What are the three main tests for mechanical damage in this standard?

The standard covers the Scratch Test (Clause 2), Scrape Test (Clause 3), and Impact Test (Clause 4).

What is the standard mass of the ball for the impact test?

A 500 g steel ball is used for the impact test (Clause 4.1.2).

How is scratch resistance determined?

A needle with increasing load is drawn across the surface. The resistance is the maximum load that does not cause the needle to penetrate the finish down to the wood substrate (Clause 2).

Does this standard apply to paints on furniture?

No, its scope is limited to 'Clear Finishes for Wooden Furniture' as stated in the title.

IS 5807

: 2000

Methods of test for clear finishes for wooden furniture, Part 5: Test for low-angle glare

CurrentSpecializedTesting MethodMaterials Science · Building Construction Practices incl. Painting, Varnishing

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This standard specifies the test methods for assessing the resistance of clear finishes on wooden furniture to mechanical damage. It details procedures for conducting scratch tests, scrape tests, and impact tests to evaluate the durability and performance of coatings like varnishes and lacquers.

Methods of test for clear finishes for wooden furniture, Part 5: Test for low-angle glare

Quick Reference Values

Impact test steel ball mass500 ± 5 g

Impact test steel ball diameterapprox. 50 mm

Scrape test tool (loop) materialHardened steel wire

Scrape test load1.5 kg

Scratch test needle tip radius0.05 mm

Key Formulas

G = (Reading of Specimen / Reading of Standard) x Assigned value of Standard — Gloss Value Calculation

Practical Notes

The standard defines the test method, not the pass/fail criteria. Performance requirements must be specified separately by the purchaser or in a product standard.

Proper conditioning of test panels as per IS 101 is critical for obtaining consistent and comparable results.

Interpretation of damage, especially for the scratch test (penetration to the substrate), requires careful observation, often with magnification and controlled lighting.