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CAN CGSB 4.2 No. 48-2013 Standard: Testing for Pilling Resistance in Textiles
Understanding the Brush and Sponge Method for Evaluating Surface Changes on Fabrics
Scope and Purpose
CAN CGSB 4.2 No. 48-2013, part of the Canadian General Standards Board (CGSB) series of textile test methods, specifies a procedure for assessing the resistance of textile fabrics to pilling and other related surface changes using the brush and sponge method. This standard applies to most woven and knitted fabrics, particularly those prone to fuzzing and pilling during wear and care.
The primary objective of the test is to simulate the abrasive action that occurs during normal use, which can cause fibres to tangle into small balls (pills) on the fabric surface. The brush and sponge method subjects a conditioned specimen to controlled rotary abrasion using a nylon brush and a sponge pad. The resulting surface change is then visually evaluated against standard reference images or physical rating scales.
Tip: This method is particularly useful for quality control in garment and home textile manufacturing, as it provides a repeatable assessment of a fabric’s propensity to pill under end-use conditions.
The standard is intended for use by textile laboratories, manufacturers, and quality assurance professionals. It does not correlate directly with wear trials but offers a standardized laboratory simulation that enables comparison between different fabric constructions, finishes, and fibre compositions.
Technical Requirements and Test Procedure
Apparatus and Conditioning
The test requires a brush and sponge pilling tester comprising a rotating brush (usually nylon) and a sponge pad mounted on a platform that rotates at a specified speed. A specimen holder ensures uniform pressure. Prior to testing, specimens must be conditioned at 20 ± 2 °C and 65 ± 4 % relative humidity for at least 24 hours. At least three specimens per fabric direction (warp, weft, and bias) are recommended for reliable results.
Test Execution
The standard defines a specific sequence: the specimen is placed on the sponge pad, the brush is brought into contact, and the assembly rotates for a predetermined number of cycles (commonly 100 or 200 revolutions). After the rotational phase, loose fibres are removed carefully, and the specimen is allowed to rest for a short period before evaluation. Parameters such as brush pressure, rotation speed, and number of cycles are specified in the standard.
Evaluation and Rating
The extent of pilling and surface change is rated using a 1-to-5 scale, where 5 represents no pilling and 1 represents severe pilling. Ratings are performed under standardized lighting by trained observers, often using a set of photographic reference standards provided in the standard. The final result is reported as the median or average rating for all specimens.
Important: The evaluation is subjective; however, the standard provides detailed verbal descriptions of each rating level to minimize inter-laboratory variation. For critical comparisons, a panel of three observers is recommended.
Implementation Highlights
When implementing CAN CGSB 4.2 No. 48-2013 in a laboratory or quality control environment, the following points are essential:
- Calibration: The brush and sponge pilling tester must be calibrated for rotational speed and brush pressure at regular intervals, as specified by the manufacturer.
- Specimen Preparation: Use a die cutter or template to produce circular specimens of the required size (typically 140 mm diameter). Avoid testing areas with creases or yarn defects.
- Reference Standards: Always use the most current version of the reference photographic or physical rating scales provided in the standard.
- Reporting: Report the average rating and any observed fuzzing, pilling, or other surface changes such as matting or colour alteration.
Good practice: Include a known reference fabric of known pilling performance with each test series to verify the test system’s consistency.
The table below summarizes the key test parameters and their typical values according to the standard:
| Parameter | Specification |
|---|---|
| Brush type | Nylon bristles, 0.35 mm diameter, 11 mm length |
| Sponge pad | Polyurethane foam, 6 mm thickness, Shore A 20–25 |
| Rotational speed | 120 ± 10 rev/min |
| Number of cycles | 100 (standard), 200 (heavy abrasion) |
| Brush pressure | 6 N ± 0.5 N |
| Specimen size | 140 mm diameter |
| Conditioning | 20 ± 2 °C, 65 ± 4 % RH for 24 h |
| Rating scale | 1 (severe pilling) to 5 (no pilling) |
Caution: Do not use this test for fabrics that are excessively hairy, heavily napped, or contain loose fibres that may give misleading results. In such cases, alternative methods (e.g., CGSB 4.2 No. 49 – Random Tumble Pilling Test) should be considered.
Compliance and Notes
CAN CGSB 4.2 No. 48-2013 is a voluntary national standard of Canada. While not mandatory by law, it is frequently referenced in contractual specifications between textile suppliers, manufacturers, and retailers. Compliance demonstrates a commitment to quality and consistency in product evaluation.
Key compliance requirements:
- Use of a properly maintained and calibrated brush and sponge pilling tester.
- Testing by trained personnel familiar with the rating scales and subjective assessment.
- Full documentation of test conditions, number of specimens, and individual ratings.
- Retaining reference photographs and/or physical standards for each test series.
Adherence to the standard ensures that test results are reproducible and comparable across different laboratories. It is recommended that laboratories participate in inter-laboratory proficiency programs to validate their rating consistency.
Tip: When writing specifications, always include the exact standard number and year (CAN CGSB 4.2 No. 48-2013) to avoid ambiguity. Also reference the number of cycles required for your product type.
In summary, CAN CGSB 4.2 No. 48-2013 provides a reliable laboratory method for evaluating the pilling resistance of textile fabrics. By following the standardized brush and sponge procedure, manufacturers and quality professionals can assess fabric surface change performance, aid product development, and ensure consistent quality in the marketplace.
Q: What types of fabrics are suitable for this test method?
A: The brush and sponge method is applicable to most woven and knitted fabrics, particularly those that are relatively flat and not excessively hairy. For high-pile or napped fabrics, alternative methods such as the random tumble pilling test (CGSB 4.2 No. 49) are more appropriate.
A: The brush and sponge method is applicable to most woven and knitted fabrics, particularly those that are relatively flat and not excessively hairy. For high-pile or napped fabrics, alternative methods such as the random tumble pilling test (CGSB 4.2 No. 49) are more appropriate.
Q: How many specimens should be tested to obtain a reliable result?
A: The standard recommends at least three specimens per fabric direction. For fabric that is not directionally sensitive, three to five specimens are sufficient. More specimens can improve statistical confidence, especially for variable fabrics.
A: The standard recommends at least three specimens per fabric direction. For fabric that is not directionally sensitive, three to five specimens are sufficient. More specimens can improve statistical confidence, especially for variable fabrics.
Q: Can this standard be used for international trade?
A: Yes, though it is a Canadian standard, it is recognized internationally. However, buyers may specify other standards such as ASTM D4970 (Martindale method) or ISO 12945-1 (ICRU method). It is important to agree on the test method in advance.
A: Yes, though it is a Canadian standard, it is recognized internationally. However, buyers may specify other standards such as ASTM D4970 (Martindale method) or ISO 12945-1 (ICRU method). It is important to agree on the test method in advance.
Q: Is the rating scale purely subjective?
A: While the evaluation involves subjective judgment, the standard provides photographic references and detailed verbal descriptions for each rating level to minimize variability. Some laboratories use three operators and report the median rating to further increase objectivity.
A: While the evaluation involves subjective judgment, the standard provides photographic references and detailed verbal descriptions for each rating level to minimize variability. Some laboratories use three operators and report the median rating to further increase objectivity.
Published by — Canadian General Standards Board
Year of publication — 2013 (confirmed 2026 reference)