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VOC-Free Water-Based Flux for Lead-Free Soldering

DKL Clearflow 7000 is a high-performance, VOC-free water-based flux specifically designed for modern lead-free wave and selective soldering applications. This innovative VOC-free formulation dramatically reduces emissions while delivering excellent defect-free soldering results on challenging board finishes including OSP, ENIG, Ag, Sn, and HASL.

Property	Value	Performance Benefit
Flux Classification (J-STD-004B)	ORL0	IPC compliant no-clean
Colour	Clear	High application visibility
Solids Content	3.8%	Minimal Residue
Specific Gravity @25°C	1.013	Consistent performance
Quantitative Halides	Halide Free	Maximum reliability
Halogen Content	Halogen Free	Industry compliance
SIR & Copper Tests	Pass (J-STD-004B/A, Bellcore GR78)	Proven long-term reliability

Non-flammable & environmentally responsible: Perfectly suited for modern facilities seeking to reduce VOC emissions while maintaining soldering excellence.

Water-Based VOC-Free Technology

Zero VOC emissions – Non-flammable – Environmentally responsible

Clearflow 7000 eliminates VOC concerns while providing sustained fluxing activity through dual wave and selective soldering systems. Residues are minimal, non-greasy, and can be safely left on assemblies or easily removed with warm water.

• Wide process window flexibility
• Spray, foam, wave, brush compatible
• Ultrasonic spray recommended

Lead-Free Soldering Performance

SAC305 – SN100C® – All lead-free alloys

Engineered for 255-270°C solder pots with 100-135°C preheat. Proven performance across all modern lead-free alloys and demanding PCB surface finishes.

• OSP, ENIG, Immersion Ag, Sn, HASL
• Conveyor speeds 1-1.5 m/min
• Defect-free soldering results

UK Manufactured – Production Ready

1L, 5L, 10L, 25L containers – Bulk available

Manufactured to the highest standards and then distributed from Grangemouth, Scotland. Standard PPE required (eye/skin protection). Full MSDS available on request.

• Immediate UK dispatch
• Technical support included
• Process optimisation available

Next-Generation Water-Based Soldering Flux

DKL Clearflow 7000 represents the future of environmentally responsible soldering fluxes — delivering world-class performance with zero VOC emissions and full IPC compliance. Contact DKL Metals for technical evaluation, samples, and optimised process parameters for your specific soldering equipment.

Clearflow 7000: Frequently Asked Questions

Is DKL Clearflow 7000 compatible with SN100C?
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Yes, this VOC-free water-based flux is specifically engineered for high-performance lead-free alloys like SN100C® and SAC305. It provides excellent wetting and hole-fill in both wave and selective soldering environments.

Does Clearflow 7000 require board washing?
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As an ORL0 classified flux, it is designed for “no-clean” applications where residues are minimal and non-corrosive. However, because it is water-based, any remaining residue is fully water-soluble and can be easily removed with warm water if your process requires it.

What is the recommended pre-heat temperature?
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For optimal results with VOC-free flux, we recommend a top-side pre-heat temperature of 100-135°C. This ensures all water is evaporated before the PCB contacts the solder wave, preventing spitting or solder balls.

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IPC-Compliant Low Residue Flux for Electronics Assembly

Clearflow 300 is a high-reliability, low-solids no-clean solder flux designed for modern electronics manufacturing. This IPC-compliant low residue flux for electronics assembly delivers exceptional performance with minimal, non-corrosive residues that require no post-solder cleaning. Engineered for wave soldering, foam fluxing, spray applications, and rework across through-hole, SMT, and mixed-technology assemblies.

Property	Value	Performance Benefit
Appearance	Liquid, Clear & Colourless	High visibility during application
Solids Content	2.14% wt/wt	Minimal Residue
Specific Gravity (25°C)	0.797	Consistent application
Acid Value	16.5 mg KOH/g (typ)	Optimal fluxing activity
Halide Content	None	Halide-free reliability
Flash Point	13°C	Safety compliant
Shelf Life	One year from supply	Long storage stability

Classified ORL0 per IPC J-STD-004B: Organic-based, low activity, completely halide-free no-clean flux.

Minimal Residue Performance

No-clean – Tack-free – Non-corrosive

Advanced low-solids formulation leaves benign, non-tacky residues that are safe on copper alloys. Clearflow 300 is designed to exceed the IPC J-STD-004B requirements for soldering fluxes, ensuring long-term reliability without cleaning.

