Wallcolmonoy Nicobraz Green Stop-Off, Type I, Felt-Tip Pen 10 mL, 12/box | GSOPEN

Designed for all-purpose use, Nicrobraz Green Stop-Off can be used with almost any type of base metal (except reactive metals, such as titanium and zirconium), any brazing method, or any brazing filler metal. It is the finest surface-protection agent made, and as such, provides the best assurance you can get that filler metal will not reach any protected metal surface. By confining the filler metal to joint areas, the amount of required filler metal may be greatly reduced. In addition to its primary function of protection against brazing filler metal where it is not wanted, it is used to protect areas not meant to be overlaid when flame spraying metallic coatings. Nicrobraz Green Stop-Off will not contaminate the atmospheres used in general furnace brazing applications.

The felt tip pen is the easiest-to-use form. Besides making barriers against the flow of molten metals with the stroke of a pen, it can be used for making heat resistant markings on any metal surface. Markings will survive temperatures through 1650°C (3000°F) in the brazing furnace.

Application Procedure

Shake pen well before and during use. Ensure that pen is shaken sufficiently to hear the mixing ball rattle, prior to use. To start flow, press pen tip down several times until it is saturated. Draw lines, as with any marker pen, on surfaces that are clean and free of oils, rust or wax. To replenish flow, press down once. Keep capped when not in use.

Removal Procedure

Nicrobraz Green Stop-Off residue remaining after brazing is not harmful to surfaces and may be removed by any of several methods. (1) vapor blasting, (2) grit blasting, (3) wire brushing, (4) polishing, (5) pickling in a solution of deionized or distilled water, nitric acid (10%), and hydrofluoric acid (2%), heated to 65°C (150°F).

Recommended Uses

Use Nicrobraz Green Stop-Off to prevent the flow of brazing filler metal into threads, holes, cast surfaces, and the like. It can be used with almost any base metal, ferrous or non-ferrous. The exceptions are reactive metals such as titanium, zirconium, and their alloys (which require Nicrobraz Orange or Blue Stop-Off). Nicrobraz Green Stop-Off holds back any type of brazing filler metal, including nickel-based, copper, silver, etc.