GB/T 20027.1-2025Rubber- or plastics-coated fabrics - Determination of bursting strength - Part 1:Steel-ball method (English PDF)

1 Scope

This document describes a method for the determination of bursting strength of rubber- or plastic-coated fabrics using a mechanically operated steel ball.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 24133-2009 Rubber- or plastics-coated fabrics - Standard atmospheres for conditioning and testing (ISO 2231.1989, IDT)

GB/T 16825.1-2022 Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1.Tension/compression testing machines -

Calibration and verification of the force-measuring system (ISO 7500-1.2018, IDT)

3 Terms and definitions

This document does not contain any terms or definitions that need to be defined.

4 Principle

A specimen is securely mounted between ring clamps with precise coaxiality. A polished steel ball is pressed against the specimen at a constant speed until the specimen ruptures. The force required to cause the specimen to rupture and the displacement of the polished steel ball at the time of rupture are recorded.

5 Instruments and reagents

6 Sampling

The sample taken shall be as representative as possible of the entire shipment.

7 Preparation of specimens

7.1 Cut five specimens within the effective width of the sample (see note) and at least

1 m from the end of the sample. Each specimen shall be of sufficient size to ensure secure clamping by the clamping device of the testing machine. The minor diameter of each specimen shall be at least 12 mm larger than the outer diameter of the clamping surface. Alternatively, the test can be carried out perpendicular to the width direction at the desired location, avoiding areas already tested by at least 20 mm.

NOTE. The definition of effective width is given in ISO 2286-1.It refers to the width excluding selvage, with consistent performance, uniform surface, and no unacceptable defects.

7.2 The relevant parties shall consult and determine the test side of the coated fabric.

Results may differ if the test is carried out on the opposite side.

7.3 When testing the properties of wet materials, the specimen shall be immersed in water (5.4) or water containing no more than 0.1 % wetting agent or surfactant (5.5) at room temperature for 24 h, with the volume of water being 20 times the volume of the specimen. After removing the specimen from the water, immediately rinse it thoroughly with water and carry out the test within 1 min.

8 Time interval between manufacture and testing

8.1 For all tests, the minimum time between manufacture and testing shall be 16 h.

9 Atmosphere for conditioning and testing