How is the weight of 1.5 oz calculated?? "cloth is sold according to its weight per square yard" this is 11.5 oz/sy?!

Yes woven cloth and roving are specified differently. Chopped strand mat is specified in either grams per square meter or ounces per square foot. In the case of this product it would be 450 grams per square meter or 1.5 oz per square foot. We also offer a 1 oz version of this product (also epoxy compatible but the product page is out of date) it is ASIN: B01N20MS32. I hope this answers your question.

can you lay carpet on this? If so what kind of carpet glue should I use on boat carpet? Can this be applied to treated plyboard?ly

This cloth can be applied to wood or metal using fiberglass resin. Carpet can be applied as with any other smooth surface. I don't know of a specific adhesive for marine carpet.

Does this product use a styrene binder? Can I use it with epoxy?

It has a silane binder that is compatible with polyester, epoxy and vinylester resins. It is powder bound so it comes apart a little easier than emulsion bound and wets out easily.

Could you use this to reinforce craft concrete or concrete slabs?

I think you would want loose fibers for that. Most likely in the 1/2" to 1" length.

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1.5 Oz. Fiberglass Chopped Strand Mat - 3 Yards X 50" Wide for Hand Layup, Vacuum Bagging or Molding Composites with Epoxy, Polyester or Vinyl Ester Resins

Product ID: 549329167

Details

Brand
Griffco
Item Form
Roll
Item Thickness
0.05 Inches
Material
Fiberglass
Shape
Sheet

📏3 yards continuous length

🔄uniform strength & stiffness

🛠️1.5 oz lightweight strength

Description

🛠️ Reinforce your projects with precision and ease — don’t get left behind!

SEAMLESS 3 YARD ROLL - Uninterrupted 50" width for large-scale projects without breaks
LIGHTWEIGHT YET DURABLE - 1.5 oz fiberglass mat balances ease of handling with robust reinforcement
SUPERIOR MOLD CONFORMITY - Outperforms woven roving by hugging mold details for flawless finishes
MULTI RESIN COMPATIBILITY - Perfectly bonds with epoxy, polyester, and vinyl ester resins for versatile use
PRECISION THICKNESS BUILD UP - Adds consistent 0.045" thickness per layer for controlled composite strength

This 1.5 oz fiberglass chopped strand mat from Griffco Products offers a continuous 3-yard by 50" wide roll designed for hand layup, vacuum bagging, and molding with epoxy, polyester, or vinyl ester resins. Engineered for uniform strength and stiffness, it provides a reliable 'print through' barrier and bond layer, conforming better to mold details than woven roving. Ideal for transportation, marine, recreation, and construction industries, it delivers consistent thickness build-up and professional-grade reinforcement.

Specifications

ASIN	B07GN1BLC4
Brand Name	Griffco Products
Customer Reviews	4.7 4.7 out of 5 stars (464)
Global Trade Identification Number	00867327000331
Grade Rating	Industrial
Item Form	Roll
Item Shape	Sheet
Item Thickness	0.05 Inches
Item Weight	3.52 Pounds
Manufacturer	Griffco Products
Material Type	Fiberglass
Model Number	CSM450GW1270MM
Number of Items	1
Part Number	CSM450GW1270MM

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