In the mid-1990s, China introduced the GB50207-94 national standard titled "Technical Specifications for Roofing Engineering." This document clearly outlined quality requirements, construction methods, and acceptance criteria for various types of waterproof coatings. The implementation of this standard significantly contributed to the development of the industry. However, despite these efforts, there is still no mandatory regulation specifically for waterproof coatings, leading to a chaotic market that requires stricter oversight.
When it comes to home renovation, particularly in kitchens and bathrooms, waterproofing is an essential step. Unfortunately, none of the ten mandatory national standards address the control of harmful substances in waterproof coatings. As a result, there's a growing need for more rigorous management during home improvement projects.
Some homeowners have reported strong odors in their bathrooms and kitchens. Upon investigation, testing centers found that the pollution was largely due to the use of certain waterproof coatings, which can be difficult to eliminate once applied.
Currently, two main categories of waterproof materials are available on the market. The first is polyurethane-based waterproof coatings. These were traditionally made using polyurethane and coal tar, but they were banned in 2000 due to their high toxicity. Today, some products on the market substitute asphalt for coal tar, yet they often require dilution with solvents like toluene or xylene, which still pose health risks.
The second type is polymer cement-based waterproof coatings. These consist of water-based polymer emulsions combined with high-quality cement and various additives. By blending the flexibility of polymers with the rigidity of cement, these coatings offer excellent water resistance and long-term stability.
They are easy to apply, cost-effective, and environmentally friendly, making them increasingly popular among consumers. As a result, polymer cement-based coatings have become the dominant choice in the waterproofing market.
Experts remind us that many people mistakenly believe that the area treated with waterproofing in indoor spaces is small and not likely to cause pollution, especially since there are ceramic tiles and cement on the surface. However, the waterproof layer must be applied thick enough to ensure proper protection, which means a larger amount of material is used. If toxic coatings are used, they can lead to long-term indoor air pollution.
To prevent such issues, it's crucial to focus on the materials used in waterproofing. Non-toxic and eco-friendly options should be prioritized. Acrylate-based coatings and tar-free polyurethane products are now widely recognized as safe and odorless solutions that meet indoor environmental standards.
Consumers are advised to purchase from reputable suppliers and hire certified renovation companies. In any area where moisture is common—such as kitchens and bathrooms—waterproofing should always be done. The choice of waterproofing materials isn't just about aesthetics; it directly impacts the health and safety of the household. Since waterproofing is a hidden project, its effects may only become evident after years of use.
If the materials contain harmful substances, they can turn into silent threats within the home. Therefore, selecting the right waterproofing solution is a decision that shouldn’t be taken lightly.
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Gate valve structure: gate valve is the use of the gate and seat to control the opening and closing of the valve. Gate valve mainly has a valve body, valve seat, gate, valve stem, valve cover, stuffing box, packing gland, stem nut, hand wheel and other components. Depending on the change of the relative position between the gate and the valve seat, the channel size can be changed and the channel can be cut off. In order to make the gate valve close tightly, the mating surface of the gate plate and the valve seat are ground.
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