Introduction

During the production of transparent PET, APET, PVC and PP plastic sheets, cosmetic boxes, food packaging containers and blister rolls, finished products are easily damaged by surface scratches, sheet blocking, friction whitening, slitting drawing and transport abrasion, which greatly downgrade product quality and increase reject rate.Manufacturers widely add anti-scratch agent (scratch-resistant masterbatch) and slip agent (slip masterbatch) into raw materials during extrusion to solve these defects fundamentally. This article elaborates the definition, working principle, classification, application and dosage of the two functional additives, providing material selection guidance for plastic sheet and rigid box factories.

1. What Is Anti-Scratch Agent for Plastic Sheets

Anti-scratch agent, also called scratch-resistant masterbatch or abrasion-resistant additive, is a modified functional material for transparent plastic sheets. It is compounded with carrier resin, silicone, fluoropolymer, nano inorganic powder and high-molecular wear-resistant components, and mixed with base resin for sheet co-extrusion.

Core Working Mechanism

Improve surface abrasion resistance of plastic, disperse friction energy and reduce micro scratches caused by hard objects;

Inhibit scratch whitening and haze, maintain high transparency and gloss of clear sheets;

Enhance surface toughness to avoid permanent scratches during slitting, folding and transportation;

Cooperate with slip agent to double reduce surface abrasion.

Main Types & Compatible Materials

Silicone anti-scratch masterbatch: Ideal for PET, APET and PVC sheets, low bloom, no negative impact on printing & UV coating, top choice for cosmetic packaging boxes;

Fluoropolymer anti-scratch additive: Superior friction resistance, stable long-term performance without migration, for high-end electronic packaging;

Nano powder anti-scratch material: Silicon dioxide & alumina based, boost surface hardness, suitable for PP blister sheets and thin rolls;

Multi-functional composite anti-scratch masterbatch: Integrate anti-scratch & mild slip performance to simplify formula.

Recommended Dosage

0.3%–1.0% during sheet extrusion; up to 1.2% for ultra-high abrasion resistant packaging.

2. What Is Slip Agent for Plastic Sheets

Slip agent, also known as anti-block masterbatch or opening agent, is a functional additive to lower surface friction coefficient and eliminate sheet blocking & demolding difficulty. It is divided into powder slip additive and pellet slip masterbatch, an essential material for mass production of transparent plastic sheets.

Core Working Mechanism

Slip components disperse evenly in resin during melting, then migrate to sheet surface after cooling to form an ultra-thin lubricating film:

Lower friction between sheet layers to prevent roll blocking and easy unwinding;

Reduce drawing marks from extruder die and traction rollers for smoother sheet surface;

Smooth folding, die-cutting and blister forming without cracking or streaking;

Improve mold release performance for thermoforming and raise production speed.

Main Types & Compatible Materials

Fatty acid amides (Oleamide, Erucamide, EBS): Cost-effective, excellent anti-block performance for PP & PE sheets;

Silicone slip masterbatch: High clarity, low bloom, perfect for PET, APET and PVC without interfering with screen printing & UV varnish;

Composite slip & anti-block masterbatch: Integrate slip, anti-block and mild anti-scratch functions for one-step mixing;

Food-contact grade slip agent: Compliant with food safety standards for snack and fresh food packaging boxes.

Recommended Dosage

PET/PVC clear rigid boxes: 0.2%–0.6%; PP blister sheets: 0.15%–0.4%. Excessive addition will cause surface haze and weaken printing adhesion.

3. Difference & Matching Rule Between Anti-Scratch Agent & Slip Agent

Many factories confuse the two additives, which are complementary and cannot replace each other:

Slip Agent: Focus on smooth processing, anti-blocking and easy production by reducing friction coefficient;

Anti-Scratch Agent: Focus on surface protection, scratch resistance and anti-whitening to upgrade finished product appearance.

Standard Matching Formula for Clear Packaging Boxes

PET/APET cosmetic boxes: 0.3% silicone slip masterbatch + 0.5% silicone anti-scratch masterbatch

PP food blister sheets: 0.2% EBS slip agent + 0.4% nano powder anti-scratch material

PVC folding boxes: 0.6% integrated slip & anti-scratch composite masterbatch (simplify mixing process)

4. Advantages of Adding Anti-Scratch & Slip Agent

Premium Appearance: No transport scratches or friction haze, high transparency for high-margin packaging;

Higher Production Efficiency: Anti-block rolls, easy unwinding, no folding streaks, over 30% reject rate reduction;

Wide Process Compatibility: Low-bloom premium masterbatch works well with UV printing, hot stamping and embossing;

Universal Material Compatibility: Fits PET, APET, PVC, PP and PETG packaging sheets;

Safe & Compliant: Odor-free food-grade formulas available for food, baby care and cosmetic packaging.

5. Key Usage Notes

Strictly control dosage; excess slip agent leads to surface bloom and poor printing adhesion;

Choose high heat-resistant silicone series for high-temperature extrusion to avoid yellowing;

Select low-migration masterbatch for printing and hot stamping products;

Conduct small batch trial before mass production to test transparency, scratch resistance and printing compatibility.

Conclusion

Anti-scratch agent and slip agent are core functional additives for transparent plastic sheets and rigid packaging boxes. Used separately, they solve respective production defects; matched together, they optimize both processing performance and finished surface quality. Selecting customized masterbatch for your base material effectively eliminates scratch, blocking and whitening issues, and strengthens market competitiveness of your packaging products.