In the "JG/T298-2010" standard for interior building materials, there are two types of putty products: water-resistant (N-type) and general-purpose (Y-type). The main difference between them lies in their durability and resistance to moisture. Water-resistant putty must have a bond strength of at least 0.50 MPa under normal conditions, while general-purpose putty only needs to achieve 0.30 MPa or more. Additionally, after being scraped, water-resistant putty must be submerged in water for 48 hours without peeling, cracking, or blistering, and still maintain a bond strength of 0.30 MPa or higher. On the other hand, general-purpose putty tends to fall off completely when exposed to water, with no remaining strength.
The water immersion test described in the standard is an extremely harsh and destructive evaluation method. Although it's unlikely that anyone would intentionally submerge wall putty in water, the issue this test highlights is crucial — the product’s long-term performance. Even though homes aren’t typically flooded, moisture in the air can constantly affect the walls. Over time, this exposure to humidity can weaken the material. Strong water resistance ensures a longer lifespan, while poor water resistance significantly reduces it. When properly applied, water-resistant putty can last over 15 years, whereas general-purpose putty usually lasts only about 5 years, especially if it's protected by latex paint on the surface.
Understanding these differences helps consumers make informed choices when selecting putty products for their homes. Investing in high-quality, water-resistant putty not only improves the durability of the wall surface but also saves money in the long run by reducing the need for frequent repairs and reapplication. Always check the specifications and standards of the products you choose to ensure they meet your needs and provide lasting value.
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