Legor OXIFEND5 – Concentrated Anti-Tarnish Passivation Solution for Silver and Copper Alloys (250ml)

Legor OXIFEND5 – Concentrated Anti-Tarnish Passivation Solution for Silver and Copper Alloys (250ml)

The Legor OXIFEND5 is a concentrated anti-tarnish passivation solution designed to protect silver, brass, bronze, low-karat gold, and electroplated surfaces. It forms an invisible barrier that dramatically increases resistance to tarnish from hydrogen sulphide, UV exposure, synthetic sweat, and humidity. This solution can be applied chemically or electrolytically, making it ideal for detailed jewellery with hard-to-reach surfaces such as chains and undercuts. One 250ml bottle makes 5 litres of ready-to-use solution when diluted at a 1:20 ratio.

Product Details:

• Solution form: Concentrated liquid
• Colour: Whitish (turns clear when heated and diluted)
• pH: Acidic
• Shelf Life: 18 months
• Dilution ratio: 1:20 (250ml prepares 5L ready-to-use solution)
• Application method: Immersion or electrolytic

Operating Parameters:

• Temperature: 50°C – 60°C (Optimal: 55°C)
• Treatment Time: 5 – 20 minutes (Optimal: 10 minutes)
• pH (ready-to-use): 5.0 – 7.0
• pH (electrolytic with T-SALT): 3.0 – 5.0
• Agitation: Moderate
• Electrolytic Use: Add 2.5g/L of T-SALT and use MMO anodes

Equipment Requirements:

• Materials: Pyrex glass, PVC, or polypropylene tanks
• Heaters: Pyrex, quartz, or PTFE
• Power Supply: DC current rectifier with low ripple
• Anode (electrolytic use): MMO
• Filtration: Magnetic driven filter pump with 50 µm cartridge
• Tank insulation: Recommended for consistent temperature

Pre-Treatment Recommendations:

• Clean items ultrasonically and degrease prior to passivation
• Use neutralisation steps and rinse thoroughly to prevent contamination

Post-Treatment Recommendations:

• Rinse in hot water (60°C – 70°C)
• Dry using hot air (50°C – 60°C)
• Avoid mechanical drying methods

Water Quality:

• Use demineralised water with conductivity below 3 µS/cm for dilution and maintenance

Maintenance Guidelines:

• Monitor refractive index (target: 4 – 6 Brix)
• When R.I. drops by 1 point, add 12.5ml/L of OXIFEND5
• Replace solution every 4–6 months or when naturally exhausted

Safety Documentation:

• Safety Data Sheet
• Technical Sheet

Specifications:

• Weight: 0.3 kg
• Shipping: Hazard Goods
• Brand: Legor
• Solution Type: Anti-Tarnish / Passivation
• MPN: OXIFEND5

Note: Product images are for reference only and may vary from the actual item.