GB/T 1634.2-2019 Active National standards

GB/T 1634.2-2019 Plastics—Determination of temperature of deflection under load—Part 2:Plastics and ebonite

Publish Date: 2019-05-10 Implement Date: 2020-04-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 1634.2-2019

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Basic standards and general methods for synthetic resins and plastics

ICS Name: Plastic Composite

Publish Date: 2019-05-10

Implement Date: 2020-04-01

Pages: 10 pages

Scope

This part of GB/T 1634 specifies three methods for determining the load deformation temperature of plastics (including filled plastics and plastics reinforced with fibers less than 7.5 mm in length) and hard rubber using different constant bending stress values. -- Method A using a bending stress of 1.80 MPa; -- Method B using a bending stress of 0.45 MPa; -- Method C using a bending stress of 8.00 MPa. The standard deflection Δs used to determine the load deformation temperature corresponds to the bending strain increment Δεf specified in this part. The initial bending strain of the specimen under load at room temperature is neither described nor measured in this part. The ratio of the bending strain difference to the initial bending strain depends on the room temperature elastic modulus of the tested material. Therefore, this method is only suitable for comparing the load deformation temperatures of materials with similar elastic properties at room temperature.