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 We also offer a 1 oz version of this product (also epoxy compatible but the product page is out of date) it is ASIN: B01N20MS32.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

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

📏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	Griffco Products
Brand Name	Griffco Products
Customer Reviews	4.7 out of 5 stars 463 Reviews
Global Trade Identification Number	00867327000331
Grade Rating	Industrial
Item Form	Roll
Item Shape	Sheet
Item Thickness	0.05 Inches
Item Weight	1.6 kg
Manufacturer	Griffco Products
Material	Fiberglass
Material Type	Fiberglass
Model Number	CSM450GW1270MM
Number of Items	1
Part Number	CSM450GW1270MM
Shape	Sheet

Reviews

D**R

Great

Great product as always. Been using mat for about 2 years now.

14.09.2025

H**I

Love it. So affordable! I have bought this 5 times!

I use this for my GFRC pots. Love it.

18.10.2025

N**E

Great fiberglass

Put a hole in my boat so I started by fixing it using spray foam, one layer of fiberglass and resin, then I use two layers of polyester structural filler to make the surface level. I put three more layers on of fiberglass and resin, and then gel coat and it worked great. Not the prettiest but no water got in the boat.

27.07.2023

J**D

Worth every penny

Put a new wood floor on my boat floor, and this stuff with opoxy worked great, super strong and easy to tear, once cured, it feels super solid, and the amount that is comes with was perfect

19.04.2022

J**C

(POWDER COATED) Chopped strand matting that u can't get anywhere but here, !Epoxy users rejoice!

After my first order and application of this product I immediately ordered 5 more!!! This stuff is fenominal for glass work with epoxy and the only product that is available with powder coating! Yes it is messy and you will get strands everywhere but if you just score or tare it slowly it holds together fine. Also I have to say if you need to get 90% or just tuck it under it will comply! Just keep dab dab dabbing until the epoxy kicks and you will be just as satisfied as I am!

22.07.2023

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