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1. Physical Appearance & Handling Identification

• Texture: High-quality powder should feel smooth, fluffy, and light like silk, flowing freely. Poor-quality powder feels rough, dense, and heavy. Good flow characteristics ensure easy application with less overspray and waste.
• Bulk Volume: Higher bulk volume indicates lower filler content and higher resin ratio, translating to better quality and higher cost. Lower volume suggests high filler content, resulting in inferior quality and lower cost. Comparing identical boxes, the one with larger volume contains superior powder. Low-volume powder is difficult to spray, leads to more waste, covers less area, and increases overall cost.
• Shelf Life: Good powder maintains its flow and performance over long storage periods (typically 12 months at room temperature). Inferior powder, often made with low-grade materials, degrades within 3 months, leading to poor leveling. Using such powder can cause premature chalking and aging of the coated surface within six months, damaging end-product reputation and creating waste.

2. Coverage Area Identification

The resin content in standard powder should be 55-65%. Some manufacturers reduce resin content (below 45%), increasing cheap fillers to cut costs. This significantly reuces coverage area. Comparison: spraying the same parts with different powders reveals which offers more coverage. Less coverage means higher effective cost. Assuming 6 m²/kg coverage, each m² less coverage equates to an additional cost of $0.40-$0.80 per kilogram. Using genuine powder is more cost-effective.

3. Application Efficiency Identification

Transfer Efficiency: Good powder has excellent first-pass transfer efficiency, covering the substrate in 1-3 sprays with minimal overspray, boosting productivity.

Work Efficiency: Poor powder requires 3-5 sprays for coverage, generating significant overspray and reclaim. Operators can identify this by high powder fall-off. This reduces output per shift, increases labor burden, and decreases overall efficiency.

4. Curing Process Identification: Smoke Emission

Good powder produces little to no visible smoke during curing. Significant smoke emission indicates the use of low-grade raw materials. This often correlates with poor coverage, increasing the amount of powder needed and raising the cost per unit area.

5. Finished Film Appearance & Gloss Identification

Appearance: A good powder film appears smooth, full, transparent (for clear coats), and has strong definition. A poor film looks dull, blurry, hazy, and flat.

Gloss Retention: High-quality powder maintains its gloss over time. Inferior powder may initially look good but begins to lose gloss within months, eventually leading to chalking and degradation. Poor materials cannot ensure long-term gloss stability and film integrity.

6. Adhesion & Aging Resistance Identification

Good powder exhibits strong adhesion and toughness, resisting chalking and aging for several years. Poor powder has weak adhesion and brittleness, often showing signs of aging, chalking, and corrosion within 3 to 6 months. Conduct adhesion, bend tests, and observe samples over time. Poor performance leads to premature product failure, reducing lifespan and damaging customer reputation.

7. High-Temperature Resistance Identification

• Method: Bake at 220-230°C for 10-15 minutes.
• Good Powder: Exhibits good heat and weather resistance. Color and gloss changes after baking are minimal.
• Poor Powder: Poor heat resistance leads to significant yellowing/darkening and gloss loss. This method is particularly effective for testing light-colored exterior grades. Inferior powders use low-grade resins, titanium dioxide, and pigments to cut costs.

8. Environmental Compliance (RoHS/REACH) Identification

• Good Powder: Uses raw materials from reputable suppliers, ensuring long-term compliance with environmental standards (e.g., RoHS, REACH).
• Poor Powder: The use of questionable materials or excessive recycled powder makes it impossible to guarantee consistent compliance. Failure to meet eco-friendly standards can cause significant financial losses for exporters.