Chair

:For other uses of the term chair, please see chair (disambiguation).

Standards and specifications

Design considerations for chairs have been codified into standards. ISO 9241-5:1988http://www.iso.ch/iso/en/CatalogueDetailPage.CatalogueDetail?CSNUMBER=16877&ICS1=13&ICS2=180&ICS3=, "Ergonomic requirements for office work with visual display terminals (VDTs) -- Part 5: Workstation layout and postural requirements

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" is the most common one for modern chair design.

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There are multiple specific standards for different types of chairs. Dental chairs are specified by ISO 6875. Bean bag chairs are specified by ANSI standard ASTM F1912-98http://webstore.ansi.org/ansidocstore/product.asp?sku=ASTM+F1912%2D98. ISO 7174 specifies stability of rocking and tilting chairs. ASTM F1858-98 specifies lawn chairs. ASTM E1822-02b defines the combustibility of chairs when they are stacked.

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The Business and Institutional Furniture Manufacturer's Association (BIFMA) defines BIFMA X5.1 for testing of commercial-grade chairs. It specifies things likehttp://www.lifetime.com/TablesAndChairs/bifma.pdf:

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• chair backstrength of 150 pounds (68 kg)
• chair stability if weight is transferred completely to the front or back legs
• leg strength of 75 pounds (34 kg) applied one inch (25 mm) from the bottom of the leg
• seat strength of 225 pounds (102 kg) dropped from six inches (150 mm) above the seat
• seat cycle strength of 100,000 repetitions of 125 pounds (57 kg) dropped from 2 inches (50 mm) above the seat

The specification further defines heavier "proof" loads that chairs must withstand. Under these higher loads, the chair may be damaged, but it must not fail catastrophically.

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Large institutions that make bulk purchases will reference these standards within their own even more detailed criteria for purchase

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http://www.tbpc.state.tx.us/spec_lib/425/specs/06-12a.html. Governments will often issue standards for purchases by government agencies (e.g. Canada's Canadian General Standards Board CAN/CGSB 44.15M http://www.techstreet.com/cgi-bin/detail?product_id=23061 on "Straight Stacking Chair, Steel").

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