Momentive RTV3000F (45-Gram-Tube)

SILASTIC RTV-3100 Series (RTV-3110 / 3112 / 3120 Mold-Making Bases)

Overview

SILASTIC RTV-3100 Series are two-part, condensation-cure silicone rubber systems designed for general-purpose mold making, encapsulation, and potting applications. These pourable RTV materials cure at room temperature to form flexible, durable silicone rubber capable of capturing fine surface detail and operating across a wide temperature range.

Key Technical Specs

• Product Type: Two-part RTV silicone rubber (condensation cure)
• Available Grades: RTV-3110, RTV-3112, RTV-3120
• Mix Ratio: Typically 10:1 base to catalyst (varies by catalyst system)
• Viscosity: 130�280 poise (25�C, depending on grade)
• Specific Gravity: 1.14�1.45 (depending on grade)
• Colour (as supplied): White (3110/3112), Red (3120)
• Useful Temperature Range: -55�C to +300�C (depending on grade)
• Tensile Strength: 395�640 psi (depending on grade)
• Elongation: 127�170%
• Hardness: Shore A 45�58
• Dielectric Strength: 418�470 volts/mil
• Volume Resistivity: 2.72 � 10�? to 5.68 � 10�? ohm-cm

Approvals & Specifications

• Tested to ASTM D150, D149, D257 standards
• Manufactured under Dow product stewardship and regulatory compliance systems
• Designed for industrial, aerospace, and electronics-grade applications (non-medical, non-food use)

Typical Applications

• General-purpose mold making (simple patterns, low undercut geometries)
• Precision replication of master components
• Electronic potting and encapsulation
• Protective coating for assemblies and circuit boards
• Vacuum or non-vacuum casting processes
• Conformal coating for electronic assemblies

Compatibility & Safety Notes

• Requires compatible catalyst systems (e.g., RTV-3010-S, RTV-3000 F, DOWSIL� 4)
• Mix ratio variations affect cure speed and final mechanical properties
• Some catalyst systems may inhibit curing with certain polyester materials
• Vacuum de-airing recommended for most formulations (except RTV-3110 base in some cases)
• Maximum processing temperature should not exceed 35�C during mixing
• Not intended for medical, pharmaceutical, or food-contact use

Processing & Application Guidance

• Mix base and catalyst thoroughly until uniform dispersion is achieved
• Minimise air entrapment; vacuum degassing recommended for optimal results
• Pour in thin streams to reduce bubble formation during mold casting
• Allow full cure at room temperature; mechanical properties stabilise after ~7 days
• Post-cure schedules may be required for high-temperature confined applications

Why This Product is Chosen for Engineering / MRO Use

• Excellent reproduction of fine surface detail for tooling and mold replication
• Wide service temperature range suitable for harsh environments
• Adjustable cure speed allows flexible maintenance workflows
• High dielectric performance supports electronic insulation applications
• Good mechanical elasticity after cure for repeated demolding cycles

Practical Suggestions for Your Team (AOG / Engineering Context)

• Select RTV-3120 for highest temperature resistance applications
• Use RTV-3110 where low viscosity and easy mixing are priorities
• Choose RTV-3112 for balanced strength and flexibility requirements
• Maintain strict mix ratio control to ensure predictable curing behaviour
• Use vacuum degassing where void-free casting is critical
• Allow full 7-day cure for final mechanical and electrical properties

Manufacturer / Material Codes

• Product Family: SILASTIC� RTV-3100 Series
• Manufacturer: The Dow Chemical Company
• Base Types: RTV-3110 / RTV-3112 / RTV-3120
• Curing System: Condensation-cure silicone elastomer
• Primary Standards: ASTM D150, D149, D257

Alternative Names & Descriptions

• RTV silicone mold-making rubber
• Room temperature vulcanising silicone elastomer
• Two-part silicone casting compound
• Electronic potting silicone rubber
• Industrial silicone encapsulant system