TGIC Polyester Powder Coatings: Excellent Durability, Corrosion Protection, Applications and Selection Guide
News 2026-07-15
TGIC powder coatings use TGIC as a crosslinking agent, providing coatings with outstanding weather resistance and mechanical properties. They are mainly used in outdoor metal facilities with strict weather resistance requirements, such as architectural aluminum profiles, outdoor furniture, automotive components, and highway guardrails.
This article systematically introduces the concept, characteristics, functions, application fields, selection considerations, and common problem solutions of TGIC powder coatings. It focuses particularly on the functions of TGIC powder coatings, helping readers better understand what TGIC powder coatings are, their key features, and their main application areas.
What Are TGIC Powder Coatings?
TGIC powder coating is a type of high-performance thermosetting powder coating that uses TGIC (Triglycidyl Isocyanurate) as the main crosslinking curing agent.
Thanks to the stable triazine ring structure and multifunctional characteristics of TGIC, these coatings are known for their excellent weather resistance. They can withstand long-term UV exposure and effectively resist chalking and fading.
At the same time, TGIC powder coatings also provide:
Excellent mechanical properties
Good heat resistance
Strong chemical stability
Features of TGIC Powder Coatings
The main features of TGIC powder coatings include:
- Excellent Weather Resistance
This is the most outstanding feature of TGIC powder coatings.
Thanks to the stable triazine ring structure of TGIC:
The coating can withstand long-term UV radiation.
It is resistant to chalking, fading, and gloss loss.
It provides long outdoor service life.
Therefore, TGIC powder coatings are the preferred system for applications requiring high weather resistance, such as:
Architectural aluminum profiles
Outdoor furniture
- Excellent Mechanical Properties
The coating provides:
Strong adhesion
Excellent impact resistance
Good flexibility
It can withstand:
Outdoor temperature changes
Mechanical stress
and is less likely to crack or peel.
- Good Heat Resistance and Chemical Resistance
TGIC powder coatings provide:
Good heat resistance (short-term high-temperature resistance)
Excellent resistance to chemical corrosion
They are suitable for:
Industrial environments
Complex outdoor conditions
- Stable Curing Conditions
Typical curing conditions:
180℃–200℃ × 10–15 minutes
Advantages:
Wide processing window
Low sensitivity to fluctuations in curing temperature and time
Less yellowing during over-baking
Easy application
- Rich Coating Appearance Options
TGIC powder coatings can provide various appearance effects, including:
High gloss
Matte
Sand texture
Wrinkle texture
Metallic effects
Meeting different design requirements.
- Environmental Performance (Relative)
As powder coatings:
Solvent-free
Zero VOC emissions
However, TGIC itself has toxicity concerns:
Classified as a suspected carcinogenic substance
GHS classification:
Acute toxicity Category 2
Skin sensitization Category 1
Therefore:
Strict protection measures are required during production and application.
Some European regions have introduced restrictions on TGIC usage.
- Good Storage Stability
TGIC powder coatings have:
Stable chemical properties at room temperature
Low tendency to agglomerate or deteriorate
Long storage life
Functions of TGIC Powder Coatings
The main functions of TGIC powder coatings include:
- Superior Weather Protection
This is the most important function of TGIC powder coatings.
TGIC coatings form an extremely stable protective layer under atmospheric conditions, effectively resisting:
UV radiation
Rain
Temperature changes
They prevent:
Chalking
Fading
Gloss loss
over long periods, significantly extending the service life of outdoor metal products.
- Excellent Mechanical Protection
TGIC powder coatings provide:
Excellent impact resistance
Strong adhesion
Good flexibility
They effectively protect substrates from mechanical damage during:
Transportation
Installation
Daily use
- Efficient Corrosion Protection and Chemical Resistance
TGIC coatings effectively isolate:
Moisture
Salt spray
Chemicals such as acid rain and detergents
preventing corrosion of metal substrates.
