Common Defects in Rugs and Carpets: Classes and Causes

Key takeaways

Construction decides the defects: hand-tufted rugs fail at the latex, hand-knotted rugs at size and dye, braided rugs at the joins and flatness.
Mould, live moth larvae, a needle in the pile and a false fibre claim are critical findings.
Abrash is a banded colour change in hand-dyed wool, not a dye fault. Agree how much is acceptable before production.
Many rug defects come from drying, curing and packing. Rugs rolled warm or damp arrive with odour, mould or crush lines.

How to use this defect library

Each table lists a defect, where it shows on the rug, how an inspector finds it, the class it is usually given and how the factory can prevent it. A critical defect can harm a user or breaks a legal rule; a major defect is likely to cause a return; a minor defect is visible but does not stop the sale. Your defect list decides the final class.

Every sampled rug is unrolled on a clean floor, left to relax, then measured and checked on the face and the back. Sample sizes follow ISO 2859-1; see AQL sampling explained. For how each construction is made and checked, see rug and carpet inspection.

Size, shape and lie

Defect	Where it shows	How it is found	Usual class	How to prevent it
Size outside tolerance or out of square	Hand-knotted and flatweave rugs after washing	Length and width at several points; both diagonals	Major	Stretch and block after washing; state the tolerance in the order
Rippling that does not relax	Dhurries, hand-knotted rugs	Rug laid flat and left to settle	Major	Even warp tension and beating on the loom
Edges curling	Hand-tufted and outdoor rugs	Corners and edges checked after relaxing	Major	Even latex spread; binding not too tight
Pulled-in sides	Flatweaves	Width measured along the length	Major	Weft not drawn too tight at the edges
Cupping or doming of rounds and ovals	Braided and jute rugs	Laid flat; centre and edges checked	Major	Even turns while coiling; check the first pieces in production
Permanent crush lines	Shaggy and viscose rugs	Unrolled and left to recover	Minor if it recovers, major if not	Roll, do not fold; do not overpack

Pile, face, backing and edges

Defect	Where it shows	How it is found	Usual class	How to prevent it
Tufts or pile pulling out	Hand-tufted, hand-loomed, bath mats	Light pull on tufts in several areas	Major	Latex reaching the tuft roots; firm weft
Secondary backing peeling	Hand-tufted and machine-made rugs	Corners and edges lifted by hand	Major	Enough latex; press before the latex skins over
Knot count below the agreed figure	Hand-knotted and silk rugs	Knots counted on the back over a set length	Major	Knot count in the order, checked on the first rugs
Design error or wrong-colour knots	Face, against the approved sample	Face compared with the sample and the design map	Major	Clear design map; check during weaving
Weight or pile height below specification	Shaggy, outdoor, machine-made	Weighed and measured against the specification	Major	State weight per square metre and pile height
Braids separated along a join	Braided rugs	Joins flexed and pulled by hand	Major	Close lacing or stitching
Uneven fringe, loose binding stitch	Ends and sides	Visual	Minor	Finishing check before packing

Colour, dye and abrash

Defect	Where it shows	How it is found	Usual class	How to prevent it
Dye bleeding	Deep colours into a white ground or fringe	Wet white cloth rubbed on the face	Major	Fix and wash dyes; check dyed yarn before weaving
Shade band beyond the agreed abrash	Across the width of hand-knotted rugs	Viewed from both ends against the sample	Major or minor by strength	Dye enough yarn per lot; agree abrash limits
Sheen stripe from mixed yarn lots	Viscose and silk pile	Rug viewed at a low angle from both ends	Major	One yarn lot per rug
Water ring or tide mark	Viscose and silk after washing	Visual on the face	Major	Controlled washing and fast, even drying
Shade step between lots	Machine-made carpet rolls	Rolls compared side by side	Major	Ship one dye lot per order or per room

Abrash is the gentle banded change that appears when a weaver moves to a new batch of hand-dyed wool, and many buyers accept it. A dye fault is patchy, has hard edges or shows as a halo or stain. If your order is silent on abrash, a strong band is reported as a Hold for you to decide.

Labels, claims and contamination

Defect	Where it shows	How it is found	Usual class	How to prevent it
Viscose labelled as silk or bamboo	Labels and paperwork of silk and viscose rugs	Burn test on loose yarn as a screen; lab confirms	Critical	Name the real fibre on every label
Hand-loomed rug described as hand-knotted	Labels and invoices	Back checked for knots	Critical	Construction stated in the order and on labels
Needle, pin or blade fragment in the rug	Tufted, braided and rag rugs	Hand run; metal detector where required	Critical	Needle control; broken parts recovered
Active mould or mildew	Jute, cotton, shaggy rugs and bath mats	Visual and smell; moisture meter	Critical	Dry fully before rolling; dry store
Live moth larvae	Wool rugs and namdas	Pile and back checked; cartons opened	Critical	Clean, dry storage; treatment as agreed
Strong odour	Latex-backed and jute rugs	Smell on unrolling	Major	Cure latex fully; do not roll warm
Missing fibre or origin label	Back of the rug	Labels checked against the order	Major	Label artwork approved before production

US rules on fibre labels and surface flammability (16 CFR 1630 and 1631) are explained on the rug inspection page; the flammability test is done by a lab, and the inspector checks that the report covers the same construction. For EU fibre names, see EU textile labelling.

Preventing rug defects before the final inspection

Most rug defects cannot be reworked once the rug is finished. A rug that ripples because of warp tension, or a braided oval that cups, stays that way. Three steps cut the risk:

Agree limits in writing. Size tolerance, knot count, weight per square metre, abrash, and natural variation for rag, jute and handmade rugs, with approved samples. See golden samples and approved samples.
Inspect the first finished pieces. A during-production inspection finds curling, cupping and backing faults while the rest can still change. See when to book a during-production inspection.
Check drying and packing. Rugs rolled warm, damp or with uncured latex arrive with mould, odour or crush lines.

Rugs are made in Bhadohi, Mirzapur, Panipat, Jaipur and other centres; see Bhadohi and Mirzapur. Book an inspection anywhere in India; travel is set by travel band.

Sources

Frequently asked questions

Is abrash a defect in a hand-knotted rug?

Not in itself. Abrash is a banded colour change from hand-dyed wool lots and is part of the rug's character. It becomes a defect when it is stronger than the limit you agreed. A patchy or hard-edged change is a dye fault, not abrash.

Why do hand-tufted rugs curl at the edges?

Usually because latex was spread unevenly, the binding was sewn too tight, or the rug was cut out of square. Curling is classed major and is hard to fix after finishing, so check the first pieces during production.

How is dye bleeding checked at the factory?

The inspector rubs a wet white cloth on deep colours and looks for colour on the cloth. It is a screen. Colour fastness to a test method and grade is measured by a lab on samples the inspector pulls and seals.

Is mould on a rug a critical defect?

Active mould is usually critical for the lot, because it spreads in a closed container and is a health complaint. The inspector checks moisture, smell and cartons, and the lot may need drying and repacking before it ships.

Can an inspector tell viscose from silk?

A burn test on loose yarn gives a strong indication, and it is a screen only. A lab confirms fibre content. A rug labelled silk that is viscose is a critical, mislabelling defect.

Know before it ships

Tell us the product, the factory's city and your ready date. We confirm the inspector, the notice time and the price before you book.

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Common defects in rugs and carpets