astronomer1

How do you determine what weight Fiberglass Mat that one has? Other than reading the label which only states in my case it's use, other information about the material I have is lacking. It is woven material like cloth and not "woven rovings".

I assume (dangerous thing), that 1oz is lighter than 2oz. Is this the weight per sq. foot? That being the case, I suppose I could weigh a 10 sq. inch chunk and multiply the weight by 14.4 to get the weight per sq. foot.

The lightbulb just lit. I think I have answered my own question. Forgive me! Sometimes I have to talk to myself to get an answer to a question that I have. Big problem is the back talk that I get when I do this!

LesUyeda

Not at all unusual. Asking the question of someone else forces you to clearly define the question.

Les

jaka

Hi!
Fiberglass mat should not be used in modeleing! It's heavy and not that stong compared to weave!

astronomer1

My reference to Fiberglass Mat should have said Woven or Cloth type fiberglass.

Weighing a 4" x 5" (20 sq. inches) piece resulted in 2 grams or roughly .07oz.
20 sq in is about 1/7th of a sq. ft. Therefore, 7 x .07oz.= .49oz/ sq. ft. or
rounded off = .5oz. or 1/2 oz. per square foot.

Is this how the fiberglass cloth is rated or specified. Weight per Sq. foot? Will one layer of this work for reinforcing a foam wings epoxied joints on a 1/2A plane. (ACE Whizard)

Ed Smith

Generaly,

Cloth weight is quoted in ozs/sq yd

Mat is quoted in ozs/sq ft

Ed s

huck1199

I usaully use 3/4 oz for glassing.  I recall that this is what most suppliers carry.  They also carry heavier cloth as well but the light stuff is what most people use.