--- product_id: 523606163 title: "Delcast 4-Pack Rosin Paste Soldering Flux for Electronics Circuit Boards and Copper Electrical Wire" brand: "delcast" price: "€ 21.62" currency: EUR in_stock: true reviews_count: 8 category: "Delcast" url: https://www.desertcart.hr/products/523606163-delcast-4-pack-rosin-paste-soldering-flux-for-electronics-circuit store_origin: HR region: Croatia --- # Improves solder flow for precision Speeds up soldering process efficiently Prevents corrosion with protective coating Delcast 4-Pack Rosin Paste Soldering Flux for Electronics Circuit Boards and Copper Electrical Wire **Brand:** delcast **Price:** € 21.62 **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Master your solder game with Delcast’s unstoppable rosin flux! ## Quick Answers - **What is this?** Delcast 4-Pack Rosin Paste Soldering Flux for Electronics Circuit Boards and Copper Electrical Wire by delcast - **How much does it cost?** € 21.62 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/523606163-delcast-4-pack-rosin-paste-soldering-flux-for-electronics-circuit) ## Best For - delcast enthusiasts ## Why This Product - Trusted delcast brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Compact 4-Pack:** Conveniently sized for easy storage and continuous workflow - β€’ **Corrosion Defense:** Protects connections for long-lasting durability - β€’ **Rapid Heat Transfer:** Cuts soldering time, boosting your productivity - β€’ **Pro-Grade Versatility:** Ideal for electronics pros and DIY innovators alike - β€’ **Precision Flow Control:** Ensures accurate, clean solder joints every time ## Overview Delcast 4-Pack Rosin Paste Soldering Flux is a professional-grade formula designed to enhance solder flow, speed up your workflow, and create strong, corrosion-resistant electrical bonds. Perfect for electronics technicians and DIYers, this 4-pack offers over 1oz per container of thick, reliable flux that ensures precision and durability in every connection. ## Description Delcast Rosin Soldering Flux Paste is a high-quality conductive material that improves the flow of solder and enhances the reliability of soldered connections. Its unique formulation facilitates the soldering process, making it more efficient and faster. The product's rosin-based formula removes oxides and other contaminants from surfaces being soldered, creating strong mechanical and electrical bonds that will last for years to come. Delcast Rosin Soldering Flux Paste is versatile and ideal for a range of soldering applications, whether you're a professional electronics technician or a DIY enthusiast. Review: Soldering paste - Soldering paste works very well, works great. Can recommend. Thanks Review: Dense consistency, quality seems good. - Rosin Soldering Flux Paste 50G arrived quickly from CMT and the paste was of very thick consistency. It arrived in an opaque white container instead of the translucent package in the photo. Color of the flux is darker than what appears in the photo, but it could be due to the different opaque container and photo lighting. One reviewer claimed it wasn't actual rosin and I disagree, but maybe they've updated the product. The seller followed up well after I received the product and expressed sincere interest in my satisfaction. Based on this ambitious behavior I would not be surprised if they are attentive to feedback. Before knowing better, I've used water based flux on some electronic projects. DON'T DO IT! Unless maybe you're in a true pinch and can guarantee returning to rework the job, but, even still, it's a bad idea. Incorrect flux must be thoroughly cleaned, and the chance of missing some or forgetting where it was used is not worth the risk. The cost of rework is threefold and doesn't include the mental anguish of doubting integrity. Do it right and get the right stuff. For years I've counted on the flux built into rosin-core solder, but, as my skillset improves and scope of work widens, the need has overcome the "want". Additional solder is a Godsend with terminal connections, rework, salvaging components, and conserving solder when running the iron for multiple connections. The flux, among its other functions, allows heat to flow and solder follows suite. Heat flow is especially useful when soldering small terminals with an iron instead of flame. Without flux (dry) the iron needs to be in contact for a much longer time; the heat transfer is slower than the dissipation; you end up melting wire insulation and taking an eternity to solder connections. For rework and salvage, faster and more direct heat transfer helps to get in and out without burning up the component you are pulling as well as the surrounding components; this is also good for virgin work, but rosin-core solder usually does the job. However for tasks that require leaving an iron on between multiple connections, the solder sits on the tip between tasks and the flux eventually burns off. Later, when you're ready for the iron again, rather than cleaning off the tip and reapplying solder, you can apply some rosin flux directly to the connection and simply use the solder that is already on the tip. I used this