Pigment / Colorant: Dosage Range 0.1% - 5.0% by weight

Q: 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.

Q: 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.

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

Parameter	Typical range	Notes & selection driver
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

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

Standards

ISO 787-24, DIN 55949, ASTM D1208

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).

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Pigment / Colorant

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Specialized coating applied to molds to facilitate easy release of silicone seal rings during manufacturing.

Silicone Polymer Base

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Frequently Asked Questions

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