Description

This is a castable, two-component, addition-curing silicone elastomer system. After mixing parts A and B in the correct proportions, the system will cure at ambient temperature within 24 hours, but the cure rate can be accelerated by applying heat. The cured rubber exhibits excellent physical and electrical properties.

Key Features

• Translucent for easy pigmentation
• Excellent flexibility
• Can be diluted with dimethyl solution with minimal bleeding
• Complies with FDA indirect food contact, regulation 21CFR 177.2600

Applications

• Special effects
• Animatronics
• Prosthetics
• Skin replication
• Pigmentable applications

Technical Specifications - Uncured Product

• Color A: Translucent white
• Color B: Translucent white
• Curing profile: RTV heat accelerated
• Curing type: Addition
• Release time / Full cure at 23°C/73°F: 6 - 8 hours
• Gel time at 25°C/77°F: 60 min
• Mixing ratio by weight: 1:1
• Processing time at 23°C/73°F: 20 minutes
• Rheology: Liquid
• Specific weight A: 1.09
• Specific weight B: 1.09
• Viscosity A Brookfield: 15,000 cP
• Viscosity B Brookfield: 15,000 cP

Technical Specifications - Cured Product

• Color: Translucent
• Elongation at break (ISO 37): 1000%
• Hardness Shore A (ASTM D 2240-95): 30
• Linear shrinkage (%): <0.1%
• Max working temperature: 204°C / 399°F
• Minimum operating temperature: -55°C / -67°F
• Tear resistance (BS ISO 34-1): 13.5 N/mm / 77 ppi
• Tensile strength (ISO 37): 3.49 N/mm² / 506 psi

Storage

• Max storage temperature: 38°C / 100°F
• Shelf life: 24 months

Usage and Curing Information

IMPORTANT: The "A" part of the product contains the platinum catalyst; great care must be taken when using automatic dispensing equipment. Ensure it is not contaminated by residual hydride-containing rubber in the dispensing equipment, as curing will occur. If in doubt, it is recommended to thoroughly flush the equipment with a suitable hydrocarbon solvent or silicone fluid.

Mix

Both "A" and "B" parts must be thoroughly stirred to ensure uniformity and to re-mix any settling of the fillers. Place the required amount of "A" and "B" parts by weight, in the mixing ratio indicated, in a clean plastic or metal container approximately three times their volume, and mix until the mixture is uniform in color.

For best results, we recommend degassing. Degassing is achieved by intermittent evacuation; the larger volume of the mixing vessel helps prevent overflow during this process. For automatic dosing with a static mixing head, the two components must be degassed before processing. Recommended vacuum conditions are 30-50 mbar, intermittently for 5-10 minutes.

Pour the mixture by gravity or pressure injection. For optimal performance, use the same lot numbers for both "A" and "B" sides.

Inhibition of Hardening

Great care must be taken when handling and mixing all addition cured silicone elastomer systems, ensuring that all mixing tools (drums and spatulas) are clean and made of materials that will not interfere with the curing mechanism.

Rubber curing can be inhibited by the presence of nitrogen, sulfur, phosphorus, and arsenic compounds; organotin catalysts and PVC stabilizers; epoxy resin catalysts; and even contact with materials containing some of these substances, such as molding clays, sulfur-cured rubbers, condensation-curing silicone rubbers, onions, and garlic.

Curing conditions

The data provides a guide to curing speeds at various temperatures. Mixing the components at temperatures between 15 and 25°C is recommended to ensure sufficient working time for degassing and handling. The working time can be extended to several hours by cooling the components before mixing.

Health & Safety

Safety data sheets available on request.

Packaging

CHT Moulding Rubbers are available in various packaging options, including bulk containers. Contact our sales department for more information.

Revision Date: 27 Feb 2023 | Revision No: 5 | Download Date: 06 Oct 2025