- Decorative Appearance Enhancement
TGIC powder coatings provide various decorative effects:
High gloss
Matte
Sand texture
Metallic finishes
They combine high-performance protection with aesthetic requirements for:
Buildings
Furniture
Industrial products
Application Fields of TGIC Powder Coatings
The main application fields of TGIC powder coatings include:
- Architecture and Building Materials Industry
This is the largest and most important application market for TGIC powder coatings.
Main applications:
Architectural aluminum profiles
Doors and windows
Curtain walls
Aluminum alloy roofs
Architectural decorative panels
Requirements:
Long-term outdoor exposure resistance
No chalking
No fading
Maintaining appearance quality
- Outdoor Public Facilities
Applications include:
Highway guardrails
Traffic barriers
Street light poles
Park fences
Outdoor advertising boards
Communication base station housings
These products are exposed to:
Rain
UV radiation
for long periods and require excellent weather resistance.
- Automotive and Transportation Industry
Applications include:
Aluminum alloy wheels
Roof racks
Exterior automotive components
Engine surrounding components
TGIC powder coatings provide:
Weather resistance
Stone chip resistance
Corrosion resistance
- Outdoor Furniture and Leisure Products
Applications include:
Outdoor furniture:
Tables
Chairs
Umbrella frames
Gardening tools:
Lawn mowers
Garden scissors
Outdoor sports equipment:
Fitness facilities
These products require both:
Attractive appearance
Long-term outdoor durability
How to Select TGIC Powder Coatings
- Consider Application Environment
(1) High-End Outdoor Applications
Examples:
Architectural aluminum profiles
Curtain walls
Select:
High weather-resistant grades
Requirements:
QUV ≥2000 hours
Gloss retention ≥90%
(2) General Outdoor Applications
Examples:
Outdoor furniture
Guardrails
Select:
Standard weather-resistant grades
Requirements:
QUV ≥1000 hours
Gloss retention ≥80%
(3) Indoor / Semi-Outdoor Applications
Can select:
TGIC/HAA hybrid systems
Pure HAA systems
to reduce cost.
- Consider Mechanical Properties
(1) High Flexibility / Impact Resistance
Examples:
Outdoor furniture
Recommended:
Medium-low acid value polyester resin
(Acid value: 30–35)
(2) High Hardness / Wear Resistance
Examples:
Aluminum profiles
Recommended:
High acid value polyester resin
(Acid value: 50–70)
(3) Balanced Performance
Can be achieved through:
Resin blending
Toughening additives
- Consider Formula Quality
Confirm the following key parameters from suppliers:
(1) TGIC Epoxy Equivalent
≤110 mol/100g
(High activity)
(2) TGIC Chlorine Content
≤0.2%
(Premium grade, affects weather resistance)
(3) TGIC Addition Level
Normally:
7%–8% of polyester resin weight
(calculated according to polyester acid value)
(4) Pigments and Fillers
For exterior applications:
Use R996-grade titanium dioxide
Weather resistance pigment grade ≥7
- Consider Application Conditions
(1) Curing Conditions
Normal:
180–200℃ × 10–15 minutes
For limited production lines:
Low-temperature TGIC systems:
Approximately 160℃
(2) Pretreatment Compatibility
Confirm compatibility with:
Phosphating
Chromating
Silane treatment
(3) Thick Film Application Advantage
TGIC systems:
≥100 μm thick coating
Less prone to pinholes
Suitable for thick-film applications.
- Consider Cost Alternatives
(1) Pure TGIC System
Advantages:
Best weather resistance
Excellent thick-film performance
Disadvantages:
Higher cost
Toxicity concerns
Applications:
High-end architectural profiles.
(2) TGIC/HAA Hybrid System
Advantages:
Moderate cost
Improved environmental performance
Disadvantage:
Slightly reduced weather resistance
Applications:
General outdoor products.
(3) Pure HAA System
Advantages:
Lowest cost
Non-toxic and environmentally friendly
Disadvantage:
Pinhole risk in thick coatings
Applications:
Cost-sensitive products.
- Consider Safety and Compliance
(1) Toxicity Risk
TGIC has:
Skin irritation risk
Sensitization risk
Operators must wear:
Protective equipment
Gloves
Respiratory protection
Spray areas require ventilation systems.
