What Is A Good Kpsi In Rugs

The red circles show 2 nodes this is actually only one knot.

What is a good kpsi in rugs.

Designs of good quality rugs vs coarse weave carpets. Kpsi is one of many ways rug experts may evaluate oriental rugs. What rug has the highest knot density. The easiest but the most deceptive of the rug quality indicators is the concept of kpi or knots per square inch kpi is calculated by multiplying the horizontal knot count times the vertical knot count in a one inch area of the carpet.

Bear in mind the knot count descriptions of very coarse to super fine are only relative references. A square inch measurement of a fine rug around 20 20 or 20 21 400kpsi. Most rugs fall between 100 and 200 kpsi. What may be a coarse knot count for a city rug may be considered very fine by tribal rug standards.

Kpsi is also sometimes referred to as knot density and knot count which is somewhat of a quick simplification of what can be a complex equation of understanding quality. The density starts from 25 kpsi and could reach up to more than 1000 kpsi. Knot density is a traditional measure for quality of handmade or knotted pile carpets it refers to the number of knots or knot count per unit of surface area typically either per square inch kpsi or per square centimeter kpsc but also per decimeter or meter kpsd or kpsm number of knots per unit area is directly proportional to the quality of carpet. Again a rug with a lower kpsi value would take less time to make as compared to a rug with a higher kpsi.

Those pieces with 120 to 330 kpsi are rated medium to good while rugs with more than 330 kpsi considered to be of very good quality. That is to say not all countries regions and cities have the same standardized knot density measure of kpsi. The finest rug we ve seen at little persia was a silk chinese rug measuring around 2100 kpsi but most high quality silk rugs are 400 800 kpsi. A 12x12 rug would have 144 kpsi.

Anything below 80 kpsi is considered to be coarse and of low quality. Note that the knotting in some rugs makes them look like they have twice as many knots horizontally than they actually have. In general knot count ranges in rugs from about 25 to over 1 000 kpsi. For best results kpsi should be measured in 3 or more areas to find an average as some rugs have kpsi which vary significantly.

To get a better perspective on the time taken to create a rug a persian rug measuring 9 by 12 and with a 500 kpsi ratio would take about 14 months to complete if worked on by 4 to 5 weavers working an approximate 6 hours a day 6 days.