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Fiber & Material Science · Data Table
Moisture Regain of Common Scarf Fibers
Regain percentages for 12 common scarf fibers at standard conditions (65% RH, 20°C), with implications for comfort, weight specification, and care labeling.
Fiber & Material Science — Data Table
Moisture Regain — Concepts and Commercial Implications
Moisture regain is a fundamental fiber property that affects comfort, weight specification accuracy, care label requirements, and colorfastness testing. Understanding the regain differences between fiber types prevents specification errors and helps buyers compare fiber costs on a dry-weight basis.
MR-01
What Moisture Regain Means
Moisture regain (MR%) is the weight of moisture absorbed by a fiber expressed as a percentage of its oven-dry weight, measured at standard conditions (65% RH, 20°C per ISO 139). A fiber with MR 8% absorbs moisture equivalent to 8% of its dry mass before it begins to feel damp. High MR% fibers (wool, cashmere, cotton) maintain comfort in humid conditions by absorbing sweat vapour without feeling wet. Low MR% fibers (polyester, polypropylene) remain moisture-neutral but may feel clammy in warm, humid conditions.
MR% = (conditioned weight − oven-dry weight) ÷ oven-dry weight × 100
65% RH / 20°C
Standard Test Conditions
MR = (wet−dry)/dry × 100
Calculation Formula
High MR
= Better Humidity Comfort
ISO 139
Conditioning Standard
MR-02
Moisture Regain and Commercial Weight
Because fibers absorb atmospheric moisture, the actual weight of yarn or fabric includes moisture content. Commercial weight = oven-dry weight × (1 + Regain%/100) × (1 + Commercial Allowance%/100). Most fiber trade uses a commercially agreed regain — not measured regain — for invoicing. Wool commercial regain = 18.25% (IWTO standard); cotton = 8.5%. A lot of wool yarn invoiced at 100 kg actually contains approximately 84.5 kg of dry fiber. Buyers comparing fiber costs across fiber types should normalize to oven-dry weight to avoid distorted cost comparisons.
18.25%
Wool Commercial Regain (IWTO)
8.5%
Cotton Commercial Regain
0.8%
Polyester Commercial Regain
IWTO / ISO
Trade Standards Authority
MR-03
Regain and Care Label Implications
High-moisture-regain fibers (wool, cashmere) swell dimensionally when wet, increasing felting risk under mechanical agitation. This drives care label requirements for hand washing or dry cleaning. Low-regain synthetics (polyester, nylon) do not swell — they can be machine washed without significant dimensional change risk. Cotton has intermediate regain and responds to pre-shrinking treatment, enabling machine wash care labels. Care label temperature limits are calibrated to manage both fiber swelling and dye stability in combination.
Wool: dry clean
High Regain — Care Requirement
Cotton: machine 40°C
Post-Preshrink
Polyester: machine 40°C
Low Regain — Machine Safe
ISO 3758
Care Symbol Standard
Reference Data
Moisture Regain Data Tables
Reference data for 12 common scarf fibers at standard ISO 139 conditions (65% RH, 20°C), with commercial regain allowances and practical implications for care and comfort.
Table 1 — Moisture Regain Reference: 12 Common Scarf Fibers (ISO 139 standard conditions)
| Fiber | MR% at 65% RH / 20°C | Commercial Regain | Comfort in Humidity | Care Implication |
|---|---|---|---|---|
| Cashmere | 14–19% | 17% | Excellent | Dry clean preferred |
| Wool (Merino) | 11–17% | 18.25% | Excellent | Hand wash / dry clean |
| Cotton | 7–8% | 8.5% | Good | Machine wash 40°C |
| Silk | 9–11% | 11% | Very good | Dry clean / gentle hand |
| Modal | 10–13% | 13% | Very good | Machine wash 40°C |
| Lyocell (Tencel) | 11–13% | 13% | Very good | Machine wash 30°C |
| Viscose (Rayon) | 12–15% | 13% | Very good | Hand wash / gentle |
| Linen | 9–12% | 12% | Very good | Machine wash 40°C |
| Acrylic | 1.0–2.5% | 2% | Poor | Machine wash 30°C |
| Polyester | 0.4% | 0.8% | Very poor | Machine wash 40°C |
| Nylon 6,6 | 3.5–4.5% | 4.5% | Moderate | Machine wash 30°C |
| Polypropylene | <0.1% | 0% | Very poor | Machine wash 30°C |
Table 2 — Regain Range Effect on Key Scarf Properties
| Moisture Regain Range | Fiber Examples | Hand Feel in Humidity | Dimensional Stability (Wet) | Felting Risk | Drying Speed |
|---|---|---|---|---|---|
| Very High (>12%) | Cashmere, wool, viscose | Comfortable | Low | High | Slow |
| High (8–12%) | Cotton, silk, linen, lyocell | Good | Medium | Low | Medium |
| Medium (3–8%) | Nylon | Moderate | High | None | Medium-fast |
| Low (<3%) | Acrylic, polyester | Clammy in heat | Very high | None | Fast |
Common Misconceptions
Moisture Regain — Myths vs. Facts
Four common misconceptions about moisture regain that affect fiber selection, weight specification, and care label decisions.
