Standard No.:	QB/T 2712-2005
Chinese Name:	皮革 物理和机械试验 粒面强度和伸展高度的测定：球形崩裂试验
English Name:	Leather -- Physical and mechanical tests -- Determination of distension and strength of grain -- Ball burst test
Professional Classification:	Y45 Leather processing and products in general
Professional Classification:	QB Professional Standard - Light Industry
ICS Classification:	59.140
Issued by:
Issued on:	2005-03-19
Implemented on:	2005-09-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:	3000 words
Price(USD):	90 (USD)
Delivery:	via email in 1-3 business day

1 Scope

This standard specifies a method for the determination of distension and strength of leather grain.
This standard is applicable to all types of leathers (light leather).

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
QB/T 2706-2005 Leather — Chemical physical and mechanical and fastness tests — Sampling location (ISO 2418:2002, MOD)
QB/T 2707-2005 Leather — Physical and mechanical tests — Sample preparation and conditioning (ISO 2419:2002, MOD)

3 Principle

A steel ball is pressed against the centre of the flesh side of a circular disk of leather securely clamped round its periphery. The pressure and the distension produced are recorded at grain crack and at burst.