Dow Silastic P-1 RTV Silicone Rubber

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Description for Dow Silastic P-1 RTV Silicone Rubber

High tear strength, suited for production of print pads, can be colored.

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

Best Practices for Dow Silastic P-1 RTV Silicone Rubber

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Technical Data for Dow Silastic P-1 RTV Silicone Rubber

*See Terms of Use Below

Overview

Application Type
- Casting / Moldmaking - Mold-Making
1 Part or 2 Part
- 2-Part
Material Form
- Liquid
Chemistry
- Silicone - Silicone rubber
Cure Method
- 2-Part Cure - Base/Curing agent
Brand
- Silastic

Specifications

Cure Specs

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)

Bond Strength

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

Hardness

Shore A Hardness	25, Medium	Test Method
Elongation (%)	9	Test Method
Flexibility	Flexible

Other Properties

Flash Point (°F)	140.0
Density (g/cm³)	0.001	Test Method

Business Information

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

*See Terms of Use Below
1. Surface Preparation
  
  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.
2. Application
  
  Pour the mixed base and curing agent as soon as possible into the mold, avoiding air entrapment.
3. Mixing
  
  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.
4. Deairing/Degassing
  
  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.
5. Curing
  
  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.
Comparable Materials for Dow Silastic P-1 RTV Silicone Rubber

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Spec Engine^® Results
- Silastic S-2 RTV Silicone Rubber(Dow)
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- Silastic V RTV Silicone Rubber(Dow)
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- Koeraform A 42(CHT)
  A pourable two-part, casting compound, addition cure silicone elastomer system, cure at ambient temperatures within 24 hours, exhibits excellent physical and electrical properties.
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