BIS Product Certification for Steel Furniture: IS 4923 and Steel Tubes

Steel furniture and structural hollow sections (steel tubes used in furniture and construction) have BIS certification requirements under IS 4923 and related standards. This is an important compliance area for office furniture, shelving, and structural steel tube manufacturers.

Key BIS Standards

• IS 4923: Hollow steel sections for structural use — covers square, rectangular, and circular hollow sections (SHS, RHS, CHS) used in furniture and structural applications
• IS 1239 Part 1: Mild steel tubes, tubulars, and other wrought steel fittings — covers welded and seamless steel pipes
• IS 9891: Steel furniture — general requirements for chairs and tables
• IS 7761: Office furniture — general requirements

IS 4923: Structural Hollow Sections

IS 4923 covers the steel hollow sections (square tubes, rectangular tubes, circular tubes) that form the frame of most steel furniture and many structural applications. Requirements include:

• Chemical composition of steel
• Mechanical properties: yield strength, tensile strength, elongation
• Dimensional tolerances: wall thickness, outside dimensions, straightness
• Surface finish and protective coating requirements
• Weld quality for welded sections

BIS Mandatory Certification for Steel Tubes

Steel tubes under IS 1239 are subject to mandatory BIS ISI mark certification. This is one of the most extensively traded categories in Indian hardware markets. Substandard steel tubes — with thinner walls than specified — are a common market problem that compromises both furniture durability and structural integrity.

Steel Furniture Testing Under IS 9891

Steel furniture tested under IS 9891 evaluates:

• Load-bearing capacity of chairs (seat, back, and leg strength)
• Table surface deflection under specified loads
• Stability when subjected to side loads
• Fatigue durability — chairs must withstand thousands of load cycles
• Material quality of steel frames, fasteners, and surface finish

For Government Procurement

Government tenders for office furniture and furniture for educational institutions increasingly specify BIS certification to IS 9891 or IS 7761. Specifying BIS-certified furniture ensures consistent quality and provides legal protection if furniture fails to perform.