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Quality & Testing

Tensile, Elongation, Modulus: Reading a Film's Mechanical Spec

Tensile properties relate to durability, stretch and machinability.

Direct answer

ASTM D882 measures tensile properties of thin plastic film (<1 mm): tensile strength (max stress before break), elongation (stretch), and modulus (stiffness), usually in both MD and TD. These help characterize durability, stretch and how a film will handle on machines.
Puncture and tensile film testing
Buyer diagramTechnical context for tensile, elongation, modulus: reading a film's mechanical spec.

What the test measures

ASTM D882 measures tensile properties of thin plastic film (<1 mm): tensile strength (max stress before break), elongation (stretch), and modulus (stiffness), usually in both MD and TD. These help characterize durability, stretch and how a film will handle on machines.

  • Tensile strength is terminology a buyer may see in a specification, report, or machine discussion.
  • elongation is terminology a buyer may see in a specification, report, or machine discussion.
  • modulus is terminology a buyer may see in a specification, report, or machine discussion.
  • ASTM D882 is terminology a buyer may see in a specification, report, or machine discussion.

Why a buyer might care

Tensile properties relate to durability, stretch and machinability.

The useful part is knowing which question this concept can help answer before comparing documents, requesting data, or planning a trial.

What it does not automatically tell you

A result describes the material and conditions tested. It does not by itself establish shelf life, approve a package for a product, or set a universal acceptance limit.

Boundary: This page organizes buyer and project information. It does not approve a film structure, gauge, barrier target, seal condition, food-contact position, shelf life, recyclability claim, machine setting, or supplier for a specific application.

Questions to ask

  • Which method, material, orientation, and conditions does this information apply to?
  • Is the value a typical result, a controlled specification, or an application requirement?
  • Who owns approval when the package, machine, product, or process changes?
  • What sample, report, specification, or machine record should stay with the decision?

Source and next reference

The source lineage for this page is preserved below. Use it to identify the relevant standard, OEM explanation, or trade reference; obtain the current full standard or controlled supplier document when the decision depends on it.

Related work

Written byMatt Louie
Published8/12/2026
Last reviewed8/12/2026
Review statusBuyer/procurement education; no technical certification claimed
SourcesASTM D882-18 tensile of thin sheeting (store.astm.org) ↗ASTM Subcommittee D20.19 standards list (astm.org) ↗

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