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BOPP Explained: What Biaxially Oriented Polypropylene Film Is, How It’s Made, and Where It’s Used
(Updated July 2026). Biaxially oriented polypropylene is polypropylene film that’s been stretched in two directions during manufacturing, and most people just call it by its acronym: BOPP. If you asked any of our packaging engineers to name the film wrapping…
Choosing the Right PET Film Thickness: Gauge, Mil, and Micron Explained
Quick Specs Common Units Gauge, mil, micron (100 gauge = 1 mil = 25.4 micron) Label / Release-Liner Band 23-36 micron PET Density 1.33 g/cm³ (amorphous) to 1.38-1.40 g/cm³ (biaxially oriented) Measurement Standard ASTM D6988 (lab test method, not a…
Chemical Resistant Labels: How to Choose the Right Material and Adhesive System
Chemical resistant labels are pressure-sensitive label constructions engineered so the facestock, adhesive, topcoat, and print method survive a specific chemical exposure together as one system, rather than a single “resistant” material working alone. Quick Specs Common facestock families PET (polyester),…
PET vs BOPP Film for Labels: Which One Actually Wins?
Quick Specs: PET vs BOPP at a Glance Density BOPP ~0.90-0.91 g/cm³ | PET ~1.38-1.39 g/cm³ Tensile modulus BOPET (PET film) roughly 2x BOPP’s modulus — PET is the stiffer film, not BOPP Continuous-use temperature BOPP ~100-110°C | PET ~150-175°C…
Self-Adhesive Film for Labels: A Complete Materials Guide
Reviewed by the Guanma technical team · Updated July 2026. Quick Specs: Self-Adhesive Label Film Construction Facestock + pressure-sensitive adhesive + release liner (3 layers) Facestock polymers PET, BOPP/PP, PE, PVC (+ synthetic paper) Thickness range 12 µm (thin PET)…
CCK Release Paper Explained: How Clay-Coated Kraft Liners Work — and How to Spec Them
![CCK Release Paper: Clay-Coated Kraft Liner Guide [2026]](https://guanmalabel.com/wp-content/uploads/2026/07/cck-release-paper-featured-768x512.png)
Updated July 2026 · A materials-side guide for plant engineers, converters, and procurement. CCK release paper is a clay-coated kraft release liner: a kraft-paper base sealed on one side with a fine clay (kaolin) layer and then a silicone coating,…
Glassine Release Liner: How It Works & How to Choose (2026)
A glassine release liner is the smooth, semi-translucent carrier that holds a pressure-sensitive label or tape until the moment you peel it off. It looks like a humble backing sheet, yet the choice between glassine and the alternatives decides whether…
What Is Thermal Paper? How It Works, Types & Safety (2026)
Thermal paper is a type of paper used in certain types of printers that turns black in response to high temperatures rather than using ink. It is used in the majority of tills, vending machine labels, and the tickets you…
Label Solutions by Application: A Material Selection Guide
Choose Label Solutions by Application. It’s 3 ingredients- facestock, adhesive and release liner- that must meet the unique surface, environment, press and regulatory demands of your product. When it’s the perfect fit, it will hold to a freezer, a chemical…
What Is a Release Liner? Types, Silicone Coatings & Uses
What is a release liner? At its most basic, a release liner is a silicone-coated backing sheet that carries pressure-sensitive adhesive and keeps it from adhering to anything until use. You probably touch a release liner nearly every day –…
