General industrial powder coating is an environmentally friendly solid powder with near-zero VOC emissions and a high coating utilization rate, with an extremely wide range of applications.
This article systematically introduces the concept, characteristics, functions, applications, selection considerations, and solutions to common problems of general industrial powder coatings, with a focus on the wide range of applications of general industrial powder coatings, to help everyone better understand what general industrial powder coatings are and their characteristics and functions.

What Is General Industrial Powder Coating

General industrial powder coating is an environmentally friendly powder coating that is 100% solid and solvent-free. It is mainly applied to the surface of metal substrates through electrostatic spraying and forms a dense protective coating after heating, melting, and curing.
It has near-zero VOC (volatile organic compound) emissions, with a coating utilization rate of up to more than 90%. Oversprayed powder can be recovered and reused.

Characteristics of General Industrial Powder Coating

The main characteristics of general industrial powder coating are as follows.
1. Highly Environmentally Friendly
It contains no organic solvents, and VOC (volatile organic compound) emissions are close to zero. No wastewater or solid waste is generated, complying with strict environmental regulations.
2. Economical and Efficient
It has a high coating utilization rate, and oversprayed powder can be recovered and reused, with an overall utilization rate of more than 90%. A single spraying application can achieve a relatively high film thickness (typically 50-200μm), reducing the number of coating applications.
3. Excellent Mechanical and Physical Properties
The coating has high hardness, good scratch resistance and impact resistance. It has strong adhesion and good flexibility, making it less likely to crack during bending.
4. Excellent Corrosion and Weather Resistance
It is resistant to salt spray, acids and alkalis, and water stains, providing long-term protection for metal substrates. Some formulations have good resistance to ultraviolet aging and are suitable for outdoor use.
5. Rich Decorative Effects
It can be formulated to achieve various appearances, such as high gloss, matte, flat, sand texture, wrinkle, and metallic sparkle. It has good color stability and is less likely to fade during long-term use.

Functions of General Industrial Powder Coating

The main functions of general industrial powder coating are reflected in the following aspects:
1. Core Protective Functions
(1) Corrosion and Rust Prevention: Forms a dense coating on the metal surface to isolate air, moisture, and corrosive media, effectively preventing substrate rust and chemical corrosion.
(2) Resistance to Mechanical Damage: The coating has high hardness, impact resistance, and scratch resistance, protecting workpieces from physical impacts during transportation, installation, and use.
(3) Weather and Aging Resistance: Specific formulations can withstand ultraviolet radiation, wind and rain, and temperature changes, making them suitable for long-term outdoor use.
2. Decorative and Beautifying Functions
(1) Providing Color: Various colors can be formulated to meet the personalized appearance requirements of industrial products.
(2) Creating Texture: Rich surface effects such as high gloss, matte, sand texture, wrinkle, and metallic sparkle can be achieved to enhance the appearance and grade of products.
3. Other Extended Functional Applications
(1) Insulation or Conductivity: Special formulations can provide electrical insulation or conductivity to the coating for use in the electronics and electrical fields.
(2) High-Temperature Resistance / Flame Retardancy: Some specialized powders can withstand high-temperature environments or provide flame-retardant properties.

Applications of General Industrial Powder Coating

General industrial powder coating has a wide range of applications, mainly in the following fields.
1. Traditional Core Industrial Fields
(1) Machinery and Manufacturing: Widely used for coating various industrial machinery, agricultural equipment, construction machinery, and motors to protect equipment from wear and corrosion.
(2) Warehousing and Logistics: Used for warehouse racks, shelving systems, shopping carts, and other products to improve their durability.
(3) Home Appliances: Commonly used for air conditioner outdoor units, refrigerators, fire extinguisher cylinders, motor housings, and other home appliances and metal product housings.
(4) Construction and Municipal Applications: Used for building profiles, building components, fences, railings, and other products, providing both protection and decoration.
2. Emerging High-Growth Fields
With the advancement of the “paint-to-powder” trend, powder coatings are rapidly expanding into higher-value-added fields:
(1) New Energy and Automotive: Used for new energy vehicles, such as battery trays and liquid cooling plates, as well as charging piles, energy storage equipment, photovoltaic components, and traditional automotive components, meeting strict insulation, weather resistance, and corrosion resistance requirements.
(2) Energy and Electrical Applications: Used for transformers, generators, switchgear, and other power equipment to provide insulation and protection.

