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Cross-linker Component – Rubber and Plastic Product Manufacturing

Component Specifications

Definition

A cross-linker is a chemical compound that reacts with functional groups on silicone polymer chains to form covalent bonds between them, creating a three-dimensional network. In liquid silicone resin systems, it is essential for converting the liquid prepolymer into a solid elastomer with enhanced mechanical strength, thermal stability, and chemical resistance.

Working Principle

The cross-linker contains reactive groups (e.g., Si-H, vinyl) that undergo addition or condensation reactions with complementary groups on the silicone base polymer. Under heat or catalyst, these reactions form cross-links, transforming the linear polymer into a network structure.

Materials

Typically organosilicon compounds such as methylhydrogen polysiloxane or vinyl-terminated siloxanes; purity >99%; viscosity 10-100 mPa·s at 25°C.

Technical Parameters

Density 0.95-1.05 g/cm³
Shelf Life 12 months
Flash Point >100°C
Reactive Groups Si-H or Vinyl
Viscosity (25°C) 10-100 mPa·s

Standards

ISO 10993, DIN 53504

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cross-linker.

Parent Products

This component is used in the following industrial products

Liquid Silicone Resin

A low-viscosity, flowable silicone polymer that cures to form a durable, flexible, and heat-resistant solid.

View Product Details

Engineering Analysis

Risks & Mitigation

Skin irritation
Flammable if exposed to open flame
Reacts exothermically with catalysts

FMEA Triads

Trigger: Insufficient mixing ratio
Failure: Incomplete curing, soft or tacky surface
Mitigation: Use precise metering equipment and verify ratio via rheology

Trigger: Contamination with moisture
Failure: Premature gelation or bubbles
Mitigation: Store in sealed containers under dry nitrogen

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.5% of specified viscosity

Test Method

ASTM D2196 for viscosity; FTIR for functional group verification

Buyer Feedback

★★★★☆ 4.9 / 5.0 (29 reviews)

"Found 47+ suppliers for Cross-linker on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Cross-linker is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Rubber and Plastic Product Manufacturing environments. No issues with the Cross-linker so far."

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Frequently Asked Questions

What is the typical dosage of cross-linker in liquid silicone resin?

Typically 1-5% by weight of the base polymer, depending on desired hardness and crosslink density.

Can this cross-linker be used for platinum-catalyzed systems?

Yes, if it contains vinyl groups; for Si-H cross-linkers, a platinum catalyst is required.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Cross-linker