GSM vs. PT unit system in packaging material, A guide

Both GSM and PT. unit system falls under the category of measuring thicknesses of packaging material; hence they’re the determinants of quality of paper that is being used as a wrapping material. In addition to this, they measure the packaging thickness and this is done be assessing traits such a weight, thickness and durability of the material. This, in turn, will aid in selecting the precise type of paper required for packaging. You can also get help from experts for the accurate thickness of your product packaging paper from the The packaging material used could be of wide ranges including cardboard, paperboards, corrugated sheets etc.

  • Contrast between GSM. And PT unit

GSM or grams per square meter-grammage of paper- refers to how much one square meter of paper weighs. For instance, 75 gsm means 1m2 of this paper weighs 75 grams. Hence, in mathematical terms,

1gsm= 1g / 1 m2

Moreover, gsm and thickness of paper are inversely proportional to each other, which expressed mathematically is:

Gsm ∝ thickness

This means the thicker the paper, the higher the gsm value and vice versa. Moreover, the gsm doesn’t necessarily represent thickness of the paper used but also determines how much material should be used in the packaging.  

PT. or point system is a system that is used to measure thickness of a paper. The main difference between pt. and gsm is that pt. is measured using calipers / micrometer that measures in thousandth of an inch. For instance, paper measuring 0.009 inches in thickness can also be interpreted as 9-point media.

  • Verification

There are various international accreditations which aid in evaluating the criteria of papers. They should be chosen to get desired printing and packaging quality. However, the verification really depends on the budget of the company and how much it us willing to invest in it.

  • Similarities

Both the systems are used for determining the quality of material used in packaging. The allow the buyers in knowing quality of paper and hence choose in accordance to their requirements. This ‘judgement’ is mostly dependent upon the application of the paper that will be used by the company.

  • Conversion of GSM. to PT.

Various types of papers including coated, uncoated, pulp etc. affects the conversion of gsm to pt. system. In short, weight of paper and the finishes it comes in contributes to the conversion.

For packaging, 14 pt.+ papers usually start with 310 gsm, since, these are thick enough to be used in coverings. In order to decipher the trend, following conversions can also be considered:

  • 14pt = 270 gsm
  • 16pt = 350gsm
  • 18pt = 400gsm
  • 24pt = 460gsm
  • 40pt = 600gsm
  • Importance in printing/ packaging

Significance of these measuring systems lies in the fact that they ensure the quality of products is maintained throughout. Since, gsm of a material is essential in calculating the strength it possesses, it aids in deciding whether the product is free from defects or not. Furthermore, Gsm plays a vital role in figuring this out as the thicker the packaging material, the greater is the surety of product wrapped inside being secure from external factors.

Various degrees of gsm. are used for various purposes; this is done because the thickness of paper decides its usage. Papers with gsm. value of 300-400 gsm. and above are mostly used in fragile it is.

In packaging, there are two ways of designing information regarding the package and brand. Either all the details are printed on the sheet that is to be used in packaging or these details are written upon the materials chosen. In the latter, it should be taken into the account the absorbency/ saturation power of the paper and the ink used in designing. This holds immense importance as it might result in dimming pf the design once printed on the paper.

King Custom Boxes could take into account the product that is to be packaged and the kind of packaging it would require. This is because the quality of material used also affects the price that’s they are to be sold at and hence affect the sales directly. For instance, fragile materials require thick packaging while the products who are robust wouldn’t require much thickness and hence should be managed accordingly.

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