JIS K 7129

Introducing JIS K 7129 – Industrial Physics

JIS K 7129 is the Japanese Industrial Standard for determining the water vapor transmission rate (WVTR) of plastic films, sheeting, and multilayer structures using instrumental test methods. This measurement is essential for evaluating barrier performance, predicting shelf life, and ensuring packaging materials meet product‑protection requirements.

WVTR is a critical parameter for food, pharmaceutical, electronics, and industrial packaging applications where moisture sensitivity directly affects product stability and performance.

What JIS K 7129 Covers

JIS K 7129 specifies controlled procedures for measuring water vapor transmission rate through plastic films and sheeting. Key elements include:

• Using instrumental WVTR analyzers
• Controlling humidity and temperature conditions
• Measuring moisture permeation through films or multilayer structures
• Reporting WVTR in g/m²·day
• Ensuring consistent sample preparation and conditioning

The method applies to:

• Plastic films and sheeting
• Multilayer barrier structures
• Packaging materials for food, pharma, and industrial goods
• R&D, QC, and material‑development environments

JIS K 7129 ensures accurate, repeatable WVTR data across laboratories and production settings.

Where JIS K 7129 Is Used

This standard is widely used across industries where moisture control is essential:

• Food and beverage packaging
• Pharmaceutical blister and pouch materials
• Electronics and semiconductor packaging
• Industrial barrier films
• Specialty and high‑performance materials
• R&D and quality‑control laboratories

It supports both routine QC testing and advanced barrier‑material development.

Why Water‑Vapor‑Transmission Testing Matters

Understanding WVTR is essential for:

• Ensuring product shelf life and stability
• Evaluating barrier performance of films and laminates
• Comparing material formulations and structures
• Meeting regulatory and customer specifications
• Supporting material selection and packaging design

WVTR testing is a foundational tool for moisture‑sensitive applications.

Testing solutions for JIS K 7129

One product from the Industrial Physics portfolio aligns directly with JIS K 7129’s focus on instrumental WVTR measurement:

Lyssy L80‑6001 Water Vapor Permeation Analyzer

A high‑precision, fully automated instrument designed for accurate measurement of water vapor transmission rate in films, sheeting, and multilayer structures. Its controlled humidity system, sensitive detection technology, and repeatable performance make it ideal for JIS K 7129 workflows in packaging, materials science, and barrier‑film development.

Your Global Test and Measurement Partner for JIS K 7129

Industrial Physics supports packaging manufacturers, converters, and laboratories with the tools and expertise needed to evaluate barrier performance in line with JIS K 7129. From WVTR analyzers to oxygen‑transmission, seal‑strength, and mechanical‑property testing, we help ensure your materials meet demanding performance and regulatory requirements.