ISO 8502-4

Introducing ISO 8502-4 – Industrial Physics

ISO 8502-4 is an international ISO standard procedure for estimating condensation levels in environments where you apply paints and coatings to steel substrates.  

Regular maintenance and retreating with protective coatings limits degradation and prevents the onset of rust. Proper steel substrate preparation is important as it ensures the long-term performance of any protective coatings you apply.  

Some paints and coatings need to be applied in dry conditions when they’re applied to steel structures. Using a dewpoint meter and following the ISO 8502-4 process will help you to ensure the conditions are optimal or acceptable. 

What factors influence steel substrate preparation?

The main factors that can influence steel substrate performance and preparation can be categorized as follows:  

• Presence of rust and mill scale 
• Presence of surface contaminants, including salts, dust, oils and greases 
• Surface profile. 

What’s does ISO 8502-4 focus on?

Part four of the ISO 8502 standard focuses on estimating the probability of condensation prior to paint application. It’s used to establish whether conditions at the job site are suitable for painting or not. 

You’ll often find that thin films of condensed water are difficult to spot. So, it’s important to have a method that will give you an accurate estimate of the probability of condensation forming, prior to the application of any paint.  

Following the ISO 8502-4 standard process will do this for you.

ISO 8502-4 testing devices

So, how can Industrial Physics improve your ISO 8502-4 paint testing? 

Dewcheck 4 series 2 – dewpoint meter
The TQC DewCheck 4, dewpoint meter is a versatile dewmeter to measure and record all climate parameters required to treat surfaces.  

This easy to use and robust dewmeter conforms to ISO 8502-4 & ASTM D3276-07 standards. It measures the relative humidity (%RH), ambient temperature (Ta) and surface temperature (Ts). It also calculates the dewpoint temperature (Td) and the difference between the dewpoint temperature and the surface temperature (ÄT).
The difference between the surface temperature and dewpoint temperature indicates the optimal climate conditions for painting. All parameters can be stored in the dewmeter’s memory, tagged with a date and time. 

Dewcheck 4 docking station
To make the most of the data logging facilities of the TQC Dewcheck 4 dewpoint meter, check out the DewCheck 4 docking station. 

It features three strong neodymium magnets which hold both the instrument and dock firmly against ferrous steel surfaces. Our dewmeter docker includes a magnetic surface temperature sensor which overrides the instrument’s integrated surface temperature sensor. This is perfect for ISO 8502-4 inspection, and it guarantees correct surface temperature readings. 

Need ISO 8502-4 testing solutions? Get in touch

We’ve learnt a thing or two about paint testing over the decades. Now Industrial Physics is recognized as a brand that likes to bring new, innovative paint testing equipment to market. 

We like to share our knowledge and we’re here to help you to answer your questions about paint testing. Across the knowledge base of our website we publish lots of blogs on related subjects. Why not check out this one on whether manufacturers should switch to water based paints? Perhaps you’ll also find our paint consumption calculator of some use.  

If you have any questions about ISO 8502-4 and how we can help you with your paint testing, then please just get in touch!  

Your global test and measurement partner for ISO 8502-4