Solder wire & cored solder wire

Thanks to their adjustable properties, solder wires are a versatile raw material for various industries and trades. Our solders guarantee simple and safe processing.

As an established manufacturer with in-depth metallurgical expertise, we offer industrial solder wire and cored solder wire with flux, tailored to different requirements from prototype to large-scale production.

Our product solutions combine consistently defined alloys, precise wire geometries and tailor-made flux technology for efficient processes, high processing stability and optimum soldering quality – regardless of whether manual soldering or automated systems are involved.

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Our solder wire product range
Solder wire
Solder wires made from various metals & alloys
Lead-containing and lead-free solder wire
Flux cored solder wire
Label information
Commodities & Private Label
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FAQs

Our solder wire product range

Source material

Manufactured from standardised alloys and high-purity raw materials.

Coil sizes

50 g | 100 g | 250 g | 500 g | 1,000 g | 2.500 g | 4,000 g | 6,000 g | 10,000 g | 15,000 g

Types of flux

Based on colophony, synthetic resin or organic components.

Flux content

The flux content ranges from 0.5% to 4%.

Flux-core

The flux-cored solder wires are usually designed with 1 to 3 cores.

Wide range of sizes

Available diameters 0.23 mm to 22 mm

Solder wire

Precise material feed without flux

Definition & process potential

Solid solder wire consists exclusively of the respective alloy or high-quality pure metal without integrated flux. This design is used where flux is applied externally or controlled on a process-specific basis – particularly in automated production with high quality requirements.

Advantages of solid wire

Full process control over flux type and quantity
Minimised residues in subsequent surface processes
Greater flexibility for demanding soldering sequences
Reproducible soldering quality across large series runs

Typical industrial applications

We offer a wide range of lead free solder wire and lead-containing alloys as well as high-purity raw materials for manual soldering processes, automated piston soldering systems with separate flux supply and machine wave soldering processes with wire feed.

Areas of application for our soldering wire: telecommunications, industrial electronics, automotive electronics, consumer electronics, electromechanics, selective soldering systems, manual soldering

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Lead-containing and lead-free solder wire

Clear demarcation for industrial applications

Lead-free solder wire is used in particular in regulated markets and sensitive applications, e.g. in the electronics industry in accordance with the RoHS Directive. It is characterised by higher melting temperatures and increased requirements for flux, wetting and process control.

Lead-containing solder wire offers excellent wetting properties, lower melting temperatures and high process robustness. It is preferred where permitted by regulations or technically appropriate.

Lead-free solder wire

Characteristics	Applications
Higher melting points (usually > 217 °C) Higher energy input required Greater importance of effective flux chemistry Very good long-term stability of solder joints	Series production in the electronics industry Selective and robotic soldering Laser soldering / induction soldering Regulatory-sensitive applications

Lead-containing solder wire

Characteristics	Applications
Lower melting points Excellent flow properties High fault tolerance in the process Particularly well suited for repair and reworking processes	High-temperature solders Repair and rework Hand soldering Prototype production Temperature-sensitive components

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Flux cored solder wire

Efficient & reliable

In solder with flux, there is a core inside the wire, filled with flux. The filling compounds and their composition, as well as their activation type and strength, are defined in most cases by international standards. Our tube solders contain high-performance flux from the manufacturer Emil Otto Flux- und Oberflächentechnik GmbH, as well as from our own development and production.

Rosin Core Solder are classic soldering agents based on natural resin. Their good activation and low residue enable reliable wetting of metallic surfaces.

Flux	Activation	Halides	Characteristics	Typical applications
FH-FC-002 (corresponds to ROM1)	medium	containing halide	High wetting and activating effect Residues possible	Lead-free series production Sophisticated electronic assemblies Electronics and wiring harness production
1131 ROL0	low	halide-free	Excellent residue behaviour High long-term stability
1131 ROM0	medium	halide-free	Reliable wetting even on slightly oxidised surfaces Minimal residue

Flux

Activation

Halides

Characteristics

Typical applications

FH-FC-002 (corresponds to ROM1)

medium

containing halide

High wetting and activating effect

Residues possible

Lead-free series production

Sophisticated electronic assemblies

Electronics and wiring harness production

1131 ROL0

low

halide-free

Excellent residue behaviour

High long-term stability

1131 ROM0

medium

halide-free

Reliable wetting even on slightly oxidised surfaces

Minimal residue

These are only the most common filling compounds. Other types of flux are available on request.

In addition to the standard rosin-based fluxes, we have collaborated with renowned flux manufacturer Emil Otto Flux- und Oberflächentechnik GmbH to develop the innovative EO-FC-006 filler compound in the REL0 flux class, which is based on synthetic resin and meets the highest industrial requirements.

