Fabric weight depends mostly on the SWL and SF of the big bag.
Usually the customer does not have to decide which fabric strength the FIBC must have as this is decided by Albel sales agents according to the SWL and SF and the respective certificates.
However, a customer can always order an upgrade on fabric weight to get a stronger big bag.
Higher fabric weight (gsm) will lead to less bulging of the full big bag and make it more resistant against physical damages. Standard cloth weights are 165, 180 and 200g/m2.
Big Bag fabric can be coated or uncoated. The coating is an additional polypropylene layer of 18-30 gr/m2.
This makes the fabric waterproof so no moisture can get through the fabric and leakage of fine materials from the FIBC is prevented.
Coated big bags usually also have dustproof sewing to seal the seams of the big bag.
An additional advantage of coating is that it “glues” the fabric together so no loose threads will fall off and cause contamination.
The disadvantage of coating is slightly higher cost and reducing the air permeability for organic products.
The most common colour for FIBC is white with a market share of almost 95%.
We are able to produce big bags in any colour, however, this is only economical for big orders.
No matter which colour the cloth has, it can be printed accordingly.
There are four approved options in the measurement of fabric mass per unit area:
Option A, Option B, Option C, and Option D. Option A may be used for acceptance testing of commercial shipments since it has been used extensively in the trade. The second option is Option B which is applicable to a full-width sample cut from a full piece, roll, bolt, or cut. Unless otherwise specified, these results will include selvages and will be on the basis of conditioned fabric. Option C on the other hand is applicable when a small swatch of fabric is sent to the laboratory to be used as the test specimen. The results are considered to be applicable to the sample only and not necessarily to the lot from which the sample was taken.
Measurements by this method do not include selvages and should be reported as such, unless a selvage allowance is specified. The last option is Option D which is intended for use with narrow fabrics as so designated by the trade. This abstract is a brief summary of the referenced ASTM standard. It is informational only and not an official part of the standard.
These test methods cover the measurement of fabric mass per unit area (weight) and is applicable to most fabrics.
There are four approved options:
1.Option A—Full Piece, Roll, Bolt or Cut
2. Option B—Full Width Sample
3. Option C—Small Swatch of Fabric
4. Option D—Narrow Fabrics