Elastic recovery properties of building sealing materials

The elastic recovery performance test of building sealing materials can measure the elastic recovery rate of building sealing materials after maintaining a tensile state. 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 specimen is stretched to the specified width, maintained in the stretched state for the specified time, and then released.
The elastic recovery rate (expressed as a percentage of elongation) is calculated based on the change in width of the specimen before and after stretching.

GB/T 13477.17-2017 Test methods for building sealing materials Part 17: Determination of elastic recovery rate
ISO 7389: 2002 Building construction Welding products Determination of elastic recovery rate of sealants
EN ISO 7389: 2002 Building construction Welding products Determination of elastic recovery rate of sealants
DIN ISO 7389: 2002 Building construction Welding products Determination of elastic recovery rate of sealants