||Cured for 24 hours at 25°C (77°F)|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method||Hardness Temperature|
|25||Cured for 24 hours at 25°C (77°F)||25°C|
Density Test Methods
|0.001 g/cm³||25°C||Cured for 24 hours at 25°C (77°F)|