Paper GSM and Thickness: What to Specify Before Asking for a Price

“Use a thick premium paper” describes an impression, but it does not identify a repeatable specification. Two buyers may use those words for very different materials. Before comparing quotations for a brochure, card or packaging item, separate the measurable requirements from the appearance you want. A named material and a relevant sample give the discussion a clearer starting point than a weight figure on its own.

Treat grammage and thickness as separate information

GSM is the familiar purchasing abbreviation for grams per square metre, a way of expressing paper's mass per unit area. It is not itself a measurement of sheet thickness. ISO publishes separate methods for determining grammage and paper and board thickness.

When thickness matters to the item, ask for the relevant material specification rather than converting a GSM figure into an assumed thickness. Keep units visible in the quotation and drawing. If the brief is for corrugated packaging, ask the packaging team for the appropriate board specification; do not treat a general paper specification as a complete transport-box requirement.

Describe how the printed item will be used

Tell the team whether the material is for a brochure cover, inner pages, a folded leaflet, a carton or another component. Explain what the finished item needs to do: carry detailed information, present a product, be handled repeatedly or fit an agreed construction.

List the finished size, page count or pack dimensions alongside the material request. The brochure and catalogue brief should distinguish cover and inner pages where they have different requirements. A single description such as “heavy paper throughout” can leave important purchasing choices unresolved.

Request a sample that answers a specific question

Explain what you want to assess in a sample: feel, shade, surface appearance, folding, print presentation or the finished item's handling. Ask whether the sample uses the proposed material and whether its print and finishing reflect the intended job. A stock swatch and a finished product sample serve different review purposes.

If an old piece is your reference, label which qualities you want to retain. Its thickness may be useful while its colour or finish is not. Ask the supplier to identify the closest proposed specification and any differences. Keep that correspondence with the approved job record so future orders have a usable reference.

Compare quotations on the same specification

Check the material name or agreed equivalent, grammage, relevant thickness information and finishing. Ask suppliers to identify substitutions and approval requirements instead of describing all alternatives simply as “similar quality.” A clear substitution process protects the buyer's ability to review the proposed change.

Also compare quantities, artwork versions, dimensions and delivery scope. A material comparison is incomplete when one quotation uses a different finished size or excludes part of the work. For printing enquiries, keep preparation and production requirements visible beside the paper specification.

Material details to include in the enquiry

• Item type and intended use.
• Finished size, page count or approved pack drawing.
• Material reference, grammage and relevant thickness information.
• Surface, shade and finish preferences.
• The exact quality you want to assess through a sample.
• Quantity by item and artwork version.
• Rules for proposing and approving material substitutions.

If a specification is undecided, state that directly and ask for options. A thoughtful recommendation can then be assessed against the item's purpose. Copying a paper weight from an unrelated product provides precision without necessarily providing suitability.

Questions buyers ask

Does a higher GSM always mean a better finished item?

The right specification depends on the item and its intended use. Assess the proposed material, construction, print and finish together. A larger weight figure alone does not resolve those decisions or replace a relevant sample.

Can I reorder using only a previous GSM figure?

Send the earlier specification or sample as well. Ask the team to confirm the proposed material and any changes before production. A repeatable reference should include more information than a grammage number.

Send the item details and your material reference through the enquiry form. Identify which decisions need advice before the quotation is finalised.