中文简体
EnglishAnti-Gassing Powder Coating
Industrial-grade protective coating solutions: environmentally friendly, durable, and cost-effective.
Intro to Anti-Gassing Powder Coating
Anti-Gassing Powder Coatings are specialized formulations designed to prevent or mitigate surface defects (pinholes and craters) caused by the outgassing of substrates during the cure cycle. These defects commonly arise when coating porous metals (e.g., castings, galvanized steel) or parts with contaminants that release gasses when heated. Anti-Gassing powders use specific outgassing release additives that create a controlled micro-porous structure in the film or modify the surface tension, allowing trapped gasses to escape without forming visible defects in the final finish.
Controlling Porosity and Film Release
Standard powder coatings form a continuous, impermeable film that traps gasses released by the metal substrate (such as zinc from galvanization, moisture, or residues from manufacturing processes) as the temperature rises. This trapped gas forces its way through the molten film, leaving visible craters, pinholes, or blistering. Anti-Gassing formulas combat this by two main mechanisms: 1) Micro-porous Structure: Certain additives create minute channels within the film, too small to be seen but large enough for gas to escape. 2) Surface Tension Control: The formulation maintains a low surface tension in the molten state, allowing bubbles to collapse quickly before the coating hardens. They are mandatory for coating sand castings, cast iron components, and hot-dip galvanized steel, where outgassing is inevitable and severe. Using an Anti-Gassing formulation minimizes scrap rates and costly re-work, ensuring a smooth, defect-free finish even on compromised substrates.
Specifications
| Property | Standard Anti-Gassing Value |
| Primary Function | Mitigation of Pinholes and Craters |
| Target Substrates | Castings (Iron/Aluminum), Galvanized Steel, Porous Metals |
| Mechanism | Controlled Surface Release/Micro-Porosity |
| Defect Reduction | High (Minimizes outgassing-related flaws) |
| Chemical Base Options | Epoxy, Hybrid, or Polyester (Additive-based) |
| Film Integrity | Maintained (Micro-porosity does not compromise protection) |
| Application Focus | Defect Control on Problematic Substrates |
| Cure Requirement | Must follow specified cure to activate additive |
Application Fields
- Automotive Castings: Engine blocks, pump housings, and manifolds made of cast iron or aluminum.
- Hot-Dip Galvanized Steel: Structural steelwork, railings, and poles used in outdoor environments.
- Agricultural Equipment: Cast parts and rough-fabricated assemblies.
- Industrial Valve Bodies: Cast components with inherent porosity issues.
- Fabricated Parts: Substrates where cleaning residues or trapped solvents are suspected.
Key Characteristicss
- Pinpoint Defect Elimination: Dramatically reduces pinholes and craters on porous substrates.
- Substrate Versatility: Enables coating of traditionally difficult, outgassing metals (castings, galvanized).
- Improved Aesthetics: Ensures a smooth, high-quality finish on otherwise rough surfaces.
- Cost Savings: Lowers scrap rates and the need for high-temperature pre-bake procedures.
- Functional Barrier: Maintains the corrosion and mechanical protection of the base polymer.
Comparison: Anti-Gassing vs. Standard Powder
| Feature | Anti-Gassing Powder | Standard Powder Coating |
| Porous Substrates | Excellent Performance | High Risk of Pinholes/Craters |
| Contains Additives | Yes (Specialized anti-gassing agents) | No |
| Film Surface Tension | Lower (Allows gas to escape) | Higher (Traps gas under film) |
| Required Pre-Bake | Reduced or Eliminated | Often Mandatory (Costly/Time-consuming) |
| Final Finish Quality | High (Smooth, Defect-free) | Compromised (Defects likely) |
Why choose us
Customization: We have a strong R&D team,and we can develop and produce products according to different requirement of customers.
Cost: We have our own raw material production center.So we can offer the most favourable price and good-quality products directly.
Quality: We have our own testing lab and the most advanced and complete inspection equipment, which can ensure the quality of our products.
Capacity: Our annual production capacity is over 30000 tons, we can meet the needs of different customers with diverse purchase quantity.
Service: We focus on developing high-quality products for top-end markets. Our products are in line with international standards, and are mainly exported to Europe, America, Southeast Asia, South America and other destinations around the world.
Shipment: We are only 200 kilometers away from the Shanghai Port and 230 kilometers to Ningbo port, it is very convenient and efficient to ship goods to any other countries.
Customization
Quality
Capacity
Service
Shipment
Frequently Asked Questions (FAQs)
- Q: Does using anti-gassing powder eliminate the need for pre-bake on galvanized steel?
- A: In many cases, yes. The powder is designed to manage the outgassing that pre-baking traditionally solves, often allowing manufacturers to eliminate the costly and time-consuming pre-bake step.
- Q: Does the micro-porous structure affect corrosion protection?
- A: No. The engineered micro-porosity is not large enough to allow moisture or corrosive agents to penetrate the film to the substrate, and the corrosion performance is maintained to the standard of the base chemistry (Epoxy or Polyester).
- Q: Can anti-gassing additives be put into any standard powder?
- A: While a coater can sometimes add leveling or flow additives, effective anti-gassing requires a pre-engineered formulation from the powder manufacturer to ensure compatibility and consistent release performance.
Selection Guide: Anti-Gassing Powder
Select Anti-Gassing Powder Coating when:
- The substrates are known to be porous, gassy, or difficult to coat (e.g., castings, galvanized steel).
- The current process experiences high defect rates (pinholes, craters) caused by substrate outgassing.
- The manufacturer wants to eliminate or significantly reduce the energy/time costs associated with a high-temperature substrate pre-bake.
- A high-quality, smooth aesthetic finish is mandatory on a challenging substrate.
- The coating system must provide reliable protection without sacrificing film integrity due to outgassing.
