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What is the density of PETG shrink film?

2025-07-14

Τελευταίες εταιρικές ειδήσεις για What is the density of PETG shrink film?

The density of PETG (Polyethylene Terephthalate Glycol) shrink film generally falls within a range of 1.28 g/cm³ to 1.33 g/cm³.

Here's a more detailed breakdown:

  • Most Common Density: Many manufacturers and product specifications cite a typical density of 1.32 g/cm³ for PETG shrink film. This is the value you'll most frequently encounter.

  • Slightly Lower End: You might also see densities around 1.28 g/cm³ for certain PETG shrink film products. These slight variations can depend on the specific formulation, additives used, and the manufacturing process.

Why is density important for PETG shrink film?

  1. Recycling: Density plays a critical role in the recycling of plastic bottles, especially PET bottles with shrink labels. PET has a density around 1.35 g/cm³. If a shrink label (like most PETG films) also has a density greater than water (around 1.0 g/cm³) and is not easily separable from the PET bottle, it can contaminate the PET recycling stream. This is why some efforts are made to develop "floatable" labels (with densities less than 1.0 g/cm³) for better recycling, though these are typically not standard PETG shrink films.

  2. Material Properties: Density is intrinsically linked to other mechanical and physical properties of the film. Generally, higher density can indicate greater strength, stiffness, and barrier properties.

  3. Cost and Weight: The density affects the weight per unit area of the film. This has implications for material costs, shipping expenses, and the overall weight of the packaged product.

Factors that can subtly influence PETG film density (and overall properties):

  • Polymer Composition: The specific ratio of monomers and any added co-polymers or additives can slightly alter the final density.

  • Processing Conditions: The temperature, stretching ratios (machine direction and transverse direction), and cooling rates during film extrusion and orientation can impact the molecular packing and, consequently, the density.

  • Crystallinity: While PETG is an amorphous (non-crystalline) polyester, variations in processing can still influence the degree of order in the polymer chains, which can affect density.

  • Fillers or Additives: If any fillers or performance-enhancing additives are incorporated into the film, they can also modify the density.

In summary, for most practical purposes, assume the density of PETG shrink film is around 1.32 g/cm³, with some variations existing in the 1.28 g/cm³ to 1.33 g/cm³ range depending on the specific product and manufacturer.

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