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International Standards

ASTM F 1249

Introducing ASTM F1249 - Industrial Physics  

ASTM F1249 is a global ASTM test method to measure the water vapor transmission rate (WVTR) through plastic films and sheeting using a modulated infrared sensor. 

The water vapor transmission rate is an important property for flexible barrier testing of any packaging materials and can often be directly related to shelf life and packaged product stability.  

ASTM F1249 works with sheets and films up to 3mm (0.1 in.) thick. It’s a water vapor transmission rate test that can be used with single or multilayer synthetic or natural polymers and foils, including coated materials.  

As well as offering a method for accurate water vapor transmission rate testing it will also show you a film’s permeance to water vapor.  

You can use the data gathered from the ASTM F1249 standard as a referee for plastic sheet testing and plastic film testing, if both vendor and customer agree on sampling and standardization  procedures. Plus you’ll also need to agree on the right WVTR test conditions and acceptance criteria. 

It’s wise to note that water vapor permeance and water vapor permeability readings should be used with caution. That’s because the inverse relationship of WVTR to thickness - and the direct relationship of WVTR to the partial pressure differential of water vapor - may not always apply. 

To avoid confusion, it’s also worth pointing out water vapor transmission rate is sometimes referred to as moisture vapor transmission rate (MVTR).  

Why is WVTR testing important?

It stands to reason why you don’t want water vapor to permeate through a packaging film or barrier. It’s important in the food sector – not many customers enjoy a soggy potato chip! And it’s vital for makers of sensitive electronics in the automotive or aerospace sectors, for example. 

Simply put, the water vapor transmission rate or moisture vapor transmission rate (MVTR) shows you the mass of water vapor that passes through a measured area in a specified time, under controlled conditions. 

You can achieve all of this with a water vapor analyzer. Most of our instruments offer a wide measurement range of 0.002-1000 g/m²/day and precision temperature, humidity, and flow control. So you can rest easy, knowing that you will achieve accurate, repeatable results. 

ASTM F1249 testing equipment 

So, how can Industrial Physics improve your ASTM F1249 testing?  

AquaSense 7101 water vapor permeation tester 

Brought to you by Systech Illinois, our specialist moisture, gas and oxygen analysis company, this water vapor transmission rate analyzer offers you the latest in high-sensitivity coulometric sensor inspection.  

Our water vapor analyzers are ideal for ASTM F1249 testing and offer a wide measurement range of 0.002-1000 g/m²/day with precision temperature, humidity and flow control. These WVTR testing devices give you accurate, repeatable results for research and development testing. They can be used to test both existing - and brand new - formulated packaging film materials for your quality control. 

Need ASTM testing solutions? Get in touch

We like to share our knowledge and we’re here to help you and answer the most frequently asked questions in permeation testing. Check out some of the information we’ve compiled on the related standards and the instruments we can offer in our permeation testing FAQs article. 

If you’d like a more detailed look at the various WVTR analyzers and testing solutions we make at Industrial Physics, check out our permeation guidebook. 

Don’t let a little water vapor permeation spoil your carefully designed products and packaging. Get in touch today to find out more about the many types of water and oxygen permeation testing equipment and accessories we can offer! 

Contact us - Industrial Physics 

Your global test and inspection partner for ASTM F1249