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SUPERIOR FLUX & MFG. CO.. ENVIRONMENTALLY SAFE BRAZING FLUXES DR. Y. BASKIN SUPERIOR FLUX & MFG. CO. INTERNATIONAL BRAZING & SOLDERING CONFERENCE FEBRUARY.

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Presentation on theme: "SUPERIOR FLUX & MFG. CO.. ENVIRONMENTALLY SAFE BRAZING FLUXES DR. Y. BASKIN SUPERIOR FLUX & MFG. CO. INTERNATIONAL BRAZING & SOLDERING CONFERENCE FEBRUARY."— Presentation transcript:

1 SUPERIOR FLUX & MFG. CO.

2 ENVIRONMENTALLY SAFE BRAZING FLUXES DR. Y. BASKIN SUPERIOR FLUX & MFG. CO. INTERNATIONAL BRAZING & SOLDERING CONFERENCE FEBRUARY 18, 2003 SAN DIEGO, CA

3 MOTIVATION FOR SAFER FLUX DEVELOPMENT  Cleaner effluents  Better workplace air quality  Improved health and safety in brazing operations

4 ELIMINATION OF HAZARDOUS CHEMICALS AND METALS  Cadmium from Brazing Filler Metals  Lead from Plumbing Soft-Solders  CFC Solvents from All Applications  Hydrazine from Industrial Applications  Asbestos from Insulation

5 COMMON BRAZING FLUX CHEMICALS  Boric Acid  Boron Oxide  Elemental Boron  Potassium Bifluoride  Potassium Fluoride  Potassium Pentaborate  Potassium Tetraborate  Silicon Dioxide  Sodium Tetraborate (Borax)  Wetting Agents

6 KBF BRAZING FLUX DIAGRAM

7 HAZARDS ASSOCIATED WITH GENERAL-PURPOSE FLUXES  Working with raw flux  Brazing at elevated temperatures when HF and BF 3 gases are released  Discharging raw flux and flux residues into plant effluent, and entry into water system

8 EXPOSURE LIMITS AND HAZARD LABELS FLUORINE ACGIH OSHA NIOSHOSHAD.O.T. COMPOUNDTWA-TLV TWA-PEL TWA-RELLabelLabel Boron Trifluoride1 ppm 1 ppm 1 ppm-Poison Hydrogen Fluoride3 ppm 3 ppm 3 ppmToxicCorrosive Potassium Bifluoride2–5mg/m 3 2–5mg/m 3 2–5mg/m 3 ToxicCorrosive Potassium Fluoborate 2–5mg/m 3 2–5mg/m 3 2–5mg/m 3 Toxic- Potassium Fluoride2–5mg/m 3 2–5mg/m 3 2–5mg/m 3 Toxic-

9 POTENTIAL HEALTH ISSUES FROM FLUORIDE-BEARING FLUX  Irritation to skin and fingernails by the raw flux.  Irritation of the eyes, mucous membranes, and respiratory system by gases and fumes generated during brazing.  Calcium depletion (sclerosis) of the bones, and mottled teeth from long-term exposure to fluoride gases and fine-fume particles.  Potential health hazards from discharge of untreated flux and flux residues into water supply.

10 PHYSICAL PROPERTIES OF SILVER- BRAZING FLUX WITHOUT POTASSIUM BIFLUORIDE * Form:Creamy Paste Color:Off White Specific Gravity:1.5 Water Content:Less than 35% 22  C/72  F:140,000±14,000 Centipoises Fluorine Content:18.0% Flash Point:None Freezing Effects:None Heating Effects to 50  C / 122  F:None Activity Temperature Range:485–870  C /  F * not boron-modified

11 PHYSICAL PROPERTIES OF FLUORIDE-FREE SILVER- BRAZING FLUX Form:Creamy Paste Color:White Specific Gravity:  C/ 72  F:225,000 ± 20,000 Centipoises Fluoride Content:Less than 50 ppm Flash Point:None Freezing Effects:None Heating Effects to 50  C/122  F:Minimal Activity Temperature Range:  C /  F

