30/70 Tin-Lead Solid Solder Bars
30% Tin | 70% Lead | Wide Working Range
Sold by the pound. Quantity 1 = approximately 1 lb of 30/70 solder (typically 3–4 bars).
Rock Shot Products 30/70 Tin-Lead Solid Solder Bars are manufactured from a nominal alloy containing 30% tin and 70% lead. This traditional tin-lead solder provides good wetting and bonding characteristics with a wide working range, making it well suited for sheet metal work, radiator repair, HVAC applications, tinning, fabrication, maintenance, and general-purpose soldering.
Unlike eutectic solder alloys that transition directly between liquid and solid, 30/70 solder passes through a broad plastic or “pasty” range as it heats and cools. This extended working range can be useful for applications where the solder needs to be worked, shaped, or positioned before completely solidifying.
Each bar is hand-poured into a compact form that is convenient to handle, store, and add to a solder pot or melting vessel.
Product Specifications
Alloy Composition: 30% Tin / 70% Lead
Alloy Type: Tin-Lead Solder
Form: Solid Solder Bar
Sold By: Approximately 1 lb increments
Bars Per Pound: Typically 3–4 bars
Approximate Bar Dimensions: 12" × 3/8" diameter
Approximate Bar Weight: 0.25–0.35 lb
Solidus Temperature: Approximately 361°F (183°C)
Liquidus Temperature: Approximately 496°F (258°C)
Melting Range: Approximately 361°F–496°F (183°C–258°C)
Individual bar dimensions and weights may vary slightly due to the hand-poured casting process. Each quantity purchased represents approximately one pound of solder.
Why Choose 30/70 Solder?
The 30% tin / 70% lead composition has a considerably wider melting range than eutectic 63/37 solder.
Between its solidus and liquidus temperatures, the alloy enters a plastic or pasty state rather than immediately transitioning from liquid to solid. This provides an extended working range that can be advantageous for certain fabrication, repair, tinning, and general soldering operations.
Its relatively high lead content also makes 30/70 an economical choice for applications that do not require a high-tin solder alloy.
Features
- 30% tin / 70% lead composition
- Wide working and solidification range
- Good wetting and bonding characteristics
- Hand-poured solid bar form
- Convenient size for solder pots and melting
- Suitable for commercial, industrial, repair, and hobby applications
Common Applications
- Sheet metal fabrication
- Automotive radiator repair
- HVAC and duct work
- Tinning applications
- Metal fabrication
- General metalworking
- Maintenance and repair
- Solder pots
- Workshop and hobby projects
- Industrial applications
Sold by the Pound
This product is sold in approximately 1 lb increments.
Because individual bars typically weigh approximately 0.25–0.35 lb each, a one-pound order will normally contain 3–4 bars.
Quantity 1 = approximately 1 lb
Quantity 2 = approximately 2 lbs
Quantity 5 = approximately 5 lbs
The exact number of bars may vary depending on individual cast weight.
Need Larger Quantities?
Rock Shot Products supplies tin-lead solder alloys for commercial, industrial, manufacturing, repair, and specialty applications.
If you require larger quantities or recurring supply, contact us for volume pricing and availability.
Rock Shot Products
Rock Shot Products supplies solder bars, casting alloys, specialty metals, and hard-to-find materials for commercial, industrial, and individual customers.
Made in the USA.
Safety Notice: This product contains lead. Wash hands thoroughly after handling and follow applicable workplace, environmental, and safety requirements.