How to Choose General Industrial Powder Coating

When selecting general industrial powder coating, we may face the problem of not knowing how to choose. Based on our industry experience, we recommend focusing on the following aspects when selecting general industrial powder coating.
1. Consider Whether the Application Environment Is Indoor or Outdoor
This is the first principle for determining the resin type.
(1) Indoor Use (No UV Exposure): Choose epoxy or epoxy/polyester hybrid powder coatings, which offer good corrosion resistance, strong adhesion, and high cost-effectiveness.
(2) Outdoor Use (Long-Term Exposure to Sunlight and Rain): Pure polyester powder coating must be selected for UV resistance and gloss and color retention; otherwise, the coating will quickly chalk and fade.
2. Consider the Performance Requirements
Based on the actual operating conditions of the workpiece, focus on two key indicators:
(1) Corrosion Protection Requirements: Is ordinary protection required, or will the product be exposed to high salt spray or highly corrosive chemical environments? The latter requires a highly corrosion-resistant formulation or thick-film type.
(2) Mechanical Strength: Is the workpiece frequently subjected to impact, bending, or shock? It is necessary to confirm that the coating's impact resistance and flexibility meet the requirements.
3. Check Whether the Production Line Curing Conditions Match
Powder coating requires heating to cure and must be compatible with your existing equipment:
Confirm whether the oven temperature reaches 180°C-200°C and whether the time meets the requirement of 10-20 minutes.
If the oven temperature is insufficient, or the workpiece is thick or has poor heat resistance, a low-temperature-curing powder coating should be selected; otherwise, incomplete curing may occur, resulting in a soft coating and poor adhesion.

Common Problems and Solutions for General Industrial Powder Coating

The most common problems encountered during the use of general industrial powder coating are mainly reflected in the following aspects. Based on our industry experience, we propose corresponding solutions to help effectively solve the powder coating problems you encounter.
1. Cratering Problem
Phenomenon: Circular, sunken pits appear on the coating surface.
Main Causes:
(1) Oil, sweat, or insufficient degreasing remains on the workpiece surface.
(2) The compressed air contains oil or moisture.
(3) The powder has absorbed moisture or contains incompatible impurities, such as silicone.
Solutions:
(1) Strengthen the degreasing process during pretreatment, and operators should wear clean gloves.
(2) Install an oil-water separator in the compressed air line and regularly drain water and contaminants.
(3) Store the powder in a cool and dry environment (temperature <27°C, humidity <60%), and replace powder that has absorbed moisture or been contaminated.
2. Orange Peel Problem
Phenomenon: The coating surface presents fine uneven textures similar to the surface of an orange peel.
Main Causes:
(1) The curing temperature is too low or the curing time is insufficient, resulting in inadequate melting and leveling.
(2) The powder particle size is too coarse, resulting in poor leveling.
(3) The coating thickness is too thick or too thin.
Solutions:
(1) Check the baking oven temperature curve to ensure that the recommended curing conditions are achieved (typically 180-200°C/10-20 min), and ensure sufficient melting and leveling time.
(2) Contact the powder coating supplier to adjust the powder particle size distribution.
(3) Control the coating thickness within the recommended range (typically 60-80μm).
3. Poor Adhesion Problem
Phenomenon: The coating peels off in large areas during cross-cut or impact testing, or the coating lifts after external impact.
Main Causes:
(1) Incomplete pretreatment (oil, rust, or poor-quality phosphating/silane film).
(2) Insufficient curing (incomplete cross-linking reaction of the resin).
(3) The powder is incompatible with the substrate, such as using ordinary powder coating on galvanized sheets.
Solutions:
(1) Strictly follow the pretreatment process (degreasing → water washing → surface conditioning → phosphating/silane → drying) to ensure that the workpiece surface is clean.
(2) Use an oven temperature monitoring instrument to verify whether the actual heating temperature and time of the workpiece meet the requirements.
(3) For special substrates such as galvanized sheets and aluminum, select specially formulated matching powder coatings.
4. Particle Problem
Phenomenon: Small, visible particle-like protrusions appear on the coating surface.
Main Causes:
(1) The spray booth or curing oven environment is not clean, allowing dust, fibers, and other airborne particles to fall onto the coating.
(2) The powder itself contains gel particles or has absorbed moisture and formed lumps.
(3) Recovered powder is reused directly without screening, introducing impurities.
Solutions:
(1) Keep the spray booth and curing oven clean, and regularly remove accumulated powder and dust.
(2) Pass the powder through an 80-120 mesh vibrating sieve before use, and replace batches containing impurities.
(3) Recovered powder must be screened before use and mixed with new powder at a ratio of ≤30%.
5. Color/Gloss Deviation Problem
Phenomenon: The actual sprayed product has an obvious color difference from the standard color panel, or the gloss does not meet the requirements.
Main Causes:
(1) Excessive fluctuations in curing temperature affect pigment development and gloss.
(2) Uneven coating thickness results in differences in hiding power and appearance.
(3) There are color differences between different batches of powder, or the proportion of recovered powder is not properly controlled.
Solutions:
(1) Strictly control oven temperature stability, regularly calibrate the oven temperature testing instrument, and avoid significant temperature fluctuations.
(2) Optimize spraying parameters to ensure uniform and consistent film thickness across all parts of the workpiece.
(3) Purchase powder from the same batch for large-volume production and strictly control the proportion of recovered powder; perform a sample panel color comparison and confirmation before formal production.

If you encounter difficult-to-solve problems during the use of general industrial powder coating, please feel free to contact us at any time for professional technical support. We can discuss solutions together and promote the development of the powder coating industry.

We hope this article can provide you with a professional and reliable reference regarding the powder coating industry. We sincerely welcome you to consult us regarding powder coating product performance, industry standards, application methods, precautions, or any other related questions. We look forward to receiving your message or direct contact at any time so that we can provide you with more detailed product information, demonstration videos, or customized solutions to help you fully understand the various functions and advantages of the products.