1) n plus 650 (Corrosion Preventer)
 It is produced to prevent and retard the corrosion on iron-steel products. It is commonly used by the companies that test the leakproofing.

2) n plus 655 (Corrosion Preventer)
 It is produced to prevent and retard the corrosion on iron-steel products. It is commonly used by the companies that tests the leakproofing.

3) n plus 680 (Roughness-Corrosion Preventer)
 It is produced to prevent and retard the corrosion on iron and iron-steel products. It is especially produced for the companies which apply welding seam in wet platform and tack.