This standard outlines a precise testing methodology to determine the resistance of transparent wood finishes, applied on furniture, against marks caused by oils and fats. It involves applying oils or fats on coated wooden panels and evaluating any visible damage or discoloration after a specified exposure period. The code is vital for manufacturers, quality inspectors, and finish formulators to verify finish durability under typical oil and fat contact scenarios.
Overview
This standard outlines a precise testing methodology to determine the resistance of transparent wood finishes, applied on furniture, against marks caused by oils and fats. It involves applying oils or fats on coated wooden panels and evaluating any visible damage or discoloration after a specified exposure period. The code is vital for manufacturers, quality inspectors, and finish formulators to verify finish durability under typical oil and fat contact scenarios.
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Contents
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This section defines the purpose of the standard as establishing a uniform test for assessing the resistance of clear wood finishes to markings caused by oils and fats. It applies to comparing different finishes or verifying compliance with supply standards under simulated exposure to these substances. The substrate type and finishing system are not fixed but require mutual agreement between purchaser and supplier. If a test area fails, a retest is conducted on a separate panel, with two consecutive failures rendering the finish unacceptable.
Describes the fundamental requirements including the absence of a prescribed substrate or finish, emphasizing purchaser-vendor agreement. Visual inspection demands no visible markings for compliance. The retesting procedure mandates repeating tests upon any failure, with continued failure indicating rejection. The section references related parts of the IS 5807 series and outlines reporting protocols aligned with IS 2-1960.
Specifies panel dimensions (minimum 250 mm x 150 mm x 10 mm) and test spot size (25 mm diameter), including spacing and edge distance requirements. The finishing system should be applied according to IS 2338 (Part I) and aged at a minimum temperature of 15°C for at least 28 days before testing. Application of oil or fat spots is detailed, along with conditioning parameters at 27 ± 2°C for 24 hours prior to cleaning and inspection.
Outlines the steps for test panel preparation, aging, application of oil/fat pools, exposure conditions, cleaning with 0.5% acetic acid solution, and final polishing. Emphasizes random placement of test spots on different grain structures and the importance of maintaining test temperature and duration. The section also covers criteria for retesting and acceptance.
Explains visual assessment methods including inspection angles under natural daylight and the necessity for no visible finish damage. Describes actions based on pass/fail outcomes, with a retest requirement for initial failure and rejection upon repeated failure. The section also details reporting standards and rounding conventions.
Details the procedures to follow when a test area fails, including performing the test on a new panel under identical conditions. Reiteration of failure results in classification of the finish as unacceptable. The flowchart provided illustrates the decision-making process for acceptance or rejection based on test outcomes.
Lists relevant IS codes and painting/varnishing practices supporting this testing method. Emphasizes the necessity of purchaser and vendor consensus on test materials and substrates due to variability in wood types and finishing systems. Provides practical steps for implementing tests and references BIS contact details for further guidance.
Frequently Asked
The standard does not mandate specific oils or fats but generally uses common edible oils and fats such as vegetable oils and animal fats to replicate real-world exposure. The test involves applying pools approximately 25 mm in diameter on the coated panel, maintaining them at 27 ± 2°C for 24 hours, then removing and cleaning the areas with a 0.5% dilute acetic acid solution before polishing and visual inspection.
Test panels should be at least 250 mm by 150 mm with a thickness of 10 mm, possessing a flat surface. Circular test areas of 25 mm diameter should be spaced at least 50 mm apart and 40 mm from edges. The substrate and finishing system are applied following IS 2338 (Part I)-1967. After final coating, panels must be aged at a temperature of 15°C or higher with free air exposure for a minimum of 28 days before commencing oil/fat exposure.
After exposure to oil or fat pools for 24 hours at 27 ± 2°C and subsequent cleaning with absorbent paper and 0.5% acetic acid solution, the test area is visually inspected at 90° and 30° angles under bright daylight. A finish passes if there is no visible marking, discoloration, or any form of disfigurement. Any visible damage constitutes a failure. If the first test fails, a retest on a new panel is required; a second failure results in rejection of the finish.
The finish’s final coat must undergo aging at room temperature not lower than 15°C with unimpeded air circulation. The minimum aging period is 28 days, ensuring the coating is fully cured and stable prior to testing its resistance to oils and fats.
Following a 24-hour exposure at 27 ± 2°C, oil or fat residues are removed using soft absorbent cloth or paper. The test spots are then gently rubbed with a cloth moistened in 0.5% acetic acid solution, followed by light polishing with a dry soft cloth. Finally, the test areas are inspected visually at 90° and 30° angles under bright natural daylight for any discoloration, marking, or surface damage.
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