"NSN USED TO PURCHASE A MINIMUM OF 160 CONTAINERS AND UP;CERTIFICATION PWA 1321,AVCO M 3952A,GE B50TF33 AND RR 9507/4;RB 70-80 HARDNESS;2500 PSI MINIMUM STRENGTH FOR SMOOTH SURFACES AND 5000 PSI MINIMUM STRENGTH FOR ROUGHENED SURFACES;COARSE AS SPRAYED,GROUND GOOD;NICKEL CLAD ALUMINUM COMPOSITE POWDER.REACTS EXOTHERMICALLY DURING SPRAYING TO FORM METALLURGICAL BONDS WITH ALL SUBSTRATES EXCEPT COPPER AND ITS ALLOYS.COATINGS ARE TIGHT,DENSE;RESISTANT TO TEMPREATURES TO 1800DEG (F), THERMAL SHOCK AND EROSION"