Gelcoat Pigment Paste (Black, Universal)
Key Features
- High carbon black loading (30–40%) for deep jet-black coloration
- UV-absorbing carbon black provides incidental UV protection
- Sub-3 µm particle size for uniform dispersion
- Compatible with ortho, iso, and vinyl ester gelcoat bases
- Use for black, gray, and dark custom shades by blending
This black pigment paste is a high-concentration carbon black dispersion in a styrene-compatible polyester carrier for on-site pigmentation of clear gelcoats, laminating resins, and flowcoats. The carbon black is selected for deep jet-black color strength and UV absorption properties, making this paste suitable for both cosmetic coloring and providing some UV protection to the resin matrix. Carbon black particle size is sub-3 µm for smooth, uniform dispersion without agglomerates. Compatible with orthophthalic, isophthalic, and vinyl ester gelcoat bases. Carbon black concentration is 30–40% by weight. Addition rate: 1–5% of gelcoat weight for deep black coloration; even 0.5% additions create gray tones. Note that carbon black can slightly inhibit peroxide cure — increase MEKP by 0.2–0.3% when adding black paste above 3%. Stir thoroughly before use. Can be blended with white and color pastes for custom gray and tinted shades.
Specifications
| Parameter | Value |
|---|---|
| Carrier | Styrene-compatible polyester |
| Pigment | Carbon Black (sub-3 µm) |
| Shelf Life | 12 months (sealed) |
| Gel Time Effect | Slight inhibition >3%; increase MEKP by 0.2% |
| Carbon Black Content | 30–40% by weight |
| Addition Rate (deep black) | 2–5% of gelcoat weight |
Applications
FAQ
Carbon black particles act as free-radical scavengers, absorbing radicals generated by the peroxide/cobalt system and slowing the polymerization rate. This effect is more pronounced with high-surface-area carbon black grades. The inhibiting effect is manageable: for additions above 3% black paste, increase MEKP by 0.2–0.3% and ensure workshop temperature is above 18°C. Do not use carbon black paste in concentrations above 8% as cure may be severely inhibited.
Direct Contact
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