Tightly Woven Fiberglass Cloth Styles for Composites - Fiberglass Cloth Supply and Education

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Tightly Woven Fiberglass Cloth Styles for Composites

Other Specifics
There are several parameters of what we at Thayercraft consider to be tight weaves.  One is they are all plain weaves.  Many satin weave styles of fiberglass cloth are tight weaves that have a high thread count but not what we refer to as tight weaves. Therefore all the fiberglass cloth weaves in this category will be plain weaves that pass a certain threshhold of thread count for it's relative weight.   A fiberglass cloth style's weight, or ounces per square yard, that is small, for example, the style 104 with a weight of 0.56 oz/sq yd that has a thread count of 60 x 52 ends/inch is not what we consider to be a tight weave because of it's lower weight value.  We have developed our own terminology for this relative relationship which we have named the
Tight Factor that is a ratio of the average thread count to the ounces in the oz/sq yd.  This can be applied to all weaves as well as S glass as well but for the styles in this section will only include E-Glass plain weave fiberglass cloth styles.  An example of a tight factor would be for style 3070, which has a thread count of 70 x 70 ends/inch and a weight of 2.74 oz/sq yd. The factor for style 3070 would be 26 which is derived by dividing the average of the warp yarn thread count of 70 and the average of the fill yarn thread count which is also 70 by the weight which is 2.74 oz/sq yd.  For comparison one could calculate the Tight factor of a loose weave like style 4700 which has thread count of 14 x 14 ends/inch and weighs 4.6 oz. with a Tight Factor of just 3.  Further understanding of the Tight Factor could be achieved with looking at boat and tooling fiberglass cloth weaves like styles 3733 and 7500 that would have tight factors of 3.1(18/5.8),  and 1.6 (15/9.6) relatively.  Tight Factor consideration are only useful in comparing styles in a particular weight range and not relavent more broadly.  For example you would use this comparing fiberglass cloth styles that have the same weight like 3733 and 7628, 6 oz/sq yd, with a tight factor of 3.1 for 3733 to 7628's Tight Factor of 6.3 (38/6).  Another example would
be fiberglass cloth styles 1165 versus style 1522 that are both approximately 3.7 oz/sq yd.  Style 1165 would have a Tight Factor of 15 (56/3.7) and style 1522 would have a Tight Factor of just 6.2 (23/3.7).  We will have the Tight Factor values included in the data for each of the Tight Weave styles on this page but one can make comparisons on their own by simply taking the average thread count of any style of fiberglass cloth and dividing by the style's weight.  Other parameters limiting styles included in the Tight Weave category is addition to being plain weaves they are more balanced and do not go beyond a warp yarn  to fill yarn ratio of 1.5 to 1. In other words, unidirectional weaves will also be excluded from this category and just more balanced weaves will be listed. This category is also limited to tight weave fiberglass cloth styles that are finished for resin.  There are many tight weaves used in industry where the companies purchasing these weaves generally have a full understanding of the weight and construction of the cloth they are getting.  Only cloth that's finished with for resins such as epoxy, polyester, vinyl ester are in this category.  Cloth in the greige, heat cleaned, water washed, or otherwise not suitable for resins will not be included here.  This is all kind of lengthy with the gist of being just to better help you select the proper fiberglass cloth for your project.  Here are the styles of fiberglass cloth weaves we consider to be tight weaves


2313  3070  1165 1652, 1500, 2157,














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