What Is The Difference Between GSM Tester & Quadrant Scale?

 Both grammage tester and quadrant scale are significantly used in the paper industry for similar purposes, which is why many of us confuse their functionality. However, the purpose of using these testers is not exactly the same. They are used for measuring different aspects of the quality of the paper. In simple words, the GSM tester is used to measure the basis weight of the paper, while the scale measures the thickness or calliper of the paper. 


There are other differences, too, between the two measuring equipment. We will throw light on these differences in the following section. So, keep reading. 


What is a Grammage Tester?

A grammage tester is an intelligently designed instrument that measures the basis weight or weight per unit area of the paper. In simple words, when a specific area of paper sample, prepared using a square paper cutter is tested on the GSM tester, it determines the weight or the density of the sample. 


The basis weight is expressed in terms of grams per square metre, and the sample of a particular area is either prepared using a square paper cutter or a circular sample cutter. The grammage or basis weight of the paper affects many physical properties such as strength, durability, texture, opacity, and its performance in printing applications. Due to this reason, this measure is used in the quality control applications. 


What is a Quadrant Scale?

The quadrant scale is one of the traditional instruments used to measure the thickness or calliper of the paper. It doesn’t concern the weight or the density of the paper but its calliper, which is why it finds application in determining the suitability of the paper for certain printing techniques. 


The quadrant scale is typically a micrometer which has a scale. On this instrument, the sample is placed on a platform or between two arms, and the distance between these points is measured by the scale. While measuring the paper thickness or calliper, the paper is slightly compressed for accurate results. 


The thickness of the paper is expressed in terms of mil or microns. It must be noted that the calliper is an important consideration when measuring the opacity, bulk, and receptive properties of the paper. Based on the measurement, the paper is sent for different applications, that is, a thicker paper for packaging and similar purposes, while a thinner paper for printing or writing paper. 


What is the difference between these testers?

Looking at the above definitions and functionalities of the instruments, it is clear that a grammage tester measures the weight or density of the paper, while a quadrant scale measures the thickness or the calliper of the paper. A GSM tester finds application when the basis weight of the paper is crucial, while the scale is used when the bulk or thickness of the paper is important. Although both instruments are used to determine the paper’s quality, they emphasise different properties.  


Wrapping Up

If you are looking to invest in these instruments and achieve accurate measurement of properties. Reach out to UEC, a leading manufacturer of GSM tester and quadrant scale. Visit the website to learn more and send inquiries.


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