Liquid Silicone Resin

Product Specifications

Technical details and manufacturing context for Liquid Silicone Resin

Definition

Liquid silicone resin is a synthetic polymer material composed of siloxane chains with reactive functional groups. It exists as a pourable liquid at room temperature and undergoes cross-linking (curing) through heat, moisture, or catalysts to form a solid elastomer or resin. This material is characterized by its excellent thermal stability, chemical resistance, electrical insulation properties, flexibility across a wide temperature range, and low toxicity. It is used as a coating, adhesive, encapsulant, or molding material in various industrial applications.

Typical properties include a viscosity of 500–2000 cP (ASTM D2196), a cure time of 10–30 minutes, a Shore A hardness of 20–60 (ASTM D2240), a tensile strength of 2–8 MPa (ASTM D412), an elongation at break of 100–500% (ASTM D412), an operating temperature range of -50 to 200 °C, a dielectric strength of 15–25 kV/mm (ASTM D149), a volume resistivity of 1e14–1e16 Ω·cm (ASTM D257), a thermal conductivity of 0.2–0.3 W/(m·K) (ASTM C518), a specific gravity of 1.05–1.15 g/cm³ (ASTM D792), a shelf life of 6–12 months when stored in a sealed container below 30 °C, and a mix ratio of 1:1 by weight or volume. These values are typical ranges and must be verified for the specific product and application.

Liquid silicone resin is supplied as a two-part system that requires thorough mixing before use. It is commonly used in electrical insulation, potting, encapsulation, and molding applications. The material is not a finished product but a raw material that must be processed and cured. Always consult the manufacturer's technical data sheet for exact specifications and handling instructions.

Working Principle

Liquid silicone resin operates on the principle of addition-cure or condensation-cure polymerization. In the addition-cure system, typically involving platinum catalysts, the resin contains vinyl-functional groups that react with silicon-hydride (Si-H) cross-linkers upon heating, forming covalent bonds without producing by-products. In condensation-cure systems, reactive silanol (Si-OH) groups condense with cross-linkers, releasing small molecules like water or alcohol. The curing process transforms the low-viscosity liquid into a three-dimensional polymer network, resulting in a solid material with elastomeric or rigid properties depending on the formulation.

Common Materials

Polydimethylsiloxane (PDMS), Silica filler, Cross-linking agent, Catalyst (e.g., Platinum complex)

Technical Parameters

Parameter	Typical range	Notes & selection driver
ViscosityRequired	500–2000 cP	The resistance of the uncured resin to flow, measured at a specified temperature and shear rate.ASTM D2196
Cure TimeRequired	10–30 minutes	The time required for the resin to fully cross-link and achieve specified mechanical properties at a given temperature.
Shore HardnessRequired	20–60 Shore A	A measure of the cured material's resistance to indentation, indicating its softness or firmness.ASTM D2240
Tensile StrengthRequired	2–8 MPa	The maximum stress the cured material can withstand while being stretched before breaking.ASTM D412
Elongation at BreakRequired	100–500 %	The percentage increase in length of the cured material at the point of rupture under tension.ASTM D412
Operating Temperature RangeRequired	-50–200 °C	The temperature span within which the cured material maintains its functional properties without degradation.
Dielectric Strength	15–25 kV/mm	For electrical insulation applications.ASTM D149
Volume Resistivity	1e14–1e16 Ω·cm	High resistivity for electrical insulation.ASTM D257
Thermal Conductivity	0.2–0.3 W/(m·K)	Low thermal conductivity typical for silicones.ASTM C518
Specific Gravity	1.05–1.15 g/cm³	Density affects weight and cost.ASTM D792
Shelf Life	6–12 months	Store in sealed container below 30°C.
Mix Ratio	1:1	By weight or volume; ensure thorough mixing.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Base Polymer Part
Provides the primary siloxane backbone, determining basic properties like flexibility, thermal stability, and chemical resistance.

Material: Polydimethylsiloxane (PDMS) or modified silicone oligomers
Cross-linker Part
Contains reactive groups (e.g., Si-H for addition cure) that bond with the base polymer during curing to form a three-dimensional network.

Material: Organohydrosiloxane or other multifunctional silanes
Catalyst/Inhibitor System
Initiates and controls the curing reaction rate; inhibitors may be added to extend pot life or prevent premature curing.

Material: Platinum complex (for addition cure) or tin compound (for condensation cure)
Fillers Part
Enhance mechanical properties (e.g., strength, hardness), reduce cost, or modify thermal/electrical characteristics.

Material: Fumed silica, calcium carbonate, or other mineral powders
Additives Part
Provide specific functionalities such as color (pigments), UV resistance, flame retardancy, or adhesion promotion.

Material: Organic pigments, stabilizers, adhesion promoters

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Liquid Silicone Resin.

Manufacturers of Liquid Silicone Resin

Manufacturer profiles associated with Liquid Silicone Resin.

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Frequently Asked Questions

What is the typical cure time for liquid silicone resin?

The typical cure time is 10–30 minutes, but this depends on temperature, catalyst concentration, and the specific formulation. Always refer to the manufacturer's instructions for the exact curing schedule.

How should liquid silicone resin be stored?

Store in a sealed container below 30°C. The shelf life is typically 6–12 months. Avoid exposure to moisture and contaminants to prevent premature curing.

What is the mix ratio for liquid silicone resin?

The mix ratio is typically 1:1 by weight or volume. Ensure thorough mixing to achieve uniform properties. Use a scale or graduated cups for accuracy.

What are the key electrical properties of cured liquid silicone resin?

The cured material has a dielectric strength of 15–25 kV/mm and a volume resistivity of 1e14–1e16 Ω·cm, making it suitable for electrical insulation. Verify these values with the manufacturer for your specific application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 50 psi during application, cured part withstands up to 1000 psi compressive
flow rate:	0.1-10 mL/min for precision dispensing, viscosity-dependent
temperature:	-50°C to 250°C continuous, up to 300°C intermittent
slurry concentration:	Not applicable - pure resin system, can be diluted with compatible solvents up to 20% by volume

Product Specifications

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