During high-temperature capillary brazing, rapid surface oxidation and uneven flux distribution frequently lead to porous, compromised joints and costly rework. Castolin Eutectic Flux 1802 N Powder (EU1802N) solves this industrial-grade challenge by utilising heavy-duty Atmosin® technology to actively dissolve stubborn metal oxides and deliver superior surface wetting.
What’s In the Box
Benefit-Driven Technicals
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Atmosin® Surfactant Formulation: Ensures uniform flux spread and maximum adhesion under heat, preventing localised dry spots and metal oxidation.
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Enhanced Capillary Action: Pulls molten high-silver filler alloys deep into tight lap joints for leak-tight, high-strength bonds.
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Active Oxide Reduction: Chemically scours parent metals during heating to allow optimal silver-alloy wetting without requiring harsh mechanical prep.
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Broad Thermal Range: Maintains fluxing activity between 420°C and 820°C to support diverse flame and furnace heating cycles without premature breakdown.
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Customisable Mix Ratio: Dry powder form allows workshop technicians to mix exact paste consistencies using distilled water or alcohol, reducing material waste.
Features & Applications
Features
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Specially formulated for capillary brazing with high-silver content alloys.
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Atmosin® technology for even flux distribution and strong adhesion.
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Reduces metal oxides and activates surfaces for optimal wetting.
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Enhances capillary effect for superior joint strength.
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Suitable for oxy-fuel flames, air-fuel flames, and furnace brazing.
Applications
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Aerospace components
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Automotive assemblies
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Appliance manufacturing
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Heating, Ventilation, and Air Conditioning (HVAC) systems
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General metal fabrication
EWS Expert Note
When mixing this dry powder into a paste, always use distilled or de-ionised water rather than tap water to prevent mineral contamination. Apply a thin, uniform coating to both mating surfaces prior to heating; over-applying flux can trap slag inside the capillary gap and compromise joint integrity under pressure testing.
Pros & Cons
Pros:
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Advanced Atmosin® surfactant delivers exceptional alloy flow and capillary penetration in tight joints.
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High thermal tolerance resists glass-phase hardening, simplifying post-braze residue removal.
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Flexible powder format allows precise mixing for either brush coating or dip applications.
Cons:
Technical FAQs
Q: Which filler metals and parent materials are compatible with this flux?
A: Castolin Eutectic 1802 N is specifically engineered for high-silver content brazing alloys. It is fully compatible with copper, copper alloys, brass, steel, stainless steel, and nickel alloys. It must not be used on light alloys such as aluminium, magnesium, or titanium.
Q: What are the primary operating limits of this flux during flame heating?
A: The flux operates effectively within a temperature range of 420°C to 820°C. Exceeding 820°C for extended periods will burn off the active chemical agents, leading to severe oxidation, poor silver alloy flow, and compromised joint strength.
Q: What compliance and safety standards apply to handling this product in the workshop?
A: EU1802N contains fluorides and requires compliance with UK COSHH regulations. Operatives must utilise local exhaust ventilation (LEV) or appropriate respiratory protective equipment (RPE) matching EN standards, alongside safety eyewear and chemical-resistant gloves to prevent skin and eye contact.
As an Official UK Stockist, Express Weldcare provides genuine Castolin Eutectic equipment with expert technical backup and fast despatch.