Two types of corrosion testing have been used to verify the corrosion protection provided by this protector system:

Salt Spray Test (ASTM B117)

       The test fixture was composed of a properly torqued nut and bolt on a flange with the protector installed. It was subject to a 5% salt solution in a salt fog cabinet according to ASTM B117 procedures. After 90 days, the carbon steel nut and bolt were both free of corrosion

Sour Gas Test (NACE TM 0177-96)

       This test showed what protection was given by this protector on a B7 stud in H2S corrosion environment. The environment for the exposure was a moist (100% relative humidity), in an atmosphere containing H2S. After 90 days, the carbon steel nut and bolt were both free of corrosion.

Figure 2. The appearance of fasteners after a 90-day exposure in the ASTM B-117 salt spray test. The fastener protected with the NUT-SEAL system is the only one free of corrosion.