wooden chairs for office purposes
1986 Edition

This section outlines the scope of requirements related to wooden office furniture, covering workmanship, dimensional accuracy, physical and mechanical properties, and finishing standards.

Highlights include:

• Definition of required materials, construction quality, sizes, and finishing.
• Finishing processes must adhere to lacquering, polishing, varnishing, or painting standards as per IS 2338 (Part 1)-1967.
• Recommended finishes include clear lacquer, melamine resin paint, or polyurethane paint.
• Type testing covers workmanship quality, dimensional tolerances, physical and mechanical properties, and surface finish quality.
• All numerical values are to be rounded following IS 2-1960 to maintain prescribed significant digits.

A summary table of type tests ensures compliance with quality, durability, and aesthetic benchmarks.

Key material criteria specified include:

Timber:

• Selection of timber species should comply with IS 399-1963 suitable for furniture use.
• Timber must be defect-free, straight-grained, and well-seasoned.
• Moisture content should conform to IS 287-1973.
• Sapwood from durable species and timber from non-durable species require preservative treatment as per IS 401-1982.

Finishing Materials:

• Surfaces are to be finished by lacquering, polishing, varnishing, or painting.
• Paints and varnishes must meet IS 2338 (Part 2)-1967 requirements.
• Approved finishes include clear lacquer, melamine resin paint, and polyurethane paint applied per manufacturer guidelines.
• Adhesives must be polyvinyl acetate dispersion-based or cold-setting casein glue for wood sizing.

Fasteners:

• Use slotted countersunk and round-head wood screws conforming to applicable IS standards.

The section also includes a summary table listing relevant IS codes for different material aspects and a flowchart depicting timber selection and treatment process.

This part emphasizes strict adherence to dimensional specifications to ensure quality and interchangeability in industrially produced wooden office chairs.

Key elements include:

• Dimensions and tolerances are verified through type and routine testing.
• Each chair must be inspected for conformity regarding size and tolerance.
• Measurement results are rounded according to IS 2-1960.

Typical dimensions with tolerances include:

• Seat height: 430–480 mm with ±5 mm tolerance
• Seat width: 400–500 mm with ±5 mm tolerance
• Backrest height: 300–400 mm with ±5 mm tolerance
• Overall chair height: 800–1000 mm with ±10 mm tolerance

A process flowchart illustrates dimension checking and subsequent steps during production.

This section details construction and workmanship criteria:

• Wooden frames must use timber as per specified clauses.
• Joinery should comply with IS 3845-1966 standards for wooden furniture joints.
• Finishing methods include lacquering, polishing, varnishing, or painting following IS 2338 (Part 1)-1967.
• Adhesives include polyvinyl acetate dispersion and cold-setting casein glue.
• Plywood used must conform to IS 303:1989 for general-purpose plywood.
• Type tests cover workmanship, dimensional accuracy, physical and mechanical properties, and finished surface quality.

A table summarizes key IS codes related to construction and a flowchart maps the construction and testing workflow.

Guidelines for finishing wooden furniture include:

• Surfaces must be lacquered, polished, varnished, or painted adhering to IS 2338 (Part 1) - 1967.
• Permissible paints are clear lacquer, melamine resin-based paints, and polyurethane paints applied per manufacturer instructions.
• Paints, enamels, and varnishes should comply with IS 2338 (Part 2) - 1967.
• Surface finishes undergo tests for impact resistance, adhesion, and scrape resistance as per IS 5807 (Part 6) - 1978.
• Additional tests cover resistance to dry and wet heat, marking by liquids, and mechanical damage.
• Test results must be rounded following IS 2-1960.

A table summarizes finish types with their corresponding test requirements, supported by a flowchart illustrating finishing and testing steps.

Essential requirements include:

• Test and analysis results must be rounded as per IS 2:1960, maintaining specified significant figures.
• Dimensions must align with Clause 3.4 of IS 3663:1981 covering seat depth, seat slope, armrest dimensions, backrest slope and height, and seat height.
• Physical tests ensure no distortion, loosening, oxidation, or defects after humidity variation tests.
• Design must be symmetrical along the central axis with no sharp edges.
• Mechanical tests include dropping, tipping backward, diagonal loading, twisting, seat impact, rolling, and rocking tests with no visible damage post-testing.
• Chairs must comply with ECO Mark criteria, with manufacturers providing certification.

A summary table lists test types, requirements, and reference standards.

Sampling and testing protocols include:

• Random sampling of lots per IS 5416:1969 to ensure representativeness.
• Testing categorized into three types (details not specified).
• Test results rounded as per IS 2:1960, retaining significant digits.
• Mechanical damage tests conducted according to IS 5807 (Part 6):1978.
• Additional tests for heat resistance and resistance to marking by liquids as per other parts of IS 5807.

A summary table outlines test types along with corresponding IS standards, and a flowchart depicts the sampling and testing process.

Packaging requirements specify:

• Chairs shall be packed following standard trade practices; no fixed packaging dimensions are prescribed.
• Protective packaging materials, such as bubble wrap or cardboard, should be used to prevent transit damage.
• Packaging must ensure stability and stacking strength to avoid deformation.
• Packages should be labeled with handling instructions.

Related IS codes cover finishing materials, adhesives, plywood quality, medium density fibreboard, and wood screws to ensure assembly integrity before packaging.

Best practices include secure packing of assembled or disassembled chairs, use of moisture-resistant materials if necessary, adherence to manufacturer finishing instructions, and ECO Mark compliance when applicable.

Purchasers are required to provide:

• The type and model or shape of the wooden chair.
• Desired color and finish specifications.

Additional considerations:

• Packaging should comply with usual trade practices.
• Test results must be rounded following IS 2-1960 standards.
• General product requirements must be adhered to as applicable.

A summary table lists purchaser-supplied information to ensure correct order fulfillment and regulatory compliance.

For ECO Mark certification, the following apply:

• Products must comply fully with ECO Mark provisions within IS 11525 and related standards.
• Plywood used must meet IS 303:1989 ECO Mark specifications.
• Medium density fibreboard must conform to IS 12406:1988 ECO Mark criteria.
• Manufacturers must obtain environmental clearance from the State Pollution Control Board under the Water (Prevention and Control of Pollution) Act, 1974, Air (Prevention and Control of Pollution) Act, 1981, and, if required, authorization under the Environment (Protection) Act, 1986.
• Submission of certificates or declarations of conformity to BIS is mandatory when applying for the ECO Mark.

A summary table highlights the relevant environmental and material compliance standards, supported by a flowchart illustrating the ECO Mark application process.