ISO 7768:2009

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.