PTFE-Free Coatings: Choosing Micronized Waxes for Scratch Resistance and Matting

Core Engineering Mechanism & Formulation Overview

Driven by the direction of PFAS regulation, a growing number of coating and ink formulators are evaluating fluorine-free alternatives to PTFE wax powders.

Removing PTFE from an established system is rarely a one-to-one swap. PTFE combines low friction, high thermal resistance and resistance to burnishing in one material. Non-fluorinated micronized waxes cover many of these functions, but the right choice depends on your cure conditions and the property you care about most.

This article explains what PTFE does in a film, what PE, oxidized PE, amide and PP micronized waxes can cover, and where trade-offs remain.

What Role Does PTFE Play in Coatings?

In coating and ink films, PTFE micronized wax mainly contributes three things:

1. Low friction and surface slip PTFE has very low surface energy, so contacting objects slide over the film instead of digging in.

2.Thermal resistance PTFE melts far above typical baking temperatures, so it stays solid through coil, can and powder cure cycles.

1. Resistance to burnishing and metal marking Rigid particles help limit glossy burnish marks on matte surfaces and grey marks left by metal objects rubbing on the film.

Knowing which of these matters most in your application is the starting point. If you mainly need slip and scratch resistance in ambient or low-bake wood coatings and inks, PE or modified waxes are often a suitable direction. If your process involves high-temperature baking or severe metal-marking conditions, grade selection needs more care.

What Can Each Type of Micronized Wax Cover?

No single non-fluorinated wax reproduces every PTFE property. The practical approach is to match polymer type, drop point, polarity and particle size to the property you need. The table lists the MILLWAX™ grades shown in our product brochure; please refer to the TDS for final specifications.

Beyond the table

PE-type waxes are the usual starting point for slip, rub resistance and anti-blocking in ambient-cure systems. Oxidized PE and modified grades are easier to incorporate into waterborne systems. Amide waxes bring toughness and abrasion resistance. PP waxes have a higher drop point and are often chosen where matting uniformity and burnish resistance are priorities. Actual performance varies with your formulation.

Applications and Trade-Offs

Wood coatings, UV and PU finishes

Usually the easier area for PTFE-free replacement. PE-type waxes for slip and scratch resistance, PP or amide waxes for matting uniformity and burnish resistance.

Note: in glossy clearcoats, pay attention to particle size and clarity. Changing wax type changes the surface distribution of the matting agent, so the wax-to-matting-agent ratio may need re-balancing to hold the target gloss.

Industrial coatings, overprint varnishes and inks PE-type, oxidized PE and amide waxes cover rub resistance, anti-blocking and slip.

Note: non-fluorinated waxes may need dosage or grade adjustment to reach a similar coefficient of friction; also consider overprint adhesion and foil stamping.

Coil and can coatings This is the most demanding scenario and calls for the most careful selection. Peak metal temperatures often exceed 200 °C, above the drop point of the PE, PP and amide waxes. Unlike PTFE, these waxes melt in the oven and recrystallize on cooling, so the cooling curve and quench conditions affect the final surface, gloss and metal-marking performance.

Powder coatings PE, PP and amide waxes can address surface mar resistance, anti-blocking and slip. The special texture effects of pure PTFE are harder to reproduce.

Note: gloss shift and recoat adhesion.

How We Work With You on Selection

Our technical team provides selection advice and a starting-dosage reference based on your system and performance targets, and follows up with adjustments based on your trial feedback.

To narrow down MILLWAX grades more accurately, it helps to share the following when you contact us:

• Resin and cure system: 2K PU, UV acrylate, waterborne acrylic/PUD, polyester/melamine coil, epoxy/polyester powder, etc.
• Dry film thickness.
• Cure temperature and time.
• Target performance: gloss, rub resistance, scratch resistance, coefficient of friction, etc.

TDS and SDS are available. Please contact us for samples and technical support →

Frequently Asked Questions (FAQ)

Q1: Can one PE micronized wax replace PTFE wax in every formulation?

No. PE waxes work well for slip, rub resistance and anti-blocking in ambient-cure systems, but their drop points (about 108–126 °C in our range) are far below PTFE. For high-bake or severe burnish conditions, PP, amide or composite grades are usually worth considering, selected according to your process conditions.

Q2: How does removing PTFE affect matting?

Wax type and particle size influence how the matting agent is distributed and the micro-roughness of the surface. After switching waxes, the wax-to-matting-agent ratio may need re-adjusting to hold the target gloss.

Q3: What particle size should I choose for clearcoats?

It depends on film thickness and gloss target. Coarse particles can reduce clarity and image sharpness, while very fine ones may stay buried in thicker films. Our technical team can advise based on your system.

Q4: What suits waterborne systems?

Standard PE and PP powders are hydrophobic and can be hard to wet in water. Oxidized PE (5006/5011/5018), amide (3101/3103/3106) and modified synthetic (8105) grades are listed as water-based or water/solvent-based in our brochure and are usually easier to wet; defoaming needs should be confirmed in your system. Pre-dispersed wax emulsions are another option.

Q5: How should metal marking be addressed?

Metal marking is the grey or dark trace left when metal objects rub on a coating. It relates to surface friction, roughness and hardness. A wax helps by lowering friction and improving mar resistance. Our technical team can help identify a suitable grade direction based on your bake and cooling conditions, and follows up with adjustments based on your trial feedback.

MILLWAX™ by Rallychem | Additive Technical Support, from Application Discussion to Reliable Mass Production.

As an ISO-certified micronized wax manufacturer, Rallychem supplies 100% PTFE-free micronized polyethylene wax (SAMWAX® PE-04) and amide-modified composite grades engineered for narrow D50/D90 particle size control in industrial wood, coil, and can coatings.