• IPC-SF-818 & Bellcore TR-NWT-000078 compliant
• High surface insulation resistance
• No degradation over service life

High-Reliability Soldering Performance

Rapid wetting – Excellent fluxing – Robust joints

Achieves fast wetting on diverse PCB finishes, forming bright, smooth, high-strength solder joints. Ideal for high-reliability applications requiring aesthetic excellence and mechanical durability.

• Works on all PCB surface finishes
• Bright, pleasing joint appearance
• Proven in production environments

Versatile Wave Soldering Flux

Spray/foam compatible – All assembly types – Rework capable

Recommended preheat 80-105°C topside. Available in 5L and 10L containers. Treat as corrosive – use PPE.

• Through-hole, SMT, mixed-tech
• Wave, selective, rework applications
• Full TDS available

Optimised for use with lead‑free alloys such as Nihon Superior SN100C®.

Excellent with SN100C

UK Manufactured High-Reliability Flux Solution

DKL Metals proudly supplies Clearflow 300 no-clean flux for demanding electronics assembly. Contact our technical sales team in the UK for pricing, samples, and on-site application support for your specific wave soldering equipment. Compatible with all standard wave soldering equipment.

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Composition and Impurity Limits – E-Qual SMQ 63/37 solder

The table shows typical compositions and impurity limits for E-Qual SMQ 63/37 solder aligned with ISO 9453 and USA J-STD-006 standards. Recommended maxima in use help control bath quality.

* Sum of all impurities except Sb, Bi, and Cu: 0.08% max for Alloy 102 and Alloy 101.

** Combined total for Cu + Au in bath control as indicated.

*** Not specified in ISO 9453 for these alloys.

Key Features

• Consistent, clean, well-formed joints
• High yields and low production costs
• Reduction in icicling and bridging
• Low fillet formation for precision
• Reduced product usage and machine maintenance
• Meets or exceeds internationally recognised standards
• Optimum performance and batch consistency
• Suitable for RoHS exempt applications

Quality Control and Analysis

We manufacture all E-Qual solder alloys under a certified Quality Management System. Since 1991, DKL Metals has maintained third-party accreditation of its QMS. We conduct strict quality control at all manufacturing stages. Each solder bar carries a grade and unique batch number for full traceability. Unlike many producers, we offer a free regular solder analysis service to monitor bath contamination and provide guidance to maintain solder quality within strict parameters.

Economy and Anti-Dross Measures

E-Qual solders are competitively priced and feature a special anti-drossing treatment to reduce dross formation and material loss during use. This treatment remains effective while you top up with E-Qual solder. To assist safe handling, we provide customers with free re-sealable dross containers.

Product Range

We supply a wide variety of E-Qual solder wires in cored and solid forms, compatible with our solder bars and fluxes. Options include standard resin-cored, low-solids, halide-free synthetic resin cored, and water-washable wires. We offer wires in many diameters to suit almost all applications, with separate datasheets available on request.

Fluxes and Accessories

Our comprehensive range includes fluxes, cleaners, thinners, and additives to support most assembly processes. Contact us to discuss your requirements and receive appropriate technical datasheets.

Forms and Packaging

Learn More!

Gov.uk – RoHS compliance and guidance

DKL – Industries that still rely on Leaded Solder

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96TSC (SAC387) is a high-quality, lead-free electronic solder alloy composed of approximately 95.5% tin, 3.8% silver, and 0.7% copper. This proprietary refinement of the traditional Sn96.5 Ag3.5 (Sn96, 96S) binary eutectic alloy offers excellent solderability and mechanical strength, making it ideal for demanding electronics manufacturing applications. Its uniform eutectic melting behaviour ensures reliable, consistent solder joints in wave, selective, and dip bath soldering systems.

Chemical Composition

Key Benefits

• Refined SAC387 eutectic alloy with enhanced solderability
• Excellent mechanical strength and joint reliability
• True eutectic composition eliminates melting range span
• Compatible with all standard flux types, including no-clean fluxes
• Suitable for wave, selective, and dip bath soldering applications
• Lead-free, reducing handling and environmental hazards

Typical Applications

• Electronic assembly and manufacturing processes
• Precision soldering for high-reliability components
• Wave, selective, and dip bath soldering production lines
• Lead-free soldering requirements for RoHS compliance

Why Choose DKL Metals’ 96TSC?

