Colour Fastness to Dry Cleaning Solvent Testing
topic
Dry cleaning solvent fastness (ISO 105-D01, perchloroethylene PERC; ISO 105-D02, solvent + water; AATCC TM132) tests dye retention and adjacent fabric staining when textiles are agitated in professional dry cleaning solvents — verifying that garments labelled 'dry clean only' or 'P process dry clean' will survive professional cleaning without colour bleeding or self-discolouration. ISO 105-D01 procedure: specimen (40 mm × 100 mm) plus white cotton adjacent fabric, placed in 200 mL perchloroethylene (PERC, tetrachloroethylene, bp 121°C) in Gyrowash machine stainless steel container with 12 steel balls, agitated at 30°C for 30 minutes — specimen removed, squeezed, dried at 60°C, assessed for colour change and cotton adjacent fabric staining. PERC solvent fastness failure mechanisms: disperse dyes on acetate (triacetate, diacetate fibres) dissolve partially in PERC — acetate/PERC interaction high because PERC swells acetate polymer matrix allowing dye diffusion (grade 2–3 typical for disperse-dyed diacetate); reactive dyes on cotton PERC fastness grade 4–5 (non-substantive for organic solvents — ionic reactive-cellulose bond unaffected by non-polar solvent); acid dyes on wool grade 3–4 (wool protein swells minimally in PERC — reasonable retention). ISO 105-D02 (wet cleaning simulation, PERC + 0.5% water): water addition increases polarity, enhancing dye extraction from protein fibres — wool acid dye grade 2–3 in ISO 105-D02 versus 3–4 in D01. Hydrocarbon dry cleaning (Stoddard solvent or DF-2000 used by eco-dry cleaners replacing PERC for environmental reasons): ISO 105-D03 (not widely used) — Stoddard fastness generally superior to PERC for acetate and protein fibres because hydrocarbon lower polarity reduces dye extraction. AATCC TM 132 (dry cleaning perchloroethylene, identical principle, commercial American specification): dye bleeding quantified by measuring PERC solution absorbance after test — quantitative dye extraction measure supplementing grey scale visual assessment.
Role
Dry cleaning fastness testing validates the care label 'dry clean' claim by verifying that professional PERC cleaning neither changes the garment colour nor contaminates the dry cleaner's solvent with sufficient dye to stain other items in the same cleaning load — with dry cleaning fastness failure creating dyehouse liability for professional cleaning damage claims worth $50–500 per garment for high-value tailored suits and fashion outerwear.