ASTM B117 Salt Spray Test

By March 29, 2014Uncategorized


ASTM B117 Salt Spray Specification

For our experiment, we used two separate sets of fasteners.

The first set was socket head cap screws. 1.5” x 0.375”-16. 18-8 Stainless Steel.

The second set was hex bolts. 4” x 0.375”-16. 18-8 Stainless Steel.


One set was processed with our own proprietary NL-19® and the other set was left untreated.

An approved ASTM B117 Salt Spray Chamber at a third party laboratory was used for the test. The socket head cap screws and hex bolts were placed on a tray within the machine. The unit was initiated and set to 130 degrees Fahrenheit.

Then we left the two sets of screws in the machine continuously for 5 days (120 hours) straight. Afterwards, the two sets of screws were removed from the machine and exposed them to the open air environment for 4 days (96 hours). We repeated the same process again for the next seven days.

In conclusion, we exposed the fasteners to a total of 12 days (288 hours) in the Salt Spray machine and 4 days (96 hours) of open air exposure. That is 7 times longer than the standard 48 hours required. We are thrilled with passing result which means no corrosion to the NL-19® processed product.

As you can see in the pictures, the socket head cap screws and hex bolts that were treated with NL-19® showed no discoloration or signs of corrosive activity.  On the other hand, the untreated stainless steel socket head cap screws and hex bolts were discolored and showed corrosion.

We believe that if the stainless steel Socket Head Cap Screws and Hex Bolts were exposed with natural UV lighting during this test, it would have accelerated the process, produced more discoloration, and corrosive bleeding.

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