STIRRI SW-993-N08-100 Clean Lead Eutectic Solder Wire LF-993 SN99.3CU0.7-0.8 0.031 2.5

( Brand: Stirri ), ( Manufacturer Part Number: SW-993-N08-100 ), ( Part Type: Solder ), ( Size: 0.8 Mm / 0.031 ), ( Style: No-clean Core ), ( Material: Metal ), ( Package Dimensions Lxwxh: 2.0x2.0x1.0 Inches )

Review STIRRI Sn99.3cu0.7-0.8mm 0.031 Inch No clean Lead free Eutectic Solder Wire 2.5

The **Stirri SW-993-N08-100 LF-993 Sn99.3Cu0.7 solder wire (0.8mm diameter, 0.031-inch thickness, no-clean, lead-free, eutectic composition)** is a high-performance, precision-engineered soldering solution designed for professionals and hobbyists who demand reliability, consistency, and environmental compliance in their electronics assembly processes. This solder wire is formulated with a **lead-free eutectic alloy of 99.3% tin (Sn) and 0.7% copper (Cu)**, adhering to stringent industry standards such as **RoHS (Restriction of Hazardous Substances)** and **REACH**, making it an ideal choice for modern manufacturing where toxicity reduction is a priority. The **eutectic composition** ensures a low melting point of approximately **217 C (423 F)**, optimizing heat efficiency and minimizing thermal stress on sensitive components during soldering, which is particularly advantageous for delicate PCBs, BGA packages, and high-density interconnects.

The **no-clean flux core** of this solder wire eliminates the need for post-soldering flux residue removal, streamlining the assembly process and reducing labor costs. Unlike traditional flux systems that require harsh cleaning agents, this flux leaves behind a minimal, non-conductive residue that does not compromise electrical performance or require additional cleaning steps, making it well-suited for automated and semi-automated production lines as well as manual soldering applications. Its **smooth, uniform flow** ensures consistent wetting and bonding, reducing the risk of cold solder joints, bridging, or insufficient adhesion common issues that can lead to reliability failures in finished products.

With a **diameter of 0.8mm (0.031 inches)**, this solder wire strikes an optimal balance between precision and usability, making it versatile for a wide range of soldering tasks, from fine-pitch SMD components to larger through-hole connections. The **fine, even diameter** ensures consistent feed through soldering irons and wave soldering machines, while its **flexible yet sturdy construction** prevents breakage during handling, even in high-volume or repetitive soldering environments. The **silver-plated copper core** enhances thermal conductivity, allowing for faster heat transfer and more efficient soldering, which is especially beneficial when working with heat-sensitive materials or in applications requiring rapid cycle times.

Beyond its technical advantages, this solder wire is engineered for **long-term reliability and storage stability**. The flux formulation is designed to remain active for extended periods without drying out or degrading, even in varying environmental conditions, ensuring consistent performance whether stored in a controlled workshop or a warehouse. Additionally, its **lead-free composition** not only complies with global regulatory requirements but also mitigates health and safety risks associated with traditional tin-lead alloys, making it a safer choice for operators and end-users alike. Whether used in prototyping, mass production, or repair work, the **Stirri SW-993-N08-100** solder wire delivers a seamless, efficient, and environmentally responsible soldering experience, setting a new standard for quality and performance in electronics assembly.

### **Pros and Cons of buying a Stirri SW-993-N08-100 (LF-993, Sn99.3Cu0.7, 0.8mm, 0.031" No-Clean Lead-Free Eutectic Solder Wire)**

1. **Lead-Free Compliance** Meets RoHS (Restriction of Hazardous Substances) regulations, making it suitable for electronics manufacturing in regions with strict environmental laws (e.g., EU, California).

2. **Eutectic Alloy (Sn99.3Cu0.7)** Provides a lower melting point ( 217 C) compared to traditional tin-lead solders, reducing thermal stress on components and improving joint reliability.

3. **No-Clean Flux** Eliminates the need for post-soldering cleaning, simplifying the reflow process and reducing waste.

4. **Fine Diameter (0.8mm / 0.031")** Ideal for fine-pitch soldering, wave soldering, and selective soldering applications, ensuring precise wetting and minimal excess solder.

5. **Consistent Performance** High-quality solder wire from Stirri (a reputable brand) ensures uniform composition, reducing defects like cold solder joints or bridging.

6. **Versatility** Works well in both manual soldering and automated processes, including reflow ovens and soldering machines.

7. **Corrosion Resistance** Lead-free solders generally offer better long-term reliability in humid or corrosive environments compared to traditional tin-lead alloys.

8. **Cost-Effective for Large-Scale Use** While slightly more expensive than leaded solder, the benefits in compliance and reliability can justify the cost in industrial applications.

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1. **Higher Cost** Lead-free solders are typically more expensive than traditional tin-lead alloys (e.g., Sn63Pb37), which may increase material costs in production.

