BIS Certification for Wrought Aluminium and Aluminium Alloy Bars, Rods and Sections IS 733: 2025

This is the Indian Standard for wrought aluminum and aluminum alloy articles like bars, rods, sections, extruded tubes, hollow sections, and profiles, used for general engineering applications, as per IS 733:2025. This Indian Standard specifies the necessary specifications which need to be followed to make sure that aluminum products are fit for engineering uses. According to BIS (Bureau of Indian Standards), these include:

• Tested for chemical composition to verify alloy grade and purity levels
• Checked for mechanical properties such as tensile strength
• Verified for dimensional accuracy
• Examined for surface quality

• Construction and Infrastructure Applications: Used in construction and structure frames
• Automobile Industry: Used in automobiles in order to save weight
• Electrical Systems: Used in structures and assembly supports for transmissions
• Aerospace and Transport: Used in aerospace and railways for high strength applications
• Industrial Machinery: Used in machines and structures

• Manufacturers (India): Must get BIS authorisation if the Aluminium Bars are covered under QCO.
• Foreign Manufacturers - Need certification to export the product to India.
• Importers/Brand Owners - Must ensure that the products are BIS certified before selling.
• Sellers/Distributors - Should only sell certified alloy aluminium bars.

• Certification of adherence to the requirements of BIS as per IS 733:2025 for aluminium products for general engineering applications
• Improvement in the mechanical strength, load-bearing capacity, and performance of aluminium sections
• Improvement in dimensional accuracy and uniformity in bars, rods, tubes, and profiles
• Improvement in resistance to wear, corrosion, and environmental factors in industrial application
• More acceptance in infrastructure, manufacturing, and engineering works
• Credibility improvement through ISI Mark Certification and standardization
• Risk reduction of structural failure, material defect, and performance inconsistency
• Adherence to QCO requirements for regulated market access

• R (Required): Test must be conducted in the manufacturer’s in-house laboratory
• S (Subcontracting Allowed): Test can be conducted in a BIS-recognized or NABL-accredited external laboratory

• Manufacturing Process Verification (R) - Ensures aluminium products are manufactured using approved processes such as rolling, extrusion, or drawing.
• Raw Material Composition Verification (R) - Confirms the use of specified aluminium and alloy grades as per IS 733.
• Heat Treatment Process Control (R) - Ensures proper solution treatment, ageing, or tempering processes as per required temper conditions.
• Condition of Supply Verification (R) - Confirms materials are supplied in the specified temper condition (O, W, WP, etc.).

• Ladle Chemical Composition Analysis (R) - Determines alloying elements such as copper, magnesium, silicon, iron, and zinc.
• Product Chemical Analysis (R) - Verifies finished product composition within limits specified in IS 733.
• Alloy Element Verification (R) - Confirms major alloying elements are within prescribed ranges.
• Impurity Content Test (R) - Ensures impurities remain within permissible limits.
• Instrumental Spectro Analysis (S) - Advanced spectrometer-based testing for accurate elemental analysis.

• Dimension Measurement Test (R) - Verifies diameter, thickness, and sectional dimensions as per standard requirements.
• Dimensional Tolerance Verification (R) - Ensures compliance with tolerances specified in relevant standards (IS 3965).
• Cross-Section Verification Test (R) - Confirms proper geometry of bars, rods, and sections.

• Tensile Strength Test (R) - Determines tensile strength and proof stress as per IS 1816.
• Elongation Test (R) - Measures ductility and elongation properties of the material.
• Proof Stress Test (R) - Ensures yield strength meets specified requirements.
• Heat Treatment Performance Test (R) - Validates material performance after heat treatment.

• Freedom from Defects Test (R) - Ensures products are free from cracks, laps, seams, and inclusions.
• Surface Finish Evaluation (R) - Confirms smooth and uniform surface suitable for application use.
• Visual Inspection (R) - Detects surface irregularities and visible defects.
• Grain Structure Examination (S) - Checks for coarse grain formation in susceptible alloys.

• Alloy Grade Identification Test (R) - Confirms correct alloy designation as per IS 733.
• Size Verification Test (R) - Ensures products meet specified dimensional classifications.

• Lot Formation Verification (R) - Ensures grouping based on size, composition, and production method.
• Random Sampling (R) - Conducted as per IS 4905 statistical sampling methods.
• Heat Treatment Batch Identification (R) - Ensures traceability to production batch.
• Sample Marking Verification (R)- Confirms proper identification before testing.

• In-House Laboratory Requirement (R) - Ensures availability of testing facilities at manufacturing premises.
• External Laboratory Testing (S) - Allowed for chemical or specialized testing in BIS/NABL approved labs.
• Equipment Calibration Verification (R) - Ensures accuracy of testing instruments.

• Test Record Maintenance (R) - Maintains records of chemical and mechanical test results.
• Batch Certification Record (R) - Ensures traceability and compliance documentation.
• Compliance Documentation Review (R) - Verifies adherence to IS 1387 general supply requirements.
• Test Certificate Issuance (R) - Confirms compliance of supplied material with IS 733.

• Scheme of Inspection & Testing Compliance (R) - Ensures adherence to BIS inspection scheme.
• Lot Conformity Verification (R) - Confirms all test requirements are met before approval.
• Surveillance Inspection Testing (S) - Conducted during BIS factory audits.
• Periodic Reverification Testing (S) - Ensures ongoing compliance across production cycles.

• Marking Verification (R) - Ensures proper marking with manufacturer name, alloy designation, and condition.
• BIS Standard Mark Verification (R) - Confirms correct usage of ISI mark where applicable.
• Labelling Compliance Check (R) - Verifies product details like size, batch, and specifications.
• Packaging Integrity Check (R) - Ensures safe packing to prevent damage during transport.

• Defective Material Identification (R) - Detects non-compliant products during inspection.
• Rejected Material Disposal Control (R) - Ensures proper handling or reprocessing of rejected materials.
• Mark Removal for Rejected Lots (R) - Prevents misuse of certification marks.

• Initial Type Testing (S) - Conducted before BIS certification approval.
• Surveillance Testing (S) - Ensures continued compliance during license validity.
• Grade & Size Rotation Testing (S) - Ensures all variants are periodically tested.

• Mechanical Test Sampling (R) - Conducted based on lot size and classification.
• Chemical Test Sampling (R) - Performed on representative samples.
• Lot Acceptance Criteria (R) - Lot is accepted only if all chemical and mechanical requirements are satisfied.

The BIS Authorisation process ensures that the Aluminium Alloy products meet the required standards for proper and efficient operation. This process is set by the Bureau of Indian Standards (BIS) and includes the following steps:

1. Online Registration: Manufacturers register on the BIS Manak portal by submitting company, factory, and product details. Foreign manufacturers must appoint an Authorized Indian Representative (AIR).
2. Testing at BIS-Approved Laboratory: Product samples are tested in BIS-approved laboratories for material safety and structural durability.
3. Application Submission: The application is submitted along with test reports, technical documents, and factory details. Foreign manufacturers must also submit AIR-related documents.
4. Factory Inspection: BIS officials inspect the manufacturing unit to verify the production process, safety measures, and quality control system.
5. Grant of BIS License: If all requirements are met, BIS grants the certification license under Scheme-I.
6. Use of ISI Mark: After approval, the manufacturer can use the ISI mark on the product with a CM/L number, confirming that the product meets BIS standards.