Solder flux paste

Name: Solder flux paste
Brand: The Science Hut
SKU: 1005005806764560-B-50g-CHINA-1
Price: 12.95 USD
Availability: InStock

$12.95

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Size 20g Syringe 50g Tub 100g Tub

Product variants

Quantity

Enhance your electronics precision with this rosin-based, no-clean, neutral‑pH solder flux paste, designed to clean and de-oxidize while improving solder flow and joint strength.

Clean, easy solder joints: Removes oxides and protects surfaces for dependable electrical connections.

Neutral pH, non-corrosive: Gentle on components, won’t damage PCB surfaces or nearby wiring.

No-clean residue: Safe to leave behind, or easily wiped with isopropyl alcohol—ideal for most electronics projects.

Works with all solder types: Effective with leaded and lead-free solder—even for SMD and through-hole work.

Precision control with just a small dab—great for kits, component repair, or rework. Goes a long way!

Whether you’re doing PCB assembly, kit building, or troubleshooting microelectronics—GET CLEAN, PROFESSIONAL RESULTS every time. Available in multiple sizes:

20g Syringe — ideal for hobby use. Easy application with the included syringe.
Compact 50g Tub — for people who regularly build electronics kits.
Large 100g Tub — for professionals and students who solder very regularly.

Add it to your workspace today! Refer to sections below for further product information.

What's Included?

20g, 50g, or 100g of solder flux paste, depending on option selected.

Frequently Asked Questions (FAQ)

Q: What is soldering flux used for?

A: Flux is used to clean and prepare metal surfaces during soldering. It removes oxidation, improves solder flow, and helps create strong, reliable joints — especially in electronics work.

Q: Can this flux be used for electronics?

A: Yes, this flux is designed for precision electronics soldering, including PCB repair, SMD work, and reflow applications.

Q: How do I apply the flux?

A: Apply a small amount directly to the joint area—a plastic syringe is ideal for this, but a spatula or Q-tip will also work fine. Then heat the joint with a soldering iron or hot air tool. Flux is especially helpful before reflow or when reworking bad solder joints.

Q: Do I need to clean off this flux after soldering?

A: This is a no-clean flux, meaning residue does not need to be removed for most hobby or light commercial work. If desired, clean with isopropyl alcohol and a soft brush or lint-free cloth.

Q: Is this flux lead-free compatible?

A: Yes, this flux is compatible with both lead-free and leaded solder. It helps improve flow and bonding regardless of solder type.

Q: What’s the shelf life of this flux?

A: Flux typically lasts 12–24 months if kept sealed in a cool, dry place. Avoid heat and sunlight to maintain effectiveness.

Q: How far will this flux go?

A: Only a tiny amount (e.g.: < 0.01g) is used for each soldering joint. Based on this, you can expect around 1000 solder joints per gram of flux paste.

20g: 2,000 joints
50g: 5,000 joints
100g: 10,000 joints

Product Specifications

Composition: Rosin (Type R).
Appearance: Yellow paste.
Melting point: 70-100ºC.
Non-corrosive, pH (6.8 to 7.4).
Resistivity: >10⁸ Ω/cm (no clean).
Shelf-life: 12-24 months after opening, store in the shade.

Links and References

Read our blog posts related to electronics tools:

Shipping and Warranty Info

Shipping Information

Orders are processed for dispatch within 1–2 business days. Typical delivery times following dispatch for this product, depending on region are:

US: 5-8 days (Orders are shipping as usual. The U.S. government shutdown isn’t causing any delays.)
UK: 5-8 days
EU: 6-13 days
Canada: 7-14 days
Australia: 7-14 days

All orders are shipped with tracking, where available. Please refer to our Shipping Policy page for further detail.

Warranty & Satisfaction Guarantee

All products come with a 14-day satisfaction guarantee. If you're not happy with your purchase, contact us and we’ll arrange a refund or replacement — no hassle. Please note that to qualify for a replacement or refund, products must be in their original, unused condition. Please refer to our Returns and Refunds policy for more information.

Packaging

We aim to minimize waste while protecting your order. All products are securely packaged in padded or bubble-wrapped, waterproof mailing bags. Depending on the item, they may also be enclosed in plastic or cardboard boxes (suitable for gift-wrapping) to ensure protection. Where boxes are not necessary (e.g., basic electronics tools and materials), items are shipped in bubble-wrapped mailing bags without additional boxing.

Ships from: International Warehouse

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Good material

Fantastic value for the price, this tub will last me for months. Makes soldering a breeze. Flux core solder isn't always the best option, sometimes you need a bit more control and this paste does the job perfectly. Great surface tension properties, pulls all the solder together into a neat little blob, making it very easy to work with.