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Paper Weight vs Thickness - What's the Difference?


Inkjet paper specs include weight, thickness, brightness, whiteness, and others to describe the physical characteristics of the media.

In this article, we will concentrate on the ways we describe the thickness and weight of inkjet photo papers.

Need some help feeding thick paper, or adjusting your printer to use thick papers? Read this article on Printer Adjustments for Thick Paper

Inkjet Paper Weight

The weight of photo paper is the description of the density of the product. While it is correlated with thickness, weight is not necessarily an indicator of how thick a paper will be. That is the reason inkjet paper suppliers publish both the weight and thickness

The inkjet paper industry uses two primary scales to measure and report the weight of paper. Bear in mind that because variations in manufacturing, actual weight can vary plus or minus 5% from the published number.

Metric Weight

The metric scale for inkjet paper weight is convenient because it is standardized and applicable around the world. It is expressed in grams per square meter (gsm). A 200gsm paper in the UK is the exact same weight as a 200gsm paper in the USA.
GSM WEIGHT EXAMPLES
120gsm - Light weight
180gsm - Medium weight
260gsm - Standard photo weight
320gsm - Heavy weight

Pound Weight

The second weight scale is expressed in pounds. This scale is familiar mainly in the USA. The main concern with the pound weight system is that there are multiple scales within this system. Some of these scales date back hundreds of years. Unfortunately, the only way to relate them is to have a chart on hand and have the knowledge of which scale is being used!

Red River Paper only uses the BOND BASIS pound weight scale. This is because everyone is familiar with a sheet of 20lb. bond paper. We arrive at a bond weight by weighing 500 sheets of 17x22 paper. That weight is the bond weight of a single sheet of paper.
BOND BASIS EXAMPLES
20lb - Copy paper
32lb - Light weight 
50lb - Medium weight 
68lb - Standard photo weight
86lb - Heavy weight


 

Paper Thickness

The thickness of inkjet paper is expressed in mil. One mil is equal to a thousandth of an inch. Because of variations in manufacturing, paper can be plus or minus 1 mil from the published number.

Epson drivers will sometimes use mm when referring to paper thickness.  The letters mm stand for millimeter.  This use of mm, when mil is the primary convention for paper thickness, is confusing.  If you need to convert mm to mil or vice versa, Google will do it via a search.  Example - Type "10mil to mm" into the search box for the answer.
THICKNESS EXAMPLES

5mil - Copy paper
8mil - Brochure paper
11mil - Photo paper
14mil - Fine Photo Paper
19mil - Cotton art paper
22mil - Canvas


 

Examples

No article would be complete without examples of the concepts taught!

26lb. ColorJet - Lightweight high quality photo matte paper
5mil / 26lb. / 105gsm

47lb. Premium Matte - Medium weight photo matte paper
8.5mil / 47lb. / 176gsm

68lb. UltraPro Satin - The best selling Red River Paper, ever!
10.4mil / 68lb. / 270gsm

Big Bend Baryta - Fine photo paper similar to wet darkroom media
12mil / 82lb. / 310gsm

Palo Duro Etching - Textured 100% cotton fine photo art paper
21mil / 84lb. / 315gsm

Blanco Matte Canvas - Cotton/poly woven canvas
21mil / 106lb. / 400gsm