请教一句话：For use only as an oil and water repellant at a level not to exceed 0.17 pound (0.09 pound of fluorine) per 1,000 square feet of treated paper or paperboard of a sheet basis weight of 100 pounds or less per 3,000 square feet of paper or paperboard. 我个人理解为：这个物质的使用量每1000平方英尺不超过0.17磅，然后可能这1000平方英尺的纸或纸板有100磅，但是后面黄色的这部分加进来是什么意思呢？
For use only as an oil and water repellant at a level :
(1) Not to exceed 0.17 pound per 1000 square feet of treated paper or paperboard having a sheet basis weight equal to 100 pound/3000 square feet or less than 100 pound/3000 square feet
And
(2) Not to exceed 0.5 pound per 1000 square feet of treated paper or paperboard having a sheet basis weight greater than 100 lb per 3000 square feet as determined by……
= = = = = =
In short:
For use only as an oil and water repellant at a level :
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