ISO 7173:1989 pdf download.Furniture — Chairs and stools — Determination of strength and durability.
This International Standard describes test methods for deter mining the strength and durability of all types of chairs, easy chairs and stools. Additional tests may be required for certain types of chairs and for chairs for specific fields of use. Such test methods will be described in future International Standards.
NOTE – For the purposes of this International Standard, pouffes are onsidered as stools.
Assessment of ageing and degradation is not included. The tests are not intended to assess the durability of stuffing materials, upholstery fabrics or foam cushions.
This International Standard does not include tests for reclining or tilted chairs in the reclined or tilted position.
The tests are designed to be applied to an article of furniture that is fully assembled and ready for use.
Forces and dimensions in the tests are applicable to chairs and stools intended for adult persons.
4 Test method
There are two methods for carrying out the tests.
4.1 For determining the values of strength and durability,testing may be carried out in sequence through the test levels until failure occurs.
4.2 For checking compliance with stated requirements, testing may be carried out by applying directly the appropriate test to the stated requirement.
NOTE – A summary of the tests is given in the table.
5 General test requirements
5.1 Preliminary preparation
Before any of the tests are commenced, the item shall be old enough to ensure that it has developed its full strength. At least four weeks in normal indoor conditions shall have elapsed between manufacture and testing in the case of glued joints in tImber and the like. See also clause 8 for prellminary noting of existing defects.