Interlock (smooth double-knit)

Weight	180–300 g/m²
Composition	100% polyester (common); elastane-free — stretch comes from the structure.
Knit type	Interlock (smooth double-knit) · Rib
Use class	Everyday
Stretch	Mechanical stretch
Knit	A double-knit where two 1x1 ribs interlock on opposed needles; identical, smooth faces; edges don’t curl.
Hand	Both faces identical, even and smooth; fuller, more stable and more draping than rib.
Typical use	Innerwear · smooth tees/tops · outer-layer linings
Strength	A double-knit giving high dimensional stability, even twin faces and better recovery than plain rib.
Watch for	Stretches notably less than rib; it is a smooth-faced double-knit (not ribbed) and is less suited to tight binding than rib. Same structure as the Interlock family.

CertificationsISO 9001ISO 14001ISO 45001OEKO-TEX STePSTANDARD 100GRS · RCS

Width, gauge, finishing options and test standards are shared on request.

Typical technical ranges

Weight tolerance	±5% (typical); ±5–7% may apply on heavy/dense rib and elastane-blended variants
Width	Relaxed open width typically ~70–190 cm; tubular width typically 30–90 cm (Ø). Because rib contracts strongly widthwise, the relaxed width is markedly narrower than off-machine width and is highly sensitive to relax/tension state at measurement
Shrinkage (wash)	Post-wash typically ±5% in length/width (length may show a small positive growth). Due to widthwise recovery, rib can show higher dimensional change in WIDTH than single-jersey; under-set goods may reach −6 to −7% in width, while good heat-setting brings it toward ±3%
Color fastness	Wash ≥4, rubbing (dry) ≥4 / (wet) ≥3–4, light ≥4–5 (grey/blue scale, min). Typically good for disperse-dyed PES; on dark/bright shades wet rub may sit at the lower bound due to sublimation/migration
Abrasion / pilling	Martindale typically ~20,000–40,000+ cycles; pilling typically grade 3–4 / 4 (ISO 12945), dropping toward 3 on textured/bulky yarn. Plain rib face pills relatively well; textured/bulky yarn or surface fuzz pushes it toward the lower bound
Gauge / yarn	Typical machine gauge E14–E24 (coarse cuff/collar rib E14–E18; standard cuff/collar rib E18–E22; fine sport rib up to E24). Yarn typically 75–150 denier PES (DTY textured), 50–75 denier on finer builds; elastane variant adds ~20–40 denier spandex

These ranges are industry-TYPICAL / indicative values based on construction and fiber, not Fersan's binding QC measurements. Exact values are confirmed per order, approved sample and lot-based QC report.

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Fersan Tekstil · www.fersantekstil.com · (0212) 875 43 13