DKL Metals offers 96TSC (SAC387) electronic solder bars manufactured under strict quality control to provide consistent alloy composition and excellent performance in modern electronics manufacturing. Supported by expert technical advice and UK-based supply, this alloy meets the demands of advanced soldering applications with reliability and environmental responsibility.

Learn More!

DKL Metals – Soldering with 96TSC

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97TSC (SAC305) is a high-purity, lead-free electronic solder alloy composed of 96.5% tin, 3% silver, and 0.5% copper. Designed as a reliable and cost-effective substitute for traditional tin/lead solders, this alloy delivers strong, dependable solder joints and enhanced corrosion resistance. Its consistent alloy composition makes it ideal for modern electronics assembly applications requiring RoHS compliance.

Chemical Composition96TSC SAC387 Electronic Solder

Key Benefits

• Consistent composition enabling strong, reliable solder joints
• Enhanced corrosion resistance for long-term reliability
• True eutectic alloy for predictable melting and solidification
• Suitable for wave, selective, and dip soldering applications
• RoHS compliant, lead-free, and environmentally friendly

Typical Applications

• Electronics assembly requiring lead-free solder
• RoHS-compliant manufacturing processes
• Wave and selective soldering production lines
• Repair and rework applications in consumer and industrial electronics

Why Choose DKL Metals’ 97TSC?

DKL Metals offers 97TSC (SAC305) electronic solder bars with stringent quality controls and UK-based supply for reliable delivery. Supported by expert technical advice, this alloy is the trusted choice for modern electronics manufacturers committed to lead-free soldering standards.

Learn More!

DKL Metals – About 97TSC Electronic Solder

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Key Features

•  Lead-free and RoHS compliant
•  Specifically formulated to top-up SN100C solder baths
•  Maintains nickel and germanium levels while reducing copper
•  Minimises dross formation and copper dissolution
•  Produces bright, smooth, and reliable solder joints
•  Ideal for wave soldering and selective soldering applications

Composition and Specifications

The SN100Ce alloy typically contains Tin (Sn) as the base, nickel (Ni) 0.04% to 0.06%, and germanium (Ge) 0.005% to 0.007%. This composition supports optimum wettability and mechanical strength. The melting point is eutectic at approximately 227°C, ensuring smooth integration during top-up and replenishment.

Applications

SN100Ce is specifically designed for use in SN100C solder baths requiring copper dilution. Moreover, it is perfect for electronic assembly processes using wave soldering or selective soldering systems. By maintaining nickel and germanium levels, the SN100Ce lead-free solder alloy ensures stable solder bath performance while reducing defects, dross, and bridging. Consequently, this makes it a trusted choice for manufacturers seeking consistent, high-quality lead-free soldering.

Exclusive Licensed Manufacturer in the UK

DKL Metals Ltd is the exclusive licensed manufacturer of SN100Ce lead-free solder alloy in the UK. Licensed by Nihon Superior Co. Ltd, our production adheres to strict quality controls certified to BS EN ISO 9001:2015. This guarantees every batch of SN100Ce sold meets demanding performance and reliability standards. Choosing DKL Metals for your SN100Ce supply means accessing authentic, premium-quality solder alloy backed by over two decades of licensed expertise.

*Learn About Sn100C From Nihon Superior*

*Check Out Our SN100C!*

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Premium Lead-Free SN100C Solder Bar for Wave & Selective Soldering

SN100C is a premium lead-free solder alloy specifically engineered for high-performance wave and selective soldering applications. As a silver-free alloy, it delivers exceptional solderability and smooth wetting, resulting in bright, reliable solder joints that mimic the appearance of traditional leaded solder. This cost-effective formulation significantly reduces copper erosion and dross formation, ensuring high-quality results without the premium price of silver-bearing alloys. These characteristics make it the industry-leading choice for manufacturers seeking a high-performance SN100C solder bar.

