Overview
ISO 7768:2009 - Textiles: Test method for assessing the smoothness appearance of fabrics after cleansing specifies a standardized, visual test method to evaluate how well a fabric retains its original smooth appearance after one or more cleansing treatments. The method is designed primarily for use with Type B domestic washing machines (ISO 6330) but may also be applied with Type A machines or professional cleaning procedures (ISO 3175). The standard helps quantify “mussiness” and ironing effort by assigning an SA rating using three‑dimensional replicas.
Key topics and requirements
- Scope: Assessment of retention of original smooth appearance after domestic or professional cleansing.
- Test specimens: Prepare three specimens (38 cm × 38 cm), cut parallel to length, pinked to prevent fraying and marked for length direction.
- Cleansing cycles: Treat specimens using agreed ISO 6330 (domestic) or ISO 3175 (professional) procedures. Optionally repeat up to four additional cycles (total five).
- Conditioning: Condition specimens 4–24 hours per ISO 139; hang unfolded with length vertical.
- Viewing and lighting: Darkened room with overhead lighting-two CW fluorescent lamps and a grey viewing board matched to No. 2 of the ISO 105‑A03 grey scale.
- Replicas and ratings: Use three‑dimensional smoothness replicas (SA‑1 to SA‑5). Three independent observers rate each specimen by comparison to replicas; half-step ratings permitted (e.g., 3.5).
- Result calculation: Average the nine observations (3 observers × 3 specimens) and report to the nearest half rating.
- Precision and traceability: Annex A summarizes inter‑laboratory precision (critical differences) and Annex B provides a digital description of replicas and scanning/measurement method.
Practical applications and users
Who benefits from ISO 7768:2009:
- Textile and apparel manufacturers - quality control of finishes, low‑iron and easy‑care claims.
- Testing laboratories - standardized method for repeatable, comparable smoothness ratings.
- R&D teams - compare fabric constructions, finishes, or detergents for post‑wash appearance.
- Professional care providers and laundries - evaluate effects of cleaning processes on appearance.
- Retailers and brand compliance - verify performance statements related to wash‑care and ironing effort.
Practical uses:
- Validating finish durability (e.g., wrinkle‑resistant finishes) after repeated launderings.
- Comparing washing procedures and detergents for consumer guidance.
- Supporting product specifications and marketing claims about “easy‑care” or “no‑iron” performance.
Related standards
- ISO 6330 - Domestic washing and drying procedures for textile testing (Type A/B machines)
- ISO 3175 (all parts) - Professional care (drycleaning and wetcleaning)
- ISO 139 - Standard atmospheres for conditioning and testing
- ISO 105‑A03 - Grey scale for assessing staining (used for viewing board color)
Keywords: ISO 7768:2009, fabric smoothness, smoothness appearance test, textiles test method, domestic washing ISO 6330, ISO 3175, smoothness replicas, SA rating, textile quality control.