2. **Higher Melting Point** Requires more precise temperature control in soldering processes, as overheating can lead to component damage or flux breakdown.

3. **Potential for Oxide Formation** Lead-free solders are more prone to oxidation, which can affect wetting and joint strength if not handled properly (e.g., using flux effectively or in a controlled atmosphere).

4. **Limited Compatibility with Some Materials** Certain metals (e.g., copper with high oxygen content) may require additional surface treatments to ensure proper adhesion.

5. **Solder Joint Durability Concerns** Some studies suggest that lead-free solders may have slightly lower fatigue resistance compared to tin-lead alloys, though this is often mitigated by proper alloy selection and process optimization.

6. **Learning Curve for Operators** Workers accustomed to tin-lead solder may need training to adjust to the different handling properties of lead-free solder (e.g., faster wetting but shorter shelf life).

7. **Flux Residue Issues** While "no-clean," some no-clean fluxes may still require inspection for excessive residue, which could affect reliability if not managed properly.

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The **Stirri SW-993-N08-100 (Sn99.3Cu0.7, 0.8mm no-clean lead-free solder wire)** is a well-suited choice for applications requiring **RoHS compliance, fine-pitch soldering, or automated production**. Its **eutectic composition, no-clean flux, and consistent quality** make it reliable for both manual and industrial use. However, the **higher cost, stricter temperature control requirements, and potential oxidation challenges** must be considered, especially in cost-sensitive or high-volume manufacturing.

For **small-scale hobbyists or prototyping**, the cost may not be justified unless compliance is mandatory. For **commercial or industrial electronics manufacturing**, the benefits in **reliability, environmental compliance, and process efficiency** often outweigh the drawbacks.

- You need **RoHS-compliant solder** for regulatory or environmental reasons.

- You are working with **fine-pitch components** or require precise soldering (e.g., BGA, QFN packages).

- You prefer **no-clean flux** to simplify post-soldering cleanup.

- You have **proper temperature control** in your soldering process (e.g., reflow oven, soldering iron with thermal management).

- You are on a **tight budget** and can use leaded solder (e.g., Sn63Pb37) for non-compliant projects.

- Your process lacks **precise temperature control**, risking component damage.

- You are dealing with **highly sensitive or large-scale production** where cost savings are critical, and you can source cheaper alternatives (e.g., generic lead-free solder).

For most **professional or compliance-driven applications**, this solder wire is a **strong recommendation**. For hobbyists or cost-sensitive projects, evaluate whether the benefits justify the expense.

Details:

The 0.7% copper content improves mechanical properties, making it perfect for demanding environments where reliability is crucial. It also promotes better wetting characteristics, increases resistance to corrosion, and improves adhesion surfaces. The copper content improves mechanical properties, enhancing joint reliability and reducing the risk of thermal fatigue. The lower eutectic melting point makes it easier to work with, and solidifying is approximately 227 C, making this wire suitable for lead-free temperature profiles designed industrial-optimal performance.

Quality Assurance Manufactured under strict quality control standards, you can trust that our solder wire will deliver consistent results every time. Its composition facilitates better control over the manufacturing process, ensuring consistent quality in solder joint, Alloy Composition: Made of 99.3% Tin Sn and 0.7% Copper Cu, this alloy combines strength with excellent thermal cycling capabilities. Convenient small spools for quick practical use. Superior Strength With its unique composition, this solder wire provides enhanced joint strength and durability.

Exhibits excellent thermal and electrical conductivity, making it well-suited for industrial electronic applications. The addition of copper enhances strength and ductility, making it an ideal choice for demanding environments. Its lower melting point allows for quicker soldering times, increasing efficiency without compromising quality. LIQ and SOL temperature range as per IPC J-STD-006B, No-Clean Flux Core: Contains 3.3% rosin-based no-clean flux core for excellent wetting, minimal residue, ease of use, ensuring clean efficient soldering.

specifications weldtoolsam:

• brand: Stirri
• mpn: Sw-993-n08-100
• part type: Solder
• size: 0.8 Mm / 0.031
• style: No-clean Core
• material: Metal
• package dimensions lxwxh: 2.0x2.0x1.0 Inches

general weldtoolsam:

• Tools Workshop Equipment > Power Tools > Welding Soldering Tools
• condition: New

offer weldtoolsam:

• options: Ship-to-home
• started: February 2, 2026
• availability: In Stock
• sold: 0
• quantity: 1

seller weldtoolsam:

• city: Cypress, California
• rating: 100.0%
• # reviews: 50

payments weldtoolsam:

• wallet: Google-pay
• credit card: Visa
• other

returns weldtoolsam:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted
• method: Money back

shipping weldtoolsam:

• service: USPS First Class Letter
• carrier: USPS
• type: Fixed
• cost: $0.00
• transit: 5-9 Days
• class: Standard