Myth
“Low moisture regain means better fabric performance.”
Fact
Low regain means better dimensional stability when wet — but worse moisture comfort. Polyester’s 0.4% regain is excellent for dimensional stability but produces a clammy feel in warm, humid conditions. The ideal regain depends entirely on the product’s end use and climate.
Myth
“A fiber with high moisture regain will feel wet when worn.”
Fact
Moisture regain measures absorption at standard conditions — 65% RH, 20°C. At these conditions, wool with 16% regain does not feel wet. The moisture is absorbed within the fiber structure. The fiber feels damp only when regain exceeds the standard condition measurement — in high humidity or after perspiration.
Myth
“Moisture regain has no impact on yarn or fabric weight.”
Fact
Moisture content directly adds to fabric weight. A 100 g cotton fabric has approximately 7–8 g of absorbed moisture at standard conditions. Fabric weight specifications must state whether they are at conditioned (with regain) or oven-dry weight — and should always be measured at standard ISO conditions for comparability.
Myth
“All synthetic fibers have the same moisture behavior.”
Fact
Regain varies significantly across synthetics: polypropylene <0.1%, polyester 0.4%, acrylic 1–2.5%, nylon 3.5–4.5%. Nylon’s moderate regain gives it better moisture comfort than polyester or acrylic — relevant for sports scarves and accessories worn during physical activity.
Frequently Asked Questions
Moisture Regain — Buyer FAQ
Common questions from scarf buyers and product developers on moisture regain data and its practical implications.
What is moisture regain and how is it measured?
Moisture regain (MR%) is the weight of absorbed moisture as a percentage of oven-dry fiber weight, measured after conditioning at 65% RH and 20°C per ISO 139. The fiber is dried at 105°C to constant weight (oven-dry), then conditioned at standard atmosphere until equilibrium. MR% = (conditioned weight − oven-dry weight) / oven-dry weight × 100.
Why does wool have such high moisture regain?
Wool’s keratin protein structure contains abundant amide groups (–CO–NH–) that are strongly hydrophilic — they attract and hold water molecules through hydrogen bonding. Additionally, wool’s cortex (inner fiber) can absorb more moisture than its surface cuticle reveals — meaning wool can absorb 30%+ of its weight in moisture before it begins to feel damp at the surface.
How does moisture regain affect scarf care labels?
High-regain fibers (wool, cashmere) swell when wet and felt under agitation — requiring gentle or dry-clean care labels per ISO 3758. Low-regain synthetics (polyester) do not swell — machine washing at 40°C is safe. Cotton’s intermediate regain and swelling behavior is managed by pre-shrinking, allowing machine wash care labels.
Does moisture regain affect colorfastness testing?
Yes. ISO 105 colorfastness tests require fabrics to be conditioned at standard atmosphere (ISO 139) before testing, ensuring moisture content is consistent across laboratories. Testing dry or wet samples without conditioning produces non-reproducible results — this is why accredited labs include conditioning time before all colorfastness measurements.
What is the commercial moisture regain for cashmere?
The standard commercial regain for cashmere is 17% (CCMI / IWTO basis). This means that in commercial trade, cashmere fiber is invoiced at 17% moisture content above oven-dry weight. When buying by weight, understanding commercial regain prevents confusion between apparent weight and dry fiber mass — and allows accurate cost comparison with other fiber types.
Related Guides
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Explore related topics in fiber science, thermal performance, and compliance for scarf sourcing.
References & Standards
- ISO 139:2005 — Standard atmospheres for conditioning and testing textiles. iso.org
- ISO 6741:2017 — Textiles: Fibres and yarns — Determination of mass per unit length. iso.org
- IWTO — Commercial Regain Standards for Wool Fibers. iwto.org
- Cotton Incorporated — Moisture and Cotton Textile Properties. cottoninc.com
- Textile Institute — Fiber Science reference data, Manchester, UK.
See this standard applied in production: WeaveEssence factory technical records include test reports and process data relevant to this guide. Contact the technical team for specification-specific documentation.