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Anonymous Posted 12 years ago
Grammar

Use "IF" or "OF"

Hi, everyone. I'm working for a motor drawing notes. and find a sentence seems no matter use"IF" or "OF" could express the same meaning. what's your opinion of using "IF" or 'OF"
here is the sentence:
ROTOR CORROSION PROTECTION SHALL WITHSTAND 100 HOURS OF ASTM-B117 SALT SPRAY TEST. AT 100 HOURS, NO MORE THAN 1% IF THE ROTOR SURFACE AREA SHALL SHOW SIGNS OF RED OR WHITE RUST.
  

Top answer

ROTOR CORROSION PROTECTION SHALL WITHSTAND 100 HOURS OF ASTM-B117 SALT SPRAY TEST. AT 100 HOURS, NO MORE THAN 1% OF THE ROTOR SURFACE AREA SHALL SHOW SIGNS OF RED OR WHITE RUST.

— AlpheccaStars

  • ROTOR CORROSION PROTECTION SHALL WITHSTAND 100 HOURS OF ASTM-B117 SALT SPRAY TEST.
  • AT 100 HOURS, NO MORE THAN 1% OF THE ROTOR SURFACE AREA SHALL SHOW SIGNS OF RED OR WHITE RUST.
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10 Answers
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ROTOR CORROSION PROTECTION SHALL WITHSTAND 100 HOURS OF ASTM-B117 SALT SPRAY TEST. AT 100 HOURS, NO MORE THAN 1% OF THE ROTOR SURFACE AREA SHALL SHOW SIGNS OF RED OR WHITE RUST.
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ROTOR CORROSION PROTECTION SHALL WITHSTAND 100 HOURS OF PER ASTM-B117 SALT SPRAY TEST. using "per" is better I think
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Kevin Lingusing "per" is better I think
I disagree.
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ROTOR CORROSION PROTECTION SHALL WITHSTAND 100 HOURS OF ASTM-B117 SALT SPRAY TEST. AT 100 HOURS, NO MORE THAN 1% of THE ROTOR SURFACE AREA SHALL SHOW SIGNS OF RED OR WHITE RUST.
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Kevin LingWhy...?
'Per' has the wrong meaning in your effort: 'per' is an indication of rate or reference.
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ASTM-B117 SALT SPRAY TEST is a reference(standard) for spray test
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Kevin LingASTM-B117 SALT SPRAY TEST is a reference(standard) for spray test
If that is true (and I don't think it is; it is just the name of a test), then that's not the point. In the text, that test is to be withstood for 100 hours.
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Kevin LingROTOR CORROSION PROTECTION SHALL WITHSTAND 100 HOURS PER ASTM-B117 SALT SPRAY TEST. using "per" is better I think
No. It isn't. What it would do is show that a non-native writer is trying to be more "scientific" by using a word out of its usual context.

If you insist on using the word "per", then this is better usage:

ROTOR CORRO
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