INDUSTRY COMPONENT

Pigment / Colorant

Pigments and colorants are specialized additives used to impart specific colors to Liquid Silicone Rubber (LSR) during manufacturing.

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Component Specifications

Definition
Pigments and colorants for Liquid Silicone Rubber are finely dispersed, thermally stable, and chemically inert particulate or liquid additives. They are incorporated into the LSR matrix to achieve uniform coloration without significantly altering the material's key properties, such as its elasticity, thermal stability, or curing behavior. These additives must be compatible with platinum-catalyzed or peroxide-cured LSR systems and are selected based on their opacity, dispersion quality, and resistance to migration and fading.
Working Principle
Colorants work by selectively absorbing and reflecting specific wavelengths of light. In LSR, they are uniformly dispersed within the polymer matrix during the mixing stage. The particles or dye molecules interact with the silicone base, becoming entrapped during the cross-linking (curing) process. This ensures the color is integral to the material, providing consistent hue and preventing bleeding or leaching in the final cured product.
Materials
Common materials include inorganic pigments (e.g., titanium dioxide for white, iron oxides for reds/yellows/browns, chromium oxides for greens), organic pigments (for brighter colors, but with potential thermal stability limitations), and pre-dispersed pigment masterbatches in silicone carrier fluids. Key specifications include particle size (<10 microns for good dispersion), thermal stability (>180°C for typical LSR processing), and chemical inertness to the LSR catalyst system.
Technical Parameters
  • Dosage Range 0.1% - 5.0% by weight
  • Particle Size <10 μm
  • Moisture Content <0.5%
  • Thermal Stability >180°C
  • pH (aqueous extract) 6-8
Standards
ISO 787-24, DIN 55949, ASTM D1208

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Pigment / Colorant.

LSR colorant silicone rubber pigment liquid silicone rubber coloring pigment for LSR color masterbatch LSR additive industrial coloring Pigment / Colorant Pigment / Colorant 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
  • Catalyst inhibition leading to poor cure
  • Color migration or bleeding
  • Reduced mechanical properties at high loadings
  • Batch-to-batch color inconsistency
  • Thermal degradation causing color shift
FMEA Triads
Trigger: Use of colorant containing amine or sulfur compounds.
Failure: Inhibition of platinum catalyst, resulting in uncured or tacky LSR parts.
Mitigation: Source only colorants specifically tested and certified for compatibility with addition-cure LSR systems. Conduct small-scale cure tests with new batches.
Trigger: Poor dispersion of pigment particles during mixing.
Failure: Speckled or non-uniform color, and potential weak points in the final part.
Mitigation: Use pre-dispersed masterbatches. Ensure adequate mixing shear and time. Verify dispersion quality microscopically.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Color match to standard must be within ΔE < 1.0 (CIELAB) under standard lighting (D65). Dosage tolerance typically ±5% of target weight.
Test Method
Color measurement via spectrophotometer (ASTM E308). Cure inhibition test per internal standards or supplier specifications. Thermal stability tested via TGA (Thermogravimetric Analysis).

Buyer Feedback

★★★★☆ 4.7 / 5.0 (11 reviews)

"As a professional in the Rubber and Plastic Product Manufacturing sector, I confirm this Pigment / Colorant meets all ISO standards."

"Standard OEM quality for Rubber and Plastic Product Manufacturing applications. The Pigment / Colorant arrived with full certification."

"Great transparency on the Pigment / Colorant components. Essential for our Rubber and Plastic Product Manufacturing supply chain."

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Frequently Asked Questions

What is the difference between a pigment and a dye for LSR?

Pigments are insoluble particles that sit in the LSR matrix, offering better opacity, lightfastness, and thermal stability. Dyes are soluble and can offer transparency but may have poorer migration resistance and thermal stability in silicone systems. Pigments are overwhelmingly preferred for industrial LSR applications.

How does the colorant affect the curing of LSR?

Poorly selected colorants can inhibit the platinum catalyst in addition-cure LSR systems, leading to incomplete curing or surface tackiness. It is critical to use colorants certified as 'platinum-friendly' or 'inhibitor-free' for such systems to ensure reliable processing and final part properties.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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