flux immediately for a 1/0 battery terminal lug and time will tell how well it holds up, but I am confident it will protect protect it well. If something changes, then I will update this review. ## Features - Improves solder flow for accurate and controlled soldering - Facilitates the soldering process, making it faster and more efficient - Creates strong mechanical and electrical bonds for long-lasting connections - Prevents corrosion with its protective coating over the solder joint - Conveniently packaged with over 1oz net weight for easy storage and handling during soldering ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BV5BT6XM | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #147,240 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #138 in Soldering Flux | | Customer Reviews | 4.6 4.6 out of 5 stars (2,894) | | Date First Available | February 8, 2023 | | Item Package Quantity | 4 | | Item Weight | 6.1 ounces | | Item model number | FLX-50G-4PK | | Manufacturer | Delcast | | Material | tile | | Package Dimensions | 6 x 5 x 1 inches | | Part Number | FLX-50G-4PK | ## Images ![Delcast 4-Pack Rosin Paste Soldering Flux for Electronics Circuit Boards and Copper Electrical Wire - Image 1](https://m.media-amazon.com/images/I/61Y494x8BFL.jpg) ![Delcast 4-Pack Rosin Paste Soldering Flux for Electronics Circuit Boards and Copper Electrical Wire - Image 2](https://m.media-amazon.com/images/I/61QZjTXAg5L.jpg) ![Delcast 4-Pack Rosin Paste Soldering Flux for Electronics Circuit Boards and Copper Electrical Wire - Image 3](https://m.media-amazon.com/images/I/617hLx5jNoL.jpg) ## Available Options This product comes in different **Item Package Quantity** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Soldering paste *by M***E on October 4, 2025* Soldering paste works very well, works great. Can recommend. Thanks ### ⭐⭐⭐⭐⭐ Dense consistency, quality seems good. *by J***N on January 30, 2018* Rosin Soldering Flux Paste 50G arrived quickly from CMT and the paste was of very thick consistency. It arrived in an opaque white container instead of the translucent package in the photo. Color of the flux is darker than what appears in the photo, but it could be due to the different opaque container and photo lighting. One reviewer claimed it wasn't actual rosin and I disagree, but maybe they've updated the product. The seller followed up well after I received the product and expressed sincere interest in my satisfaction. Based on this ambitious behavior I would not be surprised if they are attentive to feedback. Before knowing better, I've used water based flux on some electronic projects. DON'T DO IT! Unless maybe you're in a true pinch and can guarantee returning to rework the job, but, even still, it's a bad idea. Incorrect flux must be thoroughly cleaned, and the chance of missing some or forgetting where it was used is not worth the risk. The cost of rework is threefold and doesn't include the mental anguish of doubting integrity. Do it right and get the right stuff. For years I've counted on the flux built into rosin-core solder, but, as my skillset improves and scope of work widens, the need has overcome the "want". Additional solder is a Godsend with terminal connections, rework, salvaging components, and conserving solder when running the iron for multiple connections. The flux, among its other functions, allows heat to flow and solder follows suite. Heat flow is especially useful when soldering small terminals with an iron instead of flame. Without flux (dry) the iron needs to be in contact for a much longer time; the heat transfer is slower than the dissipation; you end up melting wire insulation and taking an eternity to solder connections. For rework and salvage, faster and more direct heat transfer helps to get in and out without burning up the component you are pulling as well as the surrounding components; this is also good for virgin work, but rosin-core solder usually does the job. However for tasks that require leaving an iron on between multiple connections, the solder sits on the tip between tasks and the flux eventually burns off. Later, when you're ready for the iron again, rather than cleaning off the tip and reapplying solder, you can apply some rosin flux directly to the connection and simply use the solder that is already on the tip. I used this flux immediately for a 1/0 battery terminal lug and time will tell how well it holds up, but I am confident it will protect protect it well. If something changes, then I will update this review. ### ⭐⭐⭐⭐ Works well. No MSDS *by R***. on April 8, 2019* I purchased this flux for small infrequent jobs at work but because I can not seem to find a MSDS sheet, it is not allowed. However, it does seem to be a very good flux for those occasions where you don't want a really aggressive flux. I would buy it again if needed. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/523606163-delcast-4-pack-rosin-paste-soldering-flux-for-electronics-circuit](https://www.desertcart.hr/products/523606163-delcast-4-pack-rosin-paste-soldering-flux-for-electronics-circuit) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-17*