Compression resistance test of building sealing materials

The compression resistance test of building sealing materials can determine the compression resistance of sealing materials for joints in building structures. Zhongke Testing and Reliability Experiment Center has the capabilities of environmental testing and reliability performance testing of various building materials, products and components, and provides professional mechanical property testing services such as density, low temperature and temperature properties, compression properties, elastic recovery properties, mass and volume change properties, etc. for building sealing materials.

1. Sealing materials can be divided into two categories according to their strength: shaped sealing materials (sealing strips, pressure strips, etc.) and non-shaped sealing materials (sealing paste or caulking paste, etc.).
Amorphous sealing materials can be divided into plastic sealing paste, elastic-plastic sealing paste and elastic sealing paste according to their raw materials and their properties.
2. Sealing materials can be divided into polysulfide, polyurethane, silicone, chloroprene rubber, butyl rubber, acrylic glue, etc. according to their chemical composition.
At present, the three types that are used in large quantities on the market are silicone, polyurethane, and polysulfide.

The sealing material to be tested is bonded between two parallel surfaces to make a test piece. The test piece is compressed to a specified value under specified conditions, and the pressure and stress are recorded.
1. The test should be carried out at a temperature of (23±2)℃.
2. Remove the spacer and use a testing machine to compress the specimen to 75% or 80% of the initial width at a speed of (5~6) mm/min.
3. Record the pressure (N) when the specimen reaches the specified compression ratio.

GB/T 13477.16-2017 Test methods for building sealing materials Part 16: Determination of compression characteristics
ISO 11432:1993 Building structures - Sealants - Determination of pressure resistance