ASTM D722-93 pdf free.Standard Test Method for Grease Resistance of Paper.
At the end of 10 s elapsed time on the timer，gentlyslide the specimen to a new area on the book paper, checkingthe area of book paper from above which the specimen was justmoved for any signs of staining, indicating that the turpentinecontaining the red dye has penetrated through the test specimen. Continue this process after every 10 s until staining isobserved. Cover the pile of turpentine saturated sand with awatch glass for specimens requiring more than 120 s for stainpenetration to be observed. Discontinue the test at 1800 s evenwhen no staining is observed.
Record the elapsed time between the addition of theturpentine and the first sign of staining of the book paper to thenearest 10 s. When the test is discontinued because it exceeds1800 s, record the result as 1800＋.
It is advisable to make a few preliminary tests todetermine the approximate elapsed time period for stainpenetration if the grease-resistant properties of the sample arenot known.
With experience, and depending upon the time periodrequired for stain penetration, it may be possible to run severalspecimens sequentially.
Report the following information:Maximum and minimum value for the“wire side”facing up,Maximum and minimum value for the“wire side”facing down,Average value for the “wire side”facing up,12.1.4 Average value for the “wire side”facing down,12.1.5 Average value for the sample,and
Number of specimens tested.For any reported average value containing a test resultof 1800+ , include the value of 1800 in the average and followthe average value with the“+”sign.
The critical limit between which twovalues obtained within the same laboratory will fall 95 % of thetime is 60 % of the average value for samples having averagevalues in the range from 30 to 300 s, 68 % of the average valuefor samples having average values in the range from 310 and900 s,and is not known for samples having average valuesgreater than 900 s.
The critical limit between whichtwo values obtained within two different laboratories will fall95 % of the time is 84 % of the average value for sampleshaving average values in the range from 30 to 300 s, 82 % ofthe average value for samples having average values in therange from 310 to 900 s, and is not known for samples havingvalues greater than 900 s.ASTM D722 pdf download.