Mil-t-3520 ty1 or ty2 mil spec single material response overall
Mil-t-3520,fs1010-fs1025 mil spec single material response overall
Mil-t-3520,ty 1 mil spec 1st material response overall or astm a108 assn std 2nd material response overall or astm a108 assn std 3rd material response overall or astm a108 assn std 4th material response overall