Choosing raw materials for powder coating formulations begins with the finished coating requirement. Resin, curing agent, pigment, filler, and Additives should be selected as one interacting system. Starting with a preferred raw material and attempting to force it into every application often creates unstable processing or weak finished-film performance.

The most efficient approach is to convert the customer’s application into measurable technical targets before building the formula.

Step 1: Define the Substrate

Identify whether the powder will be applied to:

• Aluminum

• Carbon steel

• Galvanized steel

• Cast metal

• Stainless steel

• Heat-sensitive material

• Previously coated components

Substrate chemistry, surface condition, mass, and pretreatment affect adhesion, degassing, corrosion protection, and cure response.

Cast parts may release trapped gases during baking. Galvanized surfaces can create adhesion or outgassing challenges. Heavy steel components require more time to reach the specified metal temperature.

Step 2: Identify the Exposure Environment

An indoor indoor filing cabinet and an outdoor architectural panel need different resin systems.

Record exposure to:

1. Sunlight

2. Rain and humidity

3. Salt or industrial pollution

4. Chemicals

5. Heat

6. Abrasion

7. Cleaning agents

8. Impact

9. Electrical conditions

10. Food-contact or other regulated environments

Select pure polyester for many exterior applications, epoxy for protective indoor and functional coatings, hybrids for general indoor finishes, and silicone-containing systems where higher thermal performance is required.

Step 3: Match the Resin and Curing Agent

The resin supplies the film-forming backbone. The curing agent creates the crosslinked network.

For polyester systems, the curing-agent ratio depends on the resin’s acid value and the curing agent’s reactive equivalent. TGIC and HAA are not direct drop-in replacements. They can require different resin designs, formulation ratios, degassing strategies, film thicknesses, and curing conditions.

Epoxy resin also needs a compatible curing route selected for the required reactivity, storage stability, and film performance.

Our powder coating curing agents support different polyester and epoxy formulation systems.

Step 4: Select Pigments for the Real Cure and Exposure

Pigments must survive extrusion and oven curing without unacceptable color change. Exterior pigments also require suitable light and weather stability.

Consider:

• Color strength

• Hiding power

• Heat stability

• Weather resistance

• Chemical resistance

• Dispersion

• Regulatory status

• Interaction with other ingredients

Dark, bright, metallic, and low-opacity colors may require different formulation strategies. Color matching should be performed after the formula and cure schedule are reasonably stable.

Step 5: Use Fillers Deliberately

Fillers can adjust cost, hardness, density, flow, sanding behavior, and mechanical properties. They should not be treated as inactive volume.

Particle size, shape, purity, oil absorption, moisture, and surface chemistry influence dispersion and film quality.

Excess or unsuitable filler can cause:

• Reduced flow

• Poor impact resistance

• Lower coverage

• Rough surfaces

• Extruder-load changes

• Higher density

• Difficult spraying

Step 6: Add Only the Functions the Formula Needs

Leveling agents, degassing agents, waxes, matting materials, texturing agents, and other additives should solve defined processing or performance needs.

Our functional additives can support leveling, surface smoothness, abrasion resistance, degassing, flow, and appearance control.

Additives used at low dosage require accurate weighing and good premixing. A small dosing error may change surface tension, gloss, texture, or film appearance.

Step 7: Design Around the Production Line

The formula must be compatible with actual manufacturing and customer application equipment.

Record:

• Premixer type

• Extruder configuration

• Extrusion-temperature range

• Cooling method

• Grinding system

• Target particle size

• Spray equipment

• Substrate thickness

• Oven type

• Required metal temperature

• Production-line speed

A formula that performs well in a small laboratory extruder may need adjustment before full-scale production.

Step 8: Test in Stages

Use a controlled development sequence:

1. Verify incoming raw materials

2. Prepare a laboratory formula

3. Extrude under recorded conditions

4. Grind and classify the powder

5. Check storage and powder flow

6. Spray standardized panels

7. Cure at defined metal temperatures

8. Inspect appearance

9. Test mechanical and chemical properties

10. Complete weathering or corrosion tests where required

Change one major variable at a time. Altering the resin, curing-agent ratio, pigment, filler, and additive package simultaneously makes troubleshooting difficult.

Our Formulation and Manufacturing Support

As a powder coating raw materials OEM/ODM manufacturer, we provide resin, Curing Agents, additives, fillers, technical consultation, formulation evaluation, and production-optimization support.

Our 28 years of industry experience and five production bases allow us to combine material supply with technical and supply-chain coordination. Raw-material inspection, traceable production, batch testing, and digitalized management help customers maintain consistency when formulas move from laboratory trials to repeated manufacturing.

Release the Formula Carefully

An approved formula should record the exact raw-material grades, acceptable tolerances, processing conditions, cure schedule, film thickness, and test methods.

Substituting a resin, pigment, filler, or additive solely because it has a similar description can change the complete coating system. Evaluate every material change through controlled production and performance tests before approving it for commercial use.