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Category: Separation Technology
Question: How many different standards are used in defining screen mesh?
Keywords: mesh,screen,standards,definition,astm,imm,bss,tyler,french
Answer: There are five common standards used worldwide:
  • ASTM (American Society for Testing Materials)
  • BSS (British Standard screens)
  • IMM (Institute of Mining and Metallury, U.K.)
  • Tyler Screens (U.S.)
  • French Screens
The Tyler and ASTM are the standards used in the U.S. Sieve opening sizes decrease with increasing Mesh number in all standards except French. In the French standard, the Mesh number increases with increasing opening sizes.


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