Coated Paper Grammage 80g vs 100g vs 120g vs 157g: Stiffness / Ink Absorption / Die-Cut Differences Across 4 Grades — Before the Client Says "Switch to a Cheaper One"

In mid-2025, a print shop in Wuxi handling cosmetics color boxes received an email from a client (a rising domestic beauty brand): "If we drop the color box grammage from 350g to 300g, will the stiffness suffer?" The boss replied: "300g is still enough, and it's RMB 0.8 per piece cheaper." The client pressed: "What about dropping further to 250g?" The boss hesitated.

This kind of back-and-forth has been frequent in 2024-2025. Rising brands push grammage down to control cost, but print shops can't clearly explain how far they can push without harming quality. This article lays out the real differences across the 4 low-grammage coated papers: 80g / 100g / 120g / 157g.

How Coated Paper Grammage Is Tiered

Coated paper grammage spans a wide range from 80g to 400g, mainly divided into 5 tiers:

• 80-105 g: Thin coated paper, mainly used for instruction manual inner pages, hangtags, and stickers. Low grammage, poor stiffness, cannot form box shapes.
• 120-157 g: Medium coated paper, mainly used for color box surface paper, pasted box surface paper, and gift box inner pages. Medium grammage, suitable for box shapes after lamination.
• 200-250 g: Thick coated paper, mainly used for color box surface paper (single layer). Sufficient stiffness, can form simple boxes.
• 300-350 g: Card coated paper, mainly used for premium color boxes and gift box outer shells. Good stiffness, suitable for direct box forming.
• Above 400g: Ultra-high grammage, mainly used for hardcover box covers and corrugated lamination. Excellent stiffness, but high cost.

This article focuses on the 4 low-grammage coated papers of 80 / 100 / 120 / 157g, since these are the 4 most commonly used for color box surface lamination, instruction manual inner pages, hangtags, and stickers.

Real Differences Across 4 Grammages: Stiffness / Ink Absorption / Die-Cut / Lamination

The data below comes from testing by mainstream domestic coated paper suppliers (Chenming, Sun, Jinhai, Huatai) during 2024-2025:

Several key differences emerge from the data:

• Stiffness differences: 157g MD stiffness is 10 times that of 80g. When laminating color box surface paper, 80g can barely hold the box shape and easily collapses at the waist.
• Ink absorption differences: 157g absorbs 30% less ink than 80g. This means printing the same "dark pattern" on 80g requires more ink, and the result may bleed or shift in color.
• Die-cut differences: 157g has a minimum corner radius of 1.0 mm, while 80g is 2.0 mm. If the client's design contains 1.5 mm corner radii, die-cutting on 80g will fail.
• Lamination differences: 157g's lamination peel strength is double that of 80g. After lamination, 80g boxes tend to delaminate at the folds.

3 Questions the Print Shop Should Ask Before the Client Says "Switch to a Cheaper One"

When clients request lower grammage, print shops should proactively ask 3 questions to avoid later disputes:

1. "Is your box shipped by express courier or LTL (less-than-truckload) logistics?". Express courier drop height is 1.0-1.5 m, while LTL drop height is 1.5-2.5 m. For LTL, grammage should not be below 120g; for express courier, 100g is acceptable.
2. "Does your design have any graphics with corner radii smaller than 2 mm?". If yes, grammage cannot be below 120g.
3. "How much does your product weigh, and what is the total weight after packaging?". If the packed total weight exceeds 1 kg, grammage cannot be below 157g—otherwise the box base will collapse under the load.

The Wuxi print shop boss agreed to drop to 250g without clarifying, and later when the client placed an additional 50,000-piece order, they found "box bottom collapse, client returns, RMB 180,000 loss" after packing.

Real Cost Math Across the 4 Grammages

When print shops run the numbers for clients, "per-sheet price difference" and "total cost" must be separated:

• 80g vs 157g unit price difference: RMB 1,300-1,500 per ton. For 1 million color boxes (80g per piece), total consumption is 80 tons. Switching from 157g to 80g saves 80 tons × RMB 1,500 = RMB 120,000.
• Return losses: Return rate for 80g color boxes is around 5-8%, while 157g is 1-2%. At 1 million pieces and RMB 10 per piece value, 5% returns = RMB 500,000 loss. Switching to 80g saves 120,000 but loses 500,000, a net loss of RMB 380,000.
• Lamination compensation cost: Lamination can boost 80g stiffness by 20%, but lamination costs +RMB 0.3 per piece. 1 million pieces × 0.3 = RMB 300,000, essentially eating up the material savings.

After running these numbers, the client realizes "dropping grammage from 157g to 80g" sounds like saving RMB 120,000, but actually causes a RMB 380,000 loss. This is the print shop's "persuasion tool" when running numbers for clients.

9-Dimensional Thought Summary: Should Print Shops Decide Grammage for Clients

Print shops face a boundary issue: the client wants lower grammage, the print shop advises against it, the client insists, and problems occur—who's responsible?

Answer: Whoever makes the decision bears the responsibility. If the print shop has advised against lowering grammage (with email or WeChat records on file), and the client insists (with client email confirmation), then when problems arise the client bears primary responsibility while the print shop bears secondary (20-30%). If the print shop did not advise or obtain written client confirmation, the print shop bears primary responsibility (60-80%).

Print shops are advised to handle it this way:

1. Upon receiving a client's request to lower grammage, the print shop provides a "Grammage Reduction Risk Assessment Form" (like the table in this article), sent to the client by email.
2. If the client replies "Understood, proceed with the reduction," the print shop archives the client's email.
3. If the client replies "Follow your advice and keep the grammage," the print shop proceeds as advised.
4. If the client does not reply, the print shop does not start production (waits for the client's reply).

This way, when problems arise, the print shop has a complete "advice—client decision" email chain to protect itself.

Further Reading

• 3 Hidden Costs of Grammage Deviation in Packaging Paper
• Which Paper for Gift Boxes? A Material Selection Comparison Across 4 Scenarios
• How 30% / 50% / 100% Recycled Paper Content Affects Printability
• Cost Differences When the Same Gift Box Uses Different Materials