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Micro-Measurements
Strain Gage Accessories

M-LINE Solders

  M-LINE strain gage solders are listed below, along with their compositions, principal properties, and recommended applications. For ordering purposes, