Double Bias?

[idkfa]

Double Bias Carbon
45W27-6k +45/-45 15 osy, 12K 90 12 osy, 27 osy

This seems a lot more than double bias, can anyone decipher, thks.

[Craig_Hastie]

Perhaps you should ask these people, as they appear to have it as a carbon product.

sales@compositesspecialists

[marshmat]

I hate it when manufacturers do this.... drove me nuts back when I was working with the stuff, trying to translate from one supplier's notation to another's, or to an actual description of the material.

I'll try to interpret, but don't take this as for sure, because some manufacturers mix things up in weird ways:
45W27 - this is probably the product number, ie. the number you use to order it.
6k +45/-45 15 osy - this describes a 15 ounce per square yard biaxial, fibres running at +45/-45 degrees to the warp axis, made with roughly 6000 filaments per tow.
12k 90 12 osy, 27 osy - this appears to describe a layer of 12 and/or 27 ounce, 12k tow count fibre running perpendicular to the warp axis.

But, as I said, don't quote me on that. Check with the actual supplier.

[Eric Sponberg]

Marshmat is pretty much correct in his interpretation of the specifications. The construction is a weft Triaxial of 27 ounces per square yard, not a double bias fabric. The +/-45, 6K fibers are the biaxial part at 15 ounces per square yard, and the 90-deg, 12K fibers are weft part at 12 ounces per square yard. The total weight of the fabric is 15 + 12 = 27 ounces per square yard.

The 45W27, therefore, refers to the fact that it is a "+/-45 weft triaxial fabric at 27 ounces per square yard." I don't know who makes this fabric, but as Marshmat says, get back to your supplier for confirmation. If you are looking for a double biax fabric, you'll need a different one than this.

I hope that helps.

Eric