Freund - Flux for pre-patinated zinc sheet

✔ Recommended by leading zinc manufacturers – Specially developed for RHEINZINK-prePATINA (mill finish, blue-gray, slate gray) and NedZink NOVA
✔ Dissolves factory patina & protective layers – A special formula cleanly breaks down factory-applied pre-weathering passivation layers, without attacking the base metal
✔ Standards-tested professional quality – Complies with DIN EN 29454 3.2.2.A (F-SW11) as professional soldering fluid "ZD-pro"
✔ Flawless solder flow – Ensures optimal wetting and maximum capillary action for visually impeccable, permanently watertight seams
✔ Economical 1.0 kg stock bottle – Large net contents (Item no. 66402030) for the sheet metal workshop and filling jobsite kits

Perfect soldering results on pre-weathered zinc: Flux for patinated zinc sheet (1 kg)

The flux for patinated zinc sheet (Item no. 66402030 / soldering fluid "ZD-pro") is the essential specialist soldering fluid for sheet metal workers, plumbers, and roofers for the professional processing of modern pre-weathered titanium zinc sheets. Factory-prepatinated surfaces such as RHEINZINK-prePATINA® or NedZink "Nova" present particular challenges for tradespeople: standard soldering fluid often cannot open the dense patina evenly, which can lead to uneven solder flow and cold solder joints.

This premium flux, based on zinc chloride, hydrochloric acid, ammonium chloride, and special solvents, was developed specifically for these surfaces and is expressly recommended by leading manufacturers. It precisely removes the passivation layer in the seam area and delivers outstanding capillary action, allowing the solder wire to flow evenly. The generous 1 kg refill bottle is ideal for the workshop and for refilling the FREUND LÖTMAX soldering kit.

Thoughtful features for the demands of everyday sheet metal work

• Manufacturer's recommendation: Tailored to RHEINZINK-prePATINA (blue-gray/slate gray) and NedZink NOVA.
• Consistent capillary action: Soft solder flows deep into the overlapping seam without forming edge ridges or pores.
• Certified to standards: Tested in accordance with DIN EN 29454 3.2.2.A (F-SW11) for the highest processing standards.
• No unsightly etching: With proper cleaning, the adjacent visible surfaces remain flawless.

Technical details at a glance

• Product name: Flux for patinated zinc sheet (soldering fluid "ZD-pro")
• Manufacturer / brand: FREUND / FELDER Soldering Technology (Item no. 24110570)
• Item number (SKU): 66402030
• Contents / weight: 1.0 kg net contents
• Standard: DIN EN 29454 3.2.2.A (F-SW11)
• Chemical base: Zinc chloride, ammonium chloride, hydrochloric acid, and solvents
• Recommended for: RHEINZINK-prePATINA® (bright-rolled, blue-grey, slate-grey), NedZink NOVA, galvanized steel sheet
• Soldering method: Soft soldering in roofing and sheet metal work

Matching accessories & additions

• FREUND LÖTMAX soldering kit: SKU: 03310000 (The sturdy 3-in-1 soldering station with anti-slip mat)
• Sal ammoniac block: For cleaning and tinning the copper soldering iron
• Acid- and heat-resistant soldering brush: For precise application at the seam overlap

Why ZD-pro Flux 66402030 Belongs in Your Workshop

The key advantage lies in its approval for and compatibility with pre-weathered branded sheets. You avoid time-consuming sanding of visible surfaces, prevent complaints caused by leaking seams, and meet the manufacturer's specifications exactly for a lasting warranty.

Ensure flawless solder seams on pre-patinated titanium zinc. Order the Flux for patinated zinc sheet (1 kg) now from the roofing trade shop at your roofing specialist Roofify!