12 TEMPERATURE RANGES FOR FLUXES AND FILLER METALS Recommended Activation Maximum Flux TemperatureTemperature Average Fluoride-Bearing570  C / 1050  F870  C / 1600  F Fluoride-Free670  C / 1240  F870  C / 1600  F Recommended Filler Liquidus Maximum Alloy TemperatureTemperature BAg-28 (40% Ag)710  C / 1315  F802  C / 1475  F BAg-36 (45% Ag)688  C / 1270  F785  C / 1450  F BCuP-4 (6% Ag) 718  C / 1325  F 785  C / 1450  F

13 FILLER METAL SPREAD AS A FUNCTION OF BASE METAL, FILLER ALLOY, AND FLUX BASE FILLER ALLOYS METAL FLUXBAg-28BAg-36BCuP-4 Brass Fluoride-FreeExcellent ExcellentExcellent Fluoride-BearingExcellent ExcellentExcellent Copper Fluoride-FreeModerate ModerateModerate Fluoride-BearingExcellent ExcellentPoor Mild Fluoride-FreeModerate ModeratePoor Steel Fluoride-BearingModerate ModeratePoor Furnace Temperature: 785C/1450FTime in Furnace: 60 Seconds Excellent Spread: >2.0cm 2 Moderate Spread: >0.5cm 2 <2.0cm 2 Poor Spread: <0.5cm 2

14 PHYSICAL PROPERTIES OF HIGH TEMPERATURE FLUX WITHOUT POTASSIUM BIFLUORIDE Form:Creamy Paste Color:Dark Brown Specific Gravity:1.7 Water Content:Less than 30% 22  C / 72  F:200,000 ± 20,000 Centipoises Fluorine Content:3% or Lower Flash Point:None Freezing Effects:None Heating Effects to 50  C/122  F:None Activity Temperature Range:  C /  F

15 PHYSICAL PROPERTIES OF FLUORIDE-FREE HIGH TEMPERATURE BRAZING POWDER FLUX Form:Powder Color:White Specific Gravity:1.5 (Average) Fluorine Content: Less than 50 ppm Volatile Content: <0.1% Flash Point: None Freezing Effects: None Heating Effects to 50  C/122  F: None Activity Temperature Range:760–1205  C/  F

16 BASE METAL, AND FILLER METAL RELATIONSHIPS Flux CategoryBase MetalsFiller Metals Silver Brazing Copper and Copper-based All (BAg) Alloys without Potassium Alloys, Ferrous AlloysPhos-Copper Bifluoride Stainless Steel (BCuP) Alloys Silver BrazingCopper and Copper-basedCd-Free BAg Alloys Fluoride-FreeAlloys, Select FerrousPhos-Copper BCuPAlloys High TemperatureFerrous Alloys, CarbidesCDA 681, CDA 773; Brazing withoutManganese containing Potassium BifluorideNickel Alloys High TemperatureFerrous Alloys, CarbidesCDA 681, CDA 773; Brazing, Fluoride-FreeManganese containing Nickel Alloys

17 PRIMARY SKIN IRRITATION STUDY OF SILVER BRAZING FLUXES FLUX WITHOUT FLUORIDE-FREE POTASSIUM POTASSIUMFLUXBIFLUORIDE BIFLUORIDEFLUX PRIMARY DERMAL IRRITATION INDEX (PDII) CLASSIFICATIONNot a primary Not a primary A primary irritant. Non-irritant. Non- irritant. corrosive to skin.corrosive to skin.Corrosive to skin. * The Non-Corrosive/Corrosive dividing measurement is 5.0. The Draize scoring system is used for defining the skin irritation levels.

18 BENEFITS OF USING FLUORIDE-FREE FLUX  Addresses workplace safety by reducing toxic emissions  Addresses the long-time issue of skin and fingernail irritation  Substantially reduces the fluoride effluent emission in local and regional waterways  Complements the Cadmium-Free workplace with much safer fluxes

19 SUPERIOR MANUFACTURES QUALITY FLUXES. OUR BUSINESS IS SOLVING PROBLEMS


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