(2) Regulatory Restrictions
For exports:
Europe: confirm local TGIC restrictions.
USA: confirm TSCA compliance requirements.
(3) Operating Procedures
Establish:
TGIC-specific operating SOPs
Regular workplace TGIC concentration monitoring
Common Problems and Solutions of TGIC Powder Coatings
- Poor Adhesion / Coating Peeling Problems
Causes:
Poor pretreatment:
Oil contamination
Oxide film
Poor conversion coating
Insufficient curing
Incorrect TGIC addition level
Solutions:
Strictly control pretreatment:
Degreasing → Water washing → Passivation → Water washing
Use oven temperature recorder to confirm:
180–200℃ × 10–15 minutes
Accurately calculate TGIC addition:
Normally:
7%–8% of polyester resin weight
- Poor Impact Resistance / Flexibility Problems
Causes:
Excessive TGIC content causing excessive crosslink density
Insufficient polyester flexibility
Over-curing
Solutions:
Control TGIC addition accurately.
Select flexible polyester resin.
Avoid over-baking.
Add toughening additives if necessary.
- Poor Weather Resistance Problems
Causes:
Incorrect non-weather-resistant polyester resin
Poor TGIC quality
High chlorine content
Insufficient pigment weather resistance
Incomplete curing
Solutions:
Use outdoor weather-resistant polyester resin.
TGIC chlorine content ≤0.2%.
Use R996 titanium dioxide.
Select pigments with light fastness ≥Grade 7.
Ensure complete curing.
- Crater Problems
Causes:
Poor degreasing
Oil/water contamination in compressed air
Silicone contamination
Poor TGIC/polyester compatibility
Solutions:
Strengthen degreasing control.
Install efficient oil-water separators.
Prevent silicone materials from entering workshops.
Replace with better compatible resin or TGIC batches.
- Pinholes Problems
Causes:
Excessive coating thickness
Gas trapped in castings
TGIC/polyester reaction too fast
Solutions:
Control coating thickness:
60–80 μm
Preheat castings before spraying.
Adjust curing curve:
First low-temperature leveling → then high-temperature curing
- Yellowing Due to Over-Baking
Causes:
Excessive curing temperature
Excessive curing time
Heat-sensitive formulation components
Solutions:
Strictly control curing window.
Use yellowing-resistant formulations.
- Powder Storage Agglomeration Problems
Causes:
Slow reaction between TGIC and polyester at room temperature
Excessive storage temperature and humidity
Solutions:
Store below 25℃ in a cool, dry environment.
Follow FIFO inventory management.
Dispose of severely agglomerated powder.
- Operator Skin Allergy / Respiratory Irritation Problems
Causes:
TGIC has:
Skin sensitization properties
Irritation risks
(GHS classification: Acute Toxicity Category 2 / Skin Sensitization Category 1)
Solutions:
Operators must wear:
Protective gloves (nitrile or neoprene)
Dust masks (N95 or higher)
Protective clothing
Spray areas should have:
Effective ventilation systems
Regular TGIC air concentration monitoring
Recommended:
≤0.1 mg/m³
Additional requirements:
Establish TGIC-specific operating SOPs.
Prevent unprotected personnel from contact.
Avoid dust generation when changing powders.
Use closed powder feeding systems.
If allergic symptoms occur:
Immediately stop exposure.
Seek medical attention.
Since TGIC usage is partially restricted in the EU, export products must comply with destination regulations.
If you encounter difficult problems during the application of TGIC powder coatings, please feel free to contact us for professional technical support. We are willing to discuss solutions together, promote the development of the powder coating industry, and provide effective assistance.
We hope this article provides a professional and reliable reference for the powder coating industry.
We sincerely welcome your inquiries regarding powder coating product performance, industry standards, application methods, precautions, or any related questions. Please feel free to leave a message or contact us directly. We look forward to providing you with detailed product information, demonstration videos, or customized solutions to help you fully understand the functions and advantages of our products.
