Steel structure coatings are usually purchased as a system, not as one isolated paint. A project may need an anti-corrosion primer, an epoxy intermediate coat, a durable topcoat, and sometimes thinner or curing agent. GB 30981.2-2025 helps buyers discuss harmful-substance limits for these products, but it does not replace corrosion design or project acceptance rules.
For overseas buyers, the useful question is not simply “Does this paint meet GB?” A better question is: “Which GB 30981.2 category applies to each layer, and what documents support the coating system for my project?”
What GB 30981.2 Helps You Check
GB 30981.2-2025 is China’s national standard for harmful-substance limits in industrial coatings. For steel structure coatings, it helps organize questions around product type and controlled substances.
A steel coating may be waterborne, solvent-borne, solvent-free, powder, or an accessory material under the standard’s type logic. This matters because an epoxy primer, zinc-rich primer, or polyurethane topcoat can have different VOC and harmful-substance profiles depending on formulation.
VOC is often the first topic, especially for large-area site coating. Buyers should also know that other indicators may matter, such as benzene, toluene and xylene including ethylbenzene, halogenated hydrocarbons, PAH, methanol, glycol ethers and ether esters, heavy metals, and curing-agent-related items in some systems.
The exact list depends on the product category and chemistry. A good supplier should be able to explain which indicators are relevant instead of giving one generic answer for every steel coating.
What GB 30981.2 Does Not Decide
GB 30981.2 is not a corrosion durability standard. Many steel projects use ISO 12944 or a local project specification to define corrosion environment, coating system thickness, surface preparation, and expected durability.
That means GB 30981.2 and ISO 12944 answer different questions:
- GB 30981.2 helps with harmful-substance and environmental screening.
- ISO 12944 or the project specification helps with corrosion protection design.
- The TDS and SDS explain the actual Qilu product, mixing ratio, application window, and safety information.
For example, an indoor factory beam, a coastal warehouse, and a bridge steel structure may all use protective coatings, but they do not need the same system.
What To Ask Before Ordering
Before placing a steel structure coating order, ask for:
- the recommended coating system by layer;
- the GB 30981.2 category and product type for each product;
- current TDS and SDS for primer, intermediate coat, topcoat, thinner, and curing agent;
- VOC or harmful-substance information available for the relevant category;
- surface preparation requirement;
- dry film thickness by layer;
- mixing ratio, pot life, and recoat interval for two-component products;
- the corrosion environment or project standard the system is designed for.
This keeps the discussion practical. The buyer can compare Chinese GB information with the destination project’s own environmental, technical, and procurement requirements.
For Qilu customers, the right approach is to connect three things: GB 30981.2 for harmful-substance screening, Qilu product or enterprise standard control for supply consistency, and the project specification for real corrosion performance.
That is also a sensible ESG procurement habit. GB 30981.2 is not a sustainability certificate, but it gives buyers a clearer environmental baseline before selecting, importing, and applying steel structure coatings.