ISO 3303-1:2020 pdf download

ISO 3303-1:2020 pdf download.Rubber- or plastics-coated fabrics — Determination of bursting strength — Part 1: Steel-ball method
1 Scope
This document specifies a method for the determination of the bursting strength of rubber or plastics coated fabrics, using a mechanically operated steel ball.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
ISO 2231:1989, Rubber- or plastics-coated fabrics — Standard atmospheres for conditioning and testing
ISO 7500-1:2018, Metallic materials — Calibration and verification of static uniaxial testing machines —
Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
A test piece is securely clamped between rigid coaxial apertures. A polished steel ball traversing at a fixed speed is pressed against the test piece until failure occurs. The force required to cause failure and the displacement of the polished steel ball at failure are recorded.
5 Apparatus and reagents
5.1 Testing machine, power driven, equipped with an electronic force measurement system and an electronic crosshead displacement monitor. The drive system shall be capable of maintaining constant the speed of the moving head to ±10 % of the set value. The force measurement system shall be capable of measuring the relevant forces occurring during the test within class 2 of ISO 7500-1:2018. The crosshead displacement monitor shall be capable of measuring the relevant displacements under load to within ±1,0 mm.
5.2 Bursting attachment (see Figure 1), such that the test piece is held securely by a ring mechanism of internal diameter 45,0 mm ± 0,5 mm, with the centre of the test piece pressed against a polished steel ball of diameter 25,20 mm ± 0,02 mm until the test piece ruptures. The direction of motion of the ring- clamp or steel ball shall be at right angles to the plane of the fabric. The clamping surfaces of the upper and lower clamps shall be grooved concentrically such that the crowns of the grooves of one plate fit the grooves of the other. The grooves shall be not less than 0,8 mm apart and not less than 0,15 mm deep. The grooves shall start no further than 3 mm from the edge of the aperture and shall be rounded to a radius of not greater than 0,4 mm. The lower inner edge of the upper clamp and the upper inner edge of the lower clamp shall be rounded off to a radius of 0,5 mm.