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White laser marking on black ABS molded parts is widely used in consumer electronics, automotive interiors, and household appliances for logos, serial numbers, and decorative patterns. However, yellowing, blurry marks, and surface charring are common pain points that ruin product appearance and consistency. This guide shares practical, production-ready solutions to achieve bright, pure white laser marks on black ABS without yellowing, covering material selection, formula optimization, additive usage, and laser parameter tuning.

White Laser Matking on ABS

1. Choose Premium Raw ABS Materials. Material quality is the foundation of yellowing-free laser marking. Recycled ABS contains residual impurities, uneven components, and inconsistent heat resistance, which easily cause yellowing and fuzzy white marks during laser processing. Always use virgin transparent ABS resin for black molded parts. Its pure molecular structure ensures uniform laser reaction, stable foaming effect, and clean white marking without thermal discoloration. Meanwhile, avoid adding extra carbon black or black pigments. Excessive black fillers disrupt laser energy absorption, leading to partial overheating and yellowing defects.
2. Adopt Professional Laser Marking Masterbatch Ordinary ABS cannot form high-brightness white marks stably. Special laser marking masterbatches are essential for black-on-white marking. DOME MATERIALS’ DM-GB0051 and DM-GB0181 are tailor-made for ABS white laser marking. These dedicated additives trigger uniform micro-foaming under laser radiation, forming a dense light-reflective layer for vivid, high-contrast white marks while effectively preventing thermal yellowing. Control the masterbatch dosage strictly at 1–2% of the total material weight; 1.5% is the optimal dosage for balanced marking performance and material toughness.
3. Avoid Flame Retardants & Optimize Formula. Flame-retardant additives are a major cause of dull white marks and yellowing on ABS. They alter the laser thermal reaction mechanism, inhibiting uniform foaming and causing uneven, yellowish marking. For pure white laser marking requirements, never add flame retardants to the ABS formula. Adding an appropriate proportion of PMMA significantly improves mark whiteness, scratch resistance, and uniformity. The proven optimal formula is 70% transparent virgin ABS + 30% PMMA + 1.5% laser marking masterbatch, delivering bright white, durable, yellowing-free marking results.
4. Optimize Laser Marking Parameters. Improper laser parameters cause overheating, melting, and yellowing. Based on mainstream 20W fiber laser marking machines, the reference optimal parameters are: 20% power, 3000 marking speed, 35% frequency, and 0.04mm line spacing. These low-energy, high-uniformity settings avoid excessive heat accumulation and prevent yellowing. Note: Laser machine performance varies daily due to aging and calibration differences. Always test and fine-tune parameters before mass production to ensure stable, consistent white marking effects. Conclusion: Yellowing-free white laser marking on black ABS relies on standardized material formulas and precise parameter control. By using transparent virgin ABS, professional laser masterbatch, flame-retardant-free formulas, PMMA blending optimization, and matched laser parameters, manufacturers can achieve high-brightness, scratch-resistant, non-yellowing white marks for high-quality ABS molded products