IS 101 Part 1/Sec 1 : 1986Methods of sampling and test for paints, varnishes and related products: Part 1 Tests on liquid paints (General characteristics) Section 1 Sampling, Preparation of test panels, etc.
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IS 101:1986 Part 1/Sec 1 is the Indian Standard (BIS) for methods of sampling and test for paints, varnishes and related products: part 1 tests on liquid paints (general characteristics) section 1 sampling, preparation of test panels, etc.. This part of IS 101 specifies the procedures for sampling liquid paints, varnishes, and related products, and establishes standard methods for preparing test panels. It is essential for QA/QC engineers and material laboratories to ensure that extracted samples are representative and applied to uniform surfaces for accurate and reproducible testing.
Specifies methods for sampling, preparing test panels, determining consistency, volatile matter, mass per 10 litres, spreading power and finish of liquid paints.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Painting, Coatings and Surface Finishing
! Always remove any surface skin from the paint before mixing and sampling to avoid contaminating the sample with cured particles.
! Test panels must be meticulously degreased and sanded as specified; residual oil, moisture, or rust will invalidate adhesion and surface finish tests.
! Thorough stirring is critical prior to sampling because pigments and heavy extenders tend to settle at the bottom of the container over time.
ISO 15528:2020ISO (International Organization for Standardization)
HighCurrent
Paints, varnishes and raw materials for paints and varnishes — Sampling
Directly corresponds to the sampling procedures for liquid paints described in IS 101.
ISO 1513:2022ISO (International Organization for Standardization)
HighCurrent
Paints and varnishes — Examination and preparation of test samples
Covers the examination and preparation of samples for testing, equivalent to clauses 3 & 4 of the IS code.
ISO 1514:2022ISO (International Organization for Standardization)
HighCurrent
Paints and varnishes — Standard panels for testing
Details the requirements for standard test panels, equivalent to clause 5 of the IS code.
ASTM D3925-14(2020)ASTM International (American Society for Testing and Materials), USA
MediumCurrent
Standard Practice for Sampling Liquid Paints and Related Pigmented Coatings
Focuses specifically on the practice of sampling liquid paints, similar to the sampling section of IS 101.
Key Differences
≠The Indian Standard combines sampling, sample examination, and test panel preparation into a single document. Modern international practice separates these topics into distinct standards (ISO 15528 for sampling, ISO 1513 for examination, ISO 1514 for panels).
≠ISO standards provide much more detailed specifications for sampling equipment (e.g., types of sampling tubes) and procedures for different container types, whereas IS 101 is more general in its descriptions.
≠ISO 1514 lists a wider variety of standard panel substrates (steel, aluminum, glass, wood, plastic) and references other specific ISO standards for their material properties and pre-treatment, which is more comprehensive than the IS code's list.
≠The international standards (ISO/ASTM) are regularly updated (e.g., 2020s), reflecting current technology, safety practices, and terminology. IS 101:1986 is significantly older and has not been revised to incorporate these advancements.
Key Similarities
≈All standards share the fundamental objective of ensuring a representative sample is taken and prepared in a standardized manner to yield reproducible test results.
≈Both the IS code and its international counterparts emphasize the critical need for thorough mixing of the material before taking a sub-sample for laboratory testing.
≈The requirement to clearly label sample containers with essential information such as product name, batch/lot number, date of sampling, and source is a common and mandatory procedure in all standards.
≈The underlying principle of using clean, uniformly prepared test panels as a consistent substrate for applying coatings for testing is a core similarity across all mentioned standards.
Parameter Comparison
Parameter
IS Value
International
Source
Minimum Laboratory Sample Size
Not less than 250 ml.
To be agreed between parties; typically 500 ml or 1 litre to allow for multiple tests.
ISO 15528:2020
Sampling Levels in Large Containers
From top, middle and bottom levels.
Specified levels: 10% from the surface, middle of the container, and 10% from the bottom.
ISO 15528:2020
Standard Mild Steel Panel Thickness
Approximately 1.25 mm thick (18 BG).
Typically 0.8 mm ± 0.07 mm for cold-rolled steel (references ISO 3574). Emphasis on consistency.
ISO 1514:2022
Panel Cleaning Solvent
A suitable hydrocarbon solvent (like mineral turpentine).
Specifies suitable aromatic hydrocarbons (xylene) or aliphatic/aromatic mixtures, and explicitly prohibits chlorinated solvents.
ISO 1514:2022
Time Limit for Testing
As soon as possible, but not later than seven days after receipt.
No maximum holding time specified; focuses on conditioning the sample at standard temperature (23 ± 2)°C for a defined period (e.g., 24h) before testing.
ISO 1513:2022
Sample Container Material
Clean, dry, wide-mouthed containers of glass or tinplate.
Containers made of material that will not react with the sample (e.g., glass, certain plastics, lacquered metal), with considerations for light sensitivity.
ISO 15528:2020
⚠ Verify details from original standards before use
Key Values4
Quick Reference Values
Standard mild steel test panel dimensions150 mm x 100 mm x 1.25 mm
Standard glass test panel dimensions150 mm x 100 mm
Standard tinplate test panel dimensions150 mm x 100 mm x 0.30 mm
Minimum representative sample size500 ml
Tables & Referenced Sections
Key Tables
No tables data
Key Clauses
Clause 3 - Sampling equipment
Clause 4 - Procedure for sampling
Clause 5 - Preparation of test panels
Clause 5.2 - Material for test panels (Steel, Tinplate, Glass, Wood)