Can anyone send me an ASTM method for determination acidity of MDI for use in the production of polyurethane?

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Botros S Meglaa

thank you Amin

Nizar Matar

Just a simple note which may help in your research project: Pure MDI has very little acidity; most commonly it has from 1 to 10 ppm HCl acidity, no more.

Determination of acidity of MDI (as percent HCl) is done by the cold method given in the attached link.

https://dowac.custhelp.com/app/answers/detail/a_id/5788/~/dow-polyurethanes---isonate-mdi-acidity-test-method

dear Dr Nizar

MDI i used isn't pure MDI but mixture between 2,4 and 4,4 MDI

Seyed Alireza Hosseini Hafshejani

dear botros

This is my problem too.

could you tell me,if you found your answer.

best regards