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High-Temp Black Brazing Flux Paste
Superior No. 601B/3411 General Purpose Black Brazing Flux is a Boron-modified flux that meets the AMS 3411 specification. It is formulated for applications where temperatures reach 980°C/1800°F, such as saw-blade carbides.
Superior No. 601B/3411 can be purchased through McMaster-Carr (www.mcmaster.com). See below for McMaster-Carr part numbers. We also welcome direct sales.
| Superior Flux Number |
Description | Rec. Base Metals |
Rec. Filler Metals |
Rec. Temp Ranges | Specs. | MSDS | Spec. Sheet |
| No. 601B/3411 | High-temp, black brazing flux paste; boron-modified. | Ferrous and non-ferrous alloys, stainless and carbide | BAg BCuP |
565-980°C 1050-1800°F |
AMS 3411; AWS A5.31-19, Type FB3C; O-F 499, Type B |
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Superior No. 601B/3411 is RoHS compliant.
McMaster-Carr Part Numbers for No. 601B/3411
| Packaging Size | Description | McMaster-Carr Part No. |
| ½-lb. | Black Flux | 7645A41 |
| 1-lb. | Black Flux | 7645A51 |
Superior No. 601B/3411 is a boron-modified, hi-temp silver brazing paste flux that meets AMS 3411 specifications. Whereas the typical silver brazing white flux (see Silver Brazing White Flux Paste) is active to 870°C/1600°F, No. 601B/3411 black brazing flux paste is active to 980°C/1800°F.