Technical design:	Special features:
Halide-free high-performance filling compound Specially developed for lead-free soft solders Base: high-purity synthetic resin Combination with a unique synthetic activation complex	Activation effect at least equal to halide-containing systems Virtually splash-free processing Very low smoke emission Excellent residue behaviour No dark discolouration or sticky residues Consistently high-quality soldering results – even in demanding series processes

Depending on the area of application, this filling compound is also available with halide-containing activators (EO-FC-010).

Organic urea-based fluxes (OR) are particularly activating solders that reliably prepare even heavily oxidised or difficult-to-wet metal surfaces. They ensure secure solder joints in manual, selective or repair soldering. As the residues may contain halides and be hygroscopic, cleaning is usually necessary after the soldering process.

2124 ORH1: The flux used is based on organic components and is classified as ORH1 in accordance with DIN EN 61190-1-1. It is highly activating and contains halides, which means that even heavily oxidised soldering surfaces are reliably wetted. Due to the residues, cleaning is necessary after the soldering process, which is why this flux is particularly suitable for repair and rework processes.

Halide-free fluxes completely dispense with halogen-containing activators and instead rely on modern, synthetic activation systems.

Advantages	Disadvantages
Low risk of corrosion Ideal for no-clean processes Higher long-term reliability of electronic assemblies	Lower activation effect Possibly higher cycle times

Industrial standard: In modern electronics manufacturing, halide-free is now considered state of the art – especially in automated processes.

Halide-containing fluxes contain halogen-based activating components (e.g. chlorides or bromides) that enable very effective oxide removal.

Advantages	Disadvantages
Very high activation effect Reliable wetting even on difficult surfaces	Corrosion risk Potentially critical for long-term reliability

What does "no-clean" mean in relation to solder wire and flux cored wire?

The designation "no-clean" means that the solder used has passed quality reliability tests confirming that the flux residues are suitable for remaining on the assembly. The flux residues are tested for their hygroscopic properties and electrical behaviour at elevated temperatures and high relative humidity.

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What information is on the label?

All technical details can be found on the Feinhütte standard label on the left-hand side: weight, diameter, flux type, flux content and number of cores.

The lower section contains production-related information, i.e. alloy name, production batch and date, and our internal item number. The QR code on the right-hand side is for internal use only.

We use colour bars on the label to clearly and quickly distinguish between the different solder wires: red for lead-containing and green for lead-free.

What types of solder wire coils are available?

Coil colours

Most of our wires are coiled on green, red or black spools. The colour of the coils is used to indicate specific alloy types. Red coils usually stand for lead-containing alloys, green coils for lead-free alloys. Depending on customer requirements, we can also offer other coil colours, although not all coil types are available in different colours.

Coil sizes

The coil weights are selected or defined on the one hand depending on the respective wire diameter (Ø 0.5 mm as a 5000 g coil is technically impossible / Ø 8.0 mm on 100 g coils is also not feasible) – on the other hand, however, they are also determined by the type of processing, the type of machine/system and customer specifications.

Defined coil weights (net product weight) inevitably result in different coil dimensions, which often also have to be checked against the given technical requirements (do the coil holder and dimensions fit the unwinding/processing devices?).

Solder wire production under your brand

Commodities & Private Label

In addition to our own product portfolio for the B2B and retail sectors, we also manufacture solder wire and solder as commercial goods on behalf of our customers. As an experienced partner, we supply well-known brands in the DIY sector and resellers – reliably, scalably and in consistently reproducible quality.

Production takes place under the respective customer brand (private label) and in accordance with defined technical, regulatory and logistical specifications. Our processes are designed to reliably map both near-series volumes and market-specific product requirements.

For B2B partners, resellers and trading companies, we are therefore a reliable production partner along the entire value chain – from metallurgical expertise to market-compliant product delivery.

Scope of services in private label business:

Manufacture of solid solder wire and solder wire with flux under customer brand names
Implementation of customer-specific layouts, wire diameters and coil weights
Reliable delivery capability and consistent product quality
Many years of experience in working with established brands

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Your contact person

Maxim Richter

Head of Sales & Logistics

verkauf@feinhuette.de +49 3731 295 131

Frequently asked questions (FAQ)

Flux cored wire increases efficiency and reduces manual process steps when flux is an integral part of the soldering process. Solid wire is suitable for processes with external flux application or special flux requirements.

Our range of solder wire extends from Ø 0.23 mm to Ø 8 mm with coil weights from 50 g to 15,000 g, as well as in extruded form up to Ø 22 mm. Special dimensions are available on request.

Yes. Our products support manual soldering, selective and wave soldering, as well as robot-assisted soldering processes, with defined alloys and flux options for high process stability.

Flux prepares the surface, promotes wetting and minimises oxides during soldering.

Solder wire & cored solder wire

Our solder wire product range