What Does "W" Represent in Acid Number and Softening Point?

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SUMMARY

The discussion clarifies that the 'W' in acid number and softening point notation, such as 8W60 and 130W180 °C, is a misprint originating from a Japanese patent application. The correct interpretation is that 'W' should be read as a tilde (~), indicating a range, specifically 8~30 for acid number. This correction is crucial for accurate understanding and application in resin specifications.

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Chemists, materials scientists, and professionals involved in resin formulation and quality control will benefit from this discussion, particularly those interpreting technical specifications and patents.

Rajini
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Dear PF users,

We know what is meant by acid number and softening point for resins.
If it is mentioned as acid number is 8W60 and softening point is 130W180 °C, I am just confused what about 'W' in between those numbers..

Thanks for your reply.
Regards, Rajini.
 
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Is that nomenclature coming from your resin supplier? If yes, which one? Could the 'w' be a misprint perhaps? It might have been meant to be a hyphen, for example.
 
Hi Chemistree,
Yes, it is a misprint of some Japanese patent application. 8W30 should be read as 8~30 (8 to 30). When look into PDF file my doubt got cleared.
Thanks, Rajini.
 

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