INDUSTRY COMPONENT

Cross-linker (Part B)

Cross-linker (Part B) is a chemical component used in liquid silicone rubber (LSR) manufacturing to initiate and control the curing process through platinum-catalyzed addition reactions.

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Component Specifications

Definition
Cross-linker (Part B) is a critical reactive component in two-part liquid silicone rubber (LSR) systems, typically containing platinum catalysts and inhibitors. When mixed with Part A (base polymer with vinyl groups), it initiates a hydrosilylation reaction that forms cross-links between silicone polymer chains, transforming the liquid mixture into a solid elastomer with specific mechanical, thermal, and chemical properties.
Working Principle
Works through platinum-catalyzed hydrosilylation reaction where silicon-hydride (Si-H) groups in Part B react with vinyl (Si-CH=CH2) groups in Part A. The platinum catalyst facilitates the addition of Si-H across the carbon-carbon double bond, creating covalent Si-C bonds that connect polymer chains into a three-dimensional network. Reaction rate is controlled by inhibitors that temporarily deactivate the catalyst until heat is applied.
Materials
Typically contains: Polysiloxane with silicon-hydride functional groups (30-70%), Platinum catalyst complex (50-500 ppm platinum), Reaction inhibitors (e.g., vinyl siloxanes, acetylene derivatives), Inert fillers (optional, for viscosity adjustment), Stabilizers (for shelf life).
Technical Parameters
  • Cure_time 30-300 seconds
  • Shelf_life 6-12 months (unopened, 25°C)
  • Si-H_content 0.1-1.5 mol/kg
  • Viscosity_25C 500-5000 mPa·s
  • Pot_life_mixed 2-48 hours
  • Cure_temperature 100-180°C
  • Mixing_ratio_A_B 1:1 typically (varies by formulation)
  • Platinum_content 50-500 ppm
  • Specific_gravity 0.95-1.05
Standards
ISO 10993, ISO 16256, DIN 53504, ASTM D5289

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Cross-linker (Part B).

LSR cross-linker silicone curing agent Part B component platinum catalyst liquid silicone rubber hydrosilylation two-part silicone elastomer curing polymer cross-linking Cross-linker (Part B) Cross-linker (Part B) in Rubber and Plastic Product Manufacturing

Parent Products

This component is used in the following industrial products

Liquid Silicone Rubber

A two-part, platinum-catalyzed silicone elastomer that cures at elevated temperatures to form durable, flexible rubber parts.

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Engineering Analysis

Risks & Mitigation
  • Premature curing if contaminated
  • Platinum catalyst poisoning by sulfur/amine compounds
  • Exothermic reaction if mixed incorrectly
  • Shelf life degradation if stored above 25°C
FMEA Triads
Trigger: Catalyst poisoning from contaminated equipment
Failure: Incomplete curing, tacky surface
Mitigation: Implement strict cleaning protocols, use dedicated equipment, test raw materials
Trigger: Incorrect mixing ratio
Failure: Poor mechanical properties, dimensional instability
Mitigation: Automated metering systems, ratio verification sensors, regular calibration
Trigger: Moisture absorption during storage
Failure: Reduced reactivity, bubble formation
Mitigation: Sealed containers, desiccant packs, controlled humidity storage

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Mixing ratio ±1%, platinum content ±10%, viscosity ±15%
Test Method
FTIR for Si-H content, ICP-OES for platinum, rheometry for cure characteristics, ISO 16256 for biocompatibility (medical grades)

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What happens if Cross-linker Part B is contaminated with moisture?

Moisture causes premature hydrolysis of Si-H groups, reducing cross-linking efficiency and potentially causing incomplete curing, bubbles, or weak spots in the final product.

Can different brands of Part B be mixed with Part A from another manufacturer?

No, cross-linkers are formulation-specific. Mixing components from different systems typically results in improper curing, poor mechanical properties, or complete failure.

How is pot life extended in LSR systems?

Through inhibitors that temporarily bind to platinum catalyst. Heat during molding releases the inhibitor, allowing the reaction to proceed at controlled rates.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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Cross-linker Cross-linking Agent