{"id":7721,"date":"2026-11-09T01:43:52","date_gmt":"2026-11-09T01:43:52","guid":{"rendered":"https:\/\/www.heyipackage.com\/?p=7721"},"modified":"2026-11-09T01:43:52","modified_gmt":"2026-11-09T01:43:52","slug":"coffee-bag-thickness-microns-mils","status":"publish","type":"post","link":"https:\/\/www.heyipackage.com\/ja\/coffee-bag-thickness-microns-mils\/","title":{"rendered":"Coffee Bag Thickness: How to Compare Microns, Mils and Single-Wall Specs"},"content":{"rendered":"

Compare coffee bag thickness only after confirming the unit, whether the figure describes one wall, and whether it refers to the complete laminate.<\/strong> A quotation saying \u201c4 mil\u201d cannot be compared directly with one saying \u201c100 microns\u201d until those definitions match. Thickness is a specification to check, not a shortcut for choosing the best bag.<\/p>\n

For a roaster ordering from more than one supplier, this small clarification can prevent a sample approved under one interpretation from being ordered under another.<\/p>\n

Microns and mils are different units<\/h2>\n

A micron is a micrometre, written as \u00b5m. A mil is one-thousandth of an inch; it is not a millimetre. NIST Handbook 133, 2026, Appendix E<\/a> gives the exact conversion: 1 mil = 0.001 inch = 0.0254 millimetre = 25.4 micrometres<\/strong>.<\/p>\n

Use micrometres = mils \u00d7 25.4. To convert in the other direction, divide micrometres by 25.4.<\/p>\n\n\n\n\n\n\n\n\n
Thickness in mils<\/th>\nEquivalent in micrometres<\/th>\nEquivalent in millimetres<\/th>\n<\/tr>\n<\/thead>\n
2 mil<\/td>\n50.8 \u00b5m<\/td>\n0.0508 mm<\/td>\n<\/tr>\n
3 mil<\/td>\n76.2 \u00b5m<\/td>\n0.0762 mm<\/td>\n<\/tr>\n
4 mil<\/td>\n101.6 \u00b5m<\/td>\n0.1016 mm<\/td>\n<\/tr>\n
5 mil<\/td>\n127.0 \u00b5m<\/td>\n0.1270 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

These are calculated unit equivalents, not HEYI product specifications or recommended coffee bag thicknesses. For example, 100 \u00b5m is approximately 3.94 mil. Whether it is acceptable against a nominal 4-mil specification depends on the agreed tolerance and measurement basis.<\/p>\n

Ask whether the number describes one wall<\/h2>\n

Have the supplier state \u201csingle-wall thickness of the finished laminate\u201d if that is what the purchasing specification requires. A measurement taken through both faces of a flattened bag answers a different question.<\/p>\n

As a simplified arithmetic example, two flat walls measuring 100 \u00b5m each add up to 200 \u00b5m. That does not make either wall a 200-\u00b5m laminate. Avoid treating measurements across a zipper, seal or folded gusset as interchangeable with a flat-panel reading. Specify where the measurement should be taken and ask the supplier how its reported figure was obtained.<\/p>\n

Separate overall thickness from the layer description<\/h2>\n

A total thickness number does not tell you what every layer is made from. Ask for the proposed material structure alongside the overall nominal thickness. If the quotation lists individual layer thicknesses, clarify how the finished laminate total is defined and whether coatings or adhesives are included.<\/p>\n

Do not assume two equal-thickness bags have equivalent protection or processing behaviour. Request evidence for the performance your project needs separately, rather than asking a thickness figure to stand in for a complete material specification.<\/p>\n

Our coffee packaging buyer\u2019s guide<\/a> discusses material and bag-format choices more broadly. This thickness check belongs alongside that selection process.<\/p>\n

Agree the measurement method and tolerance<\/h2>\n

ISO 4593:1993<\/a> addresses thickness measurement of plastic film and sheeting by mechanical scanning. ISO lists it as confirmed in 2025; its public abstract excludes embossed film and sheeting. A buyer should therefore ask whether the proposed method fits the actual material and surface, rather than requesting a standard number without checking its scope.<\/p>\n

Nominal thickness and measured results should be labelled separately. Ask how many measurements are taken, where samples come from and how variation is reported. Agree the acceptance tolerance in writing before placing the order. This article does not prescribe a universal tolerance or claim that HEYI has tested a particular structure to this method.<\/p>\n

A compact thickness specification for your purchase order<\/h2>\n