How to Convert PP / HDPE Microns to GSM





About Microns and Grams per Square Meter (gsm)

The micron is a standard measurement of length in the metric system that’s the equivalent of one-millionth of a meter.

Gsm stands for “grams per square meter.” When used in the context of measuring the weight of PP sheet or any material it is also referred to as “grammage.” It is the equivalent of 0.001 kilograms per square meter.

The challenge is that there’s no real direct one-to-one correlation between microns and gsm. That’s because microns measure the thickness of PP sheet or any material, while grams per square meter measures the weight of PP sheet or any material.

For an example, two people can each weigh 150 KG, but not be the same at all. If one person is 5’11” tall, and the other is 5’2”, there will be a significant difference between the two physical bodies in space.

However, you can convert microns to gsm with a few tools and a simple calculation.

What You’ll Need

In order to calculate both microns and grams per square meter, you’ll need the following tools:

·        Thickness Gauge

·        Gram scale



Convert Microns to Gsm

To convert microns to grammage or grams per square meter, measure the mass and the volume of a large stack of the PP sheet or any material with which you’re working. These measurements should be calculated in grams and centimeters cubed, respectively.

To find the volume, multiply the width and height from the label of the PP sheet or any material packaging by the thickness of the stack of PP sheet or any material. Measure the thickness yourself with the measuring tape or micrometer.

Lets take an example, suppose we have a 100 microns PP sheet, so to calculate the GSM we should know the density and volume. 

here we have to calculate GSM, it means 

L = 1 meter

B = 1 meter

H = 40 micron

then, volume    = L X B X H

                        = 1 X 1 X 40 X 10-6

(Since, 1 meter = 106 microns)

                        = 40 X 10-6 meter cube.

Now,     MASS = Density X Volume

Density of PP is 910 kg per meter cube

So,   MASS    = 910 X 40 X 10-6 KG

                      = 0.0364 kG

Since, here in this case mass in gram will be equal to GSM, as we have already taken L & B 1 meter.

so, GSM = MASS in kg X 1000 (1 kg = 1000 gram)

therfore, in our example GSM = 0.0364 X 1000

                                                = 36.4 gram per square meter.

Comment your Calculation with example.

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