GSM Calculation for Woven and Knit Fabrics

GSM Calculation for Woven and Knit Fabrics

Noor Ahmed Raaz
Specialized in Apparel Manufacturing
Owner and Editor in chief Textile Merchandising
Asst. Prof., Department of Textile Engineering
Atish Dipankar University of Science & Technology
Email: mnnabi@adust.edu.bd

 

GSM:

GSM stands for “grams per square meter”. It is a metric unit used to express the weight or density of paper, fabric, or other materials. GSM is commonly used to determine the quality and thickness of materials such as paper, cardboard, textiles, and plastics.

For example, when referring to paper, the term GSM is often used to describe the weight or thickness of the paper. Higher GSM paper is generally thicker and heavier than lower GSM paper. Similarly, in textiles, higher GSM fabrics are generally thicker, more durable, and can provide more insulation or protection.

GSM is a convenient and standardized way to compare the weight or thickness of materials, and it is widely used in many industries such as printing, packaging, and textiles.

GSM Calculation for Woven Fabric:

GSM is commonly used to determine the quality and thickness of woven fabrics. Here is the formula to calculate GSM for a woven fabric:

GSM = (Weight of fabric in grams / Area of fabric in square meters)

To calculate the weight of the fabric, you can use a weighing machine to weigh a small piece of fabric, typically 10cm x 10cm. The weight of this sample is then multiplied by 100 to get the weight per square meter.

The area of the fabric can be calculated by measuring the length and width of the fabric and multiplying them together.

Here’s an example calculation:

Suppose, you have a woven fabric with a weight of 80 grams and a length of 2 meters, and a width of 1 meter. The area of the fabric would be:

Area = Length x Width Area = 2m x 1m Area = 2 square meters

Using the formula, we can calculate the GSM of the fabric:

GSM = (Weight of fabric in grams / Area of fabric in square meters) GSM = (80 grams / 2 square meters) GSM = 40 grams per square meter

Therefore, the GSM of the fabric is 40. This means that the fabric is relatively light and may be suitable for use in applications such as summer clothing, shirts, or blouses.

GSM Calculation for Knit Fabric:

To calculate GSM (Grams per Square Meter) for a knit fabric, you will need the following information:

1. Weight of the fabric sample: You need to weigh a fabric sample to determine its weight in grams. Ensure that the sample represents the entire fabric accurately.
2. Dimensions of the fabric sample: Measure the length and width of the fabric sample in meters. Make sure to measure the fabric without any stretching or distortion.

Once you have these measurements, you can use the following formula to calculate GSM:

GSM = (Weight of fabric sample in grams) / (Area of fabric sample in square meters)

To calculate the area of the fabric sample, multiply the length and width measurements:

Area of fabric sample = (Length of fabric sample in meters) * (Width of fabric sample in meters)

Finally, divide the weight of the fabric sample by its area to obtain the GSM value.

Here’s a step-by-step example:

1. Suppose the weight of the fabric sample is 150 grams.
2. The length of the fabric sample is 1.5 meters, and the width is 1 meter.
3. Calculate the area of the fabric sample: Area = 1.5 meters * 1 meter = 1.5 square meters.
4. Calculate GSM: GSM = 150 grams / 1.5 square meters = 100 GSM.

Therefore, the GSM of the knit fabric sample is 100.