Property	Value	Performance Benefit
Alloy Type	Lead-free, Silver-free	RoHS compliant, reduced material cost
Alloy System	Tin-Copper-Nickel-Germanium (Sn-Cu-Ni-Ge)	Optimised fluidity, strength, and oxidation control
Melting Point	Approx. 227°C – 230°C	Stable, repeatable wave/selective soldering
Joint Appearance	Smooth, bright fillets	Visual quality similar to traditional leaded solder
Process Compatibility	Wave and selective soldering	Ideal for high-volume PCB assembly lines
Application Scope	Automotive, telecoms, consumer, industrial controls	High reliability in demanding environments

Key Features & Benefits for PCB Assembly

RoHS compliant – Superior wetting – Cost-effective performance

• Fully RoHS Compliant: A lead-free solution meeting all environmental and industrial standards.
• Superior Solderability: Smooth wetting properties for clean, reliable joints.
• Silver-Free Formulation: Reduces material costs while maintaining joint integrity.
• Enhanced Reliability: Minimised copper erosion for long-term joint stability.
• Process Versatility: Fully compatible with both wave and selective soldering machines.
• Industry Standard: Ideal for high-volume electronics manufacturing and precision PCB assembly.

Technical Composition & Specifications of SN100C Solder

Stabilised Sn-Cu-Ni-Ge – Eutectic alloy – Reliable performance

The SN100C alloy is a stabilised Tin-Copper-Nickel-Germanium (Sn-Cu-Ni-Ge) eutectic formulation. The addition of Nickel and Germanium optimises fluid flow and mechanical strength while reducing oxidation.

• Melting Point: Eutectic at approximately 227°C – 230°C.
• Joint Appearance: Smooth, bright fillets (unlike the grainy finish of SAC305).
• Operating Stability: Highly reliable for modern, high-density electronics assembly.

Industrial Applications

High-reliability electronics – Demanding environments – Thermal fatigue resistance

SN100C solder bars thrive in demanding commercial and industrial environments, powering critical systems in automotive electronics, telecommunications, consumer goods, and industrial controls. The alloy provides a safer workplace with low smoke and minimal fumes, while its excellent thermal fatigue resistance ensures durability in extreme operating conditions.

UK Exclusive: Licensed SN100C Manufacturer

Authentic SN100C – Licensed manufacture – Proven since 2002

DKL Metals Ltd is the only licensed manufacturer of SN100C solder bar in the UK. While the original patent has expired, we maintain the exclusive rights to the SN100C brand name and the official manufacturing license granted by Nihon Superior Co. Ltd of Japan.

Our partnership, established in 2002, guarantees that every bar produced in our UK facility adheres to the original proprietary formulation and meets rigorous quality benchmarks. By choosing DKL Metals, you are sourcing authentic SN100C backed by decades of metallurgical expertise and quality management systems certified to BS EN ISO 9001:2015.

Quick FAQ: SN100C Solder Bar

What is SN100C and why choose it over SAC305?

SN100C is a silver-free Sn-Cu-Ni-Ge alloy with brighter joints, less copper erosion, and lower cost—ideal for wave soldering. Avoid silver’s volatility and its premium entirely.

Is SN100C fully RoHS compliant?

Yes, it’s lead-free and meets all RoHS, REACH, and ELV standards.

What is the composition of SN100C

SN100C Alloy Specification
Tin (Sn)	Balance
Copper (Cu)	0.60 – 0.70%
Nickel (Ni)	0.04 – 0.06%
Germanium (Ge)	0.005 – 0.01%
MAXIMUM IMPURITY LIMITS
Lead (Pb)	0.05%
Antimony (Sb)	0.05%
Gold (Au)	0.03%
Silver (Ag)	0.05%
Iron (Fe)	0.02%
Zinc (Zn)	0.001%
Aluminium (Al)	0.001%
Arsenic (As)	0.03%
Bismuth (Bi)	0.03%
Cadmium (Cd)	0.002%
Indium (In)	0.03%

What are the minimum order quantities?

20kg for direct from DKL; smaller quantities available via Surclean.

How do I get pricing?

Contact using one of the methods below—a member of our sales team can give you a quote.

In what product formats is SN100C solder available?

SN100C is available in 1kg bars, 2kg and 3.8kg autofeed ingots, chunks, and pellets. We also supply 125g and 250g tinman sticks, as well as blowpipe solder for specialist applications.

Get Expert Support for Your Soldering Process

Partner with the UK’s leading source for technically proven lead-free alloys.

• Read our SN100C FAQ and Technical Guides
• Learn More From Nihon Superior

Ordering Information

For high-volume or commercial requirements (minimum order quantity of 20kg), please contact our sales team directly using the contact buttons below for contract pricing and technical support.
For all small-scale orders or quantities under 20kg, please visit our trusted partner, Surclean Material Technology, who maintains stock for immediate dispatch of SN100C Bar, Chunks, and Solder Pellets.

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