Canvas is a tightly woven plain-weave fabric, traditionally made from cotton, that is valued for strength and firmness rather than drape. Weights are usually quoted in ounces per square yard and commonly range from around 8 oz for light garment canvas up to 20 oz or more for heavy industrial cloth. In India, cotton canvas is woven in volume around Ahmedabad and elsewhere in Gujarat, in greige, dyed and printed form. Many mills also offer polyester cotton blends and 100 per cent polyester canvas for outdoor use.
Types of canvas you will see quoted
- Plain canvas: a simple one-up one-down weave, often from plied yarns, used for bags, aprons and jackets.
- Duck: a closely woven canvas, usually with paired yarns in the warp, graded by a duck number where a lower number means a heavier cloth.
- Waxed canvas: a finished canvas impregnated with wax for water resistance, popular for bags and outerwear.
- Dyed and printed canvas: usually pigment or vat dyed, for shoe uppers, home textiles and promotional bags.
- Polyester and blended canvas: for awnings, tents and covers where rot resistance and UV stability matter more than handle.
Weights and what they are used for
Light canvas of roughly 7 to 10 oz suits shirts, light jackets, shoe uppers and lined bags. Mid-weight canvas of about 10 to 14 oz is the workhorse for tote bags, aprons, chore jackets and upholstery. Heavy canvas from 14 to 20 oz and above goes into tarpaulins, industrial covers, tool rolls and heavy-duty bags.
To convert, one ounce per square yard is roughly 34 GSM, so a 12 oz canvas is about 400 GSM. Weight alone does not describe quality, though. Two canvases of the same weight can differ a great deal in yarn quality, construction and finish, and a loosely woven heavy canvas can perform worse than a dense lighter one.
What to put in the specification
State the weight with a tolerance, the fibre content, the construction in EPI and PPI, the yarn count and whether the yarn is single or plied. Ask for finished width and whether the cloth is sanforised, because untreated cotton canvas can shrink noticeably on first wash and a bag pattern cut to the wrong size is a costly mistake.
For dyed canvas, specify the fastness levels required to washing, rubbing and light, and agree the dye class in writing. For bags and footwear, ask for tensile and tear strength on the test report rather than taking them on trust. Sealed samples sent for testing before bulk is the cheapest insurance available.
How Creston & Co helps
We audit canvas mills in person before any order is placed, and we send sealed samples of the approved cloth to an NABL-accredited lab for weight, strength and fastness. Rolls are inspected before loading and we supervise the loading at the mill or the port. You get a weekly update through the order, and a free 20-minute sourcing review if you want to talk through a canvas requirement first.