Fabric GSM Measurement Procedure
GSM means grams per square metre. It tells us how much one square metre of fabric weighs and is widely used in fabric inspection, development and production control. A reliable result depends on accurate sample cutting, a calibrated balance and proper sample conditioning.
Equipment required
- GSM sample cutter of known cutting area
- Digital weighing balance with suitable resolution
- Flat cutting surface and sample identification labels
- Conditioning facility where required by the test method
Test procedure
- Take representative samples from the fabric roll, avoiding damaged or distorted areas.
- Condition the samples according to the applicable test method.
- Cut the specimen using a GSM cutter of known area.
- Place the specimen on the balance and record its weight.
- Repeat the test at the required number of positions and calculate the average.
Calculation
If the cutter area is 100 cm², the conversion factor is 100. Therefore:
GSM = specimen weight in grams × 100
For example, a 100 cm² specimen weighing 1.80 g gives 180 GSM. Always use the actual cutter area and the correct conversion factor for your equipment.
FAQs
Why test more than one specimen? Fabric weight can vary across the width and length.
Can a normal scissors-cut sample be used? It can introduce area errors; use a suitable cutter or accurately measured specimen.
Does GSM alone determine fabric quality? No. Construction, composition, strength, dimensional stability and other properties also matter.
0 Comments