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Home / News / Industry News / Powder Coating Sandtex Effect Not Good — How to Choose the Right Powder?
Industry News
Powder Coating · Surface Texture · Sandtex Powder · F25 / F Series
In powder coating production, surface texture is a consistently important consideration. Many coating operations want to achieve a fine, natural sandtex feel on the coating surface — improving the appearance quality and layering of the coated workpiece. In practice, however, many operations encounter material compatibility difficulties: the chosen powder cannot produce the sandtex texture that meets expectations, the available particle size range is too narrow to flexibly adapt to different workpiece requirements, and overseas-sourced materials have long procurement lead times and complex supply chains. Finding a suitable domestic sandtex powder with stable particle size, reliable supply, and consistent performance is therefore a practical production need for many coating operations.
Four Common Problems with Sandtex Powder Selection
Sandtex Texture Inconsistent — Batch Quality Fluctuates
The coarseness and fineness of the sandtex texture varies, and obvious differences in surface appearance exist between workpieces from the same batch — requiring additional manual inspection and sorting, increasing production process burden.
Narrow Particle Size Range — Cannot Adapt to Different Workpiece Requirements
Some commercially available powders have a limited particle size distribution range, making it difficult to match diverse processing needs. Producing different coarseness levels of sandtex requires procuring multiple materials, increasing inventory management complexity.
Overseas Sourcing — Long Lead Times and Supply Chain Risk
Some overseas-sourced powder materials have complex procurement procedures and long order-to-delivery cycles. During concentrated order periods, material replenishment cannot keep pace with the production schedule — affecting project delivery.
Poor Compatibility with Powder Coating Substrate
Some powder materials are not sufficiently compatible with the base resin system, causing abnormal surface appearance after spraying, increasing rework rate and material waste.
Limitations of Traditional Approaches
Many coating operations have traditionally selected imported equivalent powder to produce sandtex coatings. While these materials can achieve the required surface texture, procurement procedures are complex, turnover cycles are long, and supply continuity can be affected by external factors. At the same time, some domestically available alternative materials have inconsistent molecular weight control, unstable crystalline state, and limited particle size range — making it difficult to flexibly adjust coating sandtex appearance. Using these materials can result in uneven texture and inconsistent powder dispersion, restricting the range of workpieces that can be processed.
F25 / F Series Sandtex Powder
F25 series sandtex powder is a white powder made from crystalline high-molecular-weight polyethylene, with a particle size range covering 5μm to 140μm. The F series sandtex powder, also a crystalline high-molecular-weight polyethylene white powder, covers the same particle size range of 5μm–140μm. This series can benchmark against equivalent overseas products and can be used as a replacement material in production.
In actual processing, the sandtex powder is mixed into the powder coating system at the appropriate formulation ratio, and after thorough mixing follows the existing spray process. The powder's inherent material properties promote sandtex surface formation during the coating film formation stage. The wide particle size distribution gives production operations more selection flexibility — choosing the appropriate particle size grade for the specific workpiece processing requirement to achieve different sandtex surface appearances — adapting to different workpiece spray operations.
| Material Type | Crystalline high-molecular-weight polyethylene white powder |
| Particle Size Range | 5μm–140μm (F series and F25 series) |
| Benchmarking | Can benchmark against equivalent overseas products and be used as replacement material |
| Application Method | Mixed into the powder coating system at formulation ratio; follows existing spray process |
| Effect Flexibility | Wide particle size distribution enables different sandtex coarseness levels for different workpiece requirements |
For powder coating operations needing to produce sandtex surface texture, sandtex powder selection directly affects the surface appearance quality of the coated workpiece. A sandtex powder with a wide particle size distribution range, stable crystalline structure, and good compatibility with the powder coating system gives the production operation more adjustment flexibility — achieving different sandtex texture effects as required by the workpiece, improving surface appearance consistency across batches.
Frequently Asked Questions
What determines the coarseness of the sandtex texture — the sandtex powder particle size alone, or other factors as well?
The sandtex powder particle size is the primary determinant — larger particles produce coarser texture, smaller particles produce finer texture. However, the final visual texture is also influenced by the addition ratio in the formulation (higher addition typically produces more pronounced texture), the compatibility between the sandtex powder and the base resin, and the spray and cure conditions. For precise texture control, evaluating the combination of particle size, addition level, and process conditions together is more reliable than adjusting particle size alone.
Can sandtex powder be used across different powder coating resin types — for example, both epoxy-polyester hybrid and pure polyester systems?
Crystalline polyethylene sandtex powder is generally compatible with most thermoset powder coating base systems, including epoxy, epoxy-polyester hybrid, pure polyester, and polyurethane systems. Compatibility should be confirmed through a small-scale trial in the specific base system at the target addition level, as the interaction between the sandtex powder surface and the curing resin can affect both the texture formation and the film performance in some combinations.
