TGIC vs TGIC-Free Polyester: What the Difference Means

When buyers compare polyester powder coatings, the abbreviation TGIC appears on technical data sheets, and so does the phrase TGIC-free. The two describe how the polyester resin is crosslinked, and the choice affects compliance, availability and in some cases performance. Here is what the difference actually means when you specify powder for outdoor or industrial parts.

What TGIC Is

TGIC – triglycidyl isocyanurate – is a crosslinker widely used in polyester powder coatings. It reacts with the resin in the curing oven to form a durable network, which is why TGIC polyesters have been a standard for decades in architectural and industrial coating.

Why TGIC-Free Systems Exist

TGIC in powder form carries a hazard classification in the EU (H351 – suspected of causing cancer if inhaled) and therefore requires hazard labelling and handling precautions. Because of this, European producers moved to TGIC-free crosslinkers, and TGIC-free polyester is now the default in much of the world. The classification concerns powder handling, not the cured film on your parts.

Performance: What Actually Differs

Modern TGIC-free polyesters match TGIC systems on outdoor weatherability, gloss retention, mechanical strength and cure response when formulated well. Early TGIC-free formulas were weaker on weathering and flexibility, which is why the reputation that TGIC is stronger still persists. A current TGIC-free super-durable polyester passes the same QUV, salt spray and impact tests as its TGIC counterpart.

Quick Comparison

• Outdoor durability: equivalent in current formulations
• Mechanical properties: equivalent for most architectural and industrial parts
• Compliance: TGIC-free avoids the H351 hazard classification and related labelling
• Availability: TGIC-free is the default in Europe; TGIC remains common in other markets
• Cost: comparable; it depends on the specific formulation and weathering grade

Where Each Is a Safe Choice

• Architectural aluminium and facades: TGIC-free super-durable polyester
• Fencing, outdoor furniture and street furniture: either system, depending on market compliance
• Industrial equipment and enclosures: TGIC-free polyester or hybrid
• Markets with strict chemical labelling rules: prefer TGIC-free

How to Specify It Correctly

Do not specify polyester alone. Confirm the crosslinker type on the technical data sheet, the cure schedule for your oven, and the weathering claim – for example QUV hours or an architectural warranty. A written specification that names the system prevents confusion at the quoting stage and makes incoming inspection objective.

Common Myths

• Myth: TGIC-free means lower quality. Fact: current TGIC-free polyesters meet the same architectural and industrial standards
• Myth: TGIC is banned. Fact: it is regulated and labelled in some markets, not banned globally
• Myth: you can switch between them without re-approval. Fact: cure response and gloss can differ, so approve samples first

Ask Our Engineers

If your parts will be exposed to weather or strict compliance requirements, send us the application details and target market. We will confirm the right polyester system – TGIC or TGIC-free – with the technical data sheet, samples and batch test records before you commit.