GSM vs. PT Unit Systems: What's the Difference?
What are the key differences between GSM and PT units?
Why is the GSM Unit System so important?
Understanding Common GSM paper Measurements
Conversion between the GSM/PT Unit System
How to compare paper weights and thicknesses
The Implications of Packaging
Package thickness is a key aspect of packaging.
The thickness and appeal of your packaging can impact its durability, protection, and aesthetic appeal.
You can design packaging that is effective for your product by understanding the thickness of the package and other factors.
We will discuss key terms that describe the thickness of packaging, unit systems, weight conversions, and how they impact your overall packaging.
Let's start with the basics. The most common terms for packaging thickness are PT or GSM.
GSM vs.PT are two terms used to measure packaging thickness and determine the amount of material stock required to make packaging that is tailored to your products' requirements.
A third measurement is a weight in pounds or lb of the paper.
Before it is cut, it is measured using one ream (i.e., 500 sheets).
These are the units that are used to determine packaging thickness.
Let's now examine each one in detail to distinguish between GSM and PT.
As we have discussed, points are used to show the thickness of a sheet or package of corrugated paper.
Each point represents 1/1000th inch.
You'll notice that most packaging options use the point system to describe thickness. For example, 8 pt can be used to describe thickness. 16 pt can be used.
You can use the measurement to determine the thickness of the stock and get a better idea about the protection it offers.
The thicker the PT, the higher.
Grams per square meter (GSM) is the metric equivalent to the point system, using centimetres or meters for its prime measurement.
It can be confusing because there is no simple way to convert measurements between systems.
GSM considers weight, length, breadth, and width rather than height and thickness.
Be aware that packaging materials can appear thicker than they are.
Corrugated fiberboard can feel thicker than corrugated cardboard, but it won’t necessarily be heavier.
The GSM unit will determine how thick or heavy the paper is with GSM.
High-quality paper generally has a higher GSM because it is more durable and prints better.
 Why is the GSM Unit System important?
GSM is essential because it is the most widely used, and it is easier to communicate with vendors via this system.
GSM is more important than its simplicity because it transmits more information.
It also considers weight, which is important when considering packaging and cost.
It is also a more exact measurement of packaging thickness. This allows you to make more informed choices, simplify the design process, and add less confusion to your packaging journey.
What are some common measures you might see when looking at GSM?
 Understanding the Common GSM Paper Measurements
You can make informed decisions by understanding common GSM paper sizes.
You can decide the thickness and weight of your packaging based on its appearance and durability.
35-55gsm: This paper is used for printing most newspapers.
90-100gsm: This paper is for normal printer/copier use. Premium paper, like bond papers, would cost between 110 and 120gsm.
120gsm - 140gsm Posters and flyers are printed on this paper as they are stronger and can withstand wear and tear.
210-300gsm: You've probably seen glossy brochures and know how this paper feels.
350-400gsm: Mainly used for packaging and business cards
Once you have a clear idea of the GSM you are looking for, you can switch between it or the point system as needed. Here's how.
 Conversion between the GSM/PT Unit System
GSM can be used to calculate thickness because it is essentially the metric version of the PT system. GSM does not consider weight, so they cannot be used interchangeably.
These conversion charts can be used to switch between them when you are thinking about paper thickness (pt vs. gram) and what you require.
It is helpful to have accurate conversions depending on your packaging vendor.
 Thickness/Packaging Material
16 point C2S/ Solid Bleached Sulfate (16SBS)*
24 point C2S/ Solid Bleached Sulfate*
As you can see, thickness doesn't always translate into weight. The 17-point uncoated surface packaging material is 350gsm. However, the thicker 18-point brown Kraft is only 315gsm.
 Other than paper, other packaging materials are available, including corrugated board (a variety of types such as the single face, double wall, and triple wall-all with different gsm).
 We have a better understanding of the conversion process. Let's look at comparisons between paper thickness and paper weight.
 How to compare paper weights and thicknesses
Although it can be difficult to distinguish between US and metric systems, the most important thing is that the GSM system measures weight for paper.
It is important to know the weight and thickness of your packaging material to measure cardboard and corrugated paper thickness.
You can use the thickness and weight to help choose the right packaging for your customers. It will provide a great unboxing experience and be durable enough to withstand long shipping and transit.
To better understand the pros and disadvantages of different thicknesses and how they will impact your shipping and packaging material costs, you can consult packaging experts.
Let's now see what these various measurements mean for packaging.
 Packaging: The Implications
Now that you know the various ways of measuring weight and thickness in packaging, how can you incorporate this information into your packaging materials?
It is important to distinguish between packaging materials in the design process. Also, it is important to look objectively at materials.
You can use the paper thickness pt and gsm to determine the best packaging option for your product. This will ensure that it arrives intact at customers.
Another important measure is to get an idea about the final packaging product's appearance and feel.
Do you prefer it to feel heavy and thick when it arrives?
Are there logos or images printed on the packaging? A higher GSM might be required to print images of high quality because of the texture of the packaging.
 we would help if you also decided on the finish of your packaging. Do you prefer a matte or glossy look? It all depends on the GSM of the packaging material.
The GSM unit system allows you to communicate with designers and create packaging experiences that are authentic to your brand.
Talk to a packaging expert if you are unsure what works and does not.
They will help you understand the GSM system and advise you on how to choose your packaging thickness for a consistent customer experience.
