Art card is one option for packaging boxes, but there is no single answer to whether you should use 250, 300, 350 or 400 GSM for every product. Consider the box dimensions, product weight, structure and actual paper characteristics together, rather than using GSM as the only criterion.
GSM measures weight per area, not thickness directly
GSM, or g/m², means the weight of one square metre of paper. For example, 300 GSM means one square metre weighs approximately 300 grams; it does not mean 300 microns thick. Papers from different grades or manufacturers may differ in thickness and stiffness despite the same GSM.
Actual thickness is measured in millimetres or microns. Stiffness and shape retention also relate to the paper composition and grain direction. When comparing materials, ask for the grade, manufacturer and physical samples.
How to compare the 250–400 GSM range
| Range to compare | What to inspect in a sample |
|---|---|
| 250–300 GSM | Shape retention, panel dimensions and the weight of the contents. |
| 350–400 GSM | Thickness at flaps and base, folding, assembly and product fit. |
This table is a sample-checking guide, not a load rating or a rule assigning a GSM to a product. Increasing GSM within the same grade may make a box feel firmer, but test the actual box design intended for production.
Four factors to discuss with your printer
Product weight and shape
Glass jars, plastic bottles and flat products place loads differently. Include the weight of closures and accessories. If the product moves inside, an insert may be more appropriate than increasing GSM alone.
Panel dimensions and box structure
Larger boxes have larger panels, so check bowing and compression where loads are applied, together with the base closure and glue areas. Read more about preparing a cosmetic box printing order.
Paper surface and printing requirements
Check whiteness, surface, the side to be printed and colour samples on your chosen paper. A screen image or another paper type cannot fully substitute for viewing colour on the actual material. Use the same specifications when comparing prices.
Folding and decorative finishes
Paper and coatings affect fold lines. Inspect a formed sample, especially in dark-coloured areas. Assess foil and embossing on the intended material and positions rather than deciding from a mockup alone.
Which samples help you decide?
Start with paper swatches to compare surface and stiffness, followed by an unprinted box made to the actual dimensions and structure to test the product fit. If colour or coating must be approved, agree on the appropriate proof or sample separately, since each serves a different purpose.
Frequently asked questions
Is 400 GSM always stronger than 300 GSM?
Do not draw this conclusion across different paper types. A suitable structure and correct product fit also matter. Compare samples under the same conditions.
Does coating make a box waterproof?
Some coatings protect the surface, but they do not automatically waterproof cut edges, fold lines or the whole box. Explain moisture exposure and test before production.
Ask about materials for your box
Prepare box dimensions, product weight, quantity and conditions of use, then contact Phunporn Printing or call 096-329-5356. See what to provide for a quotation to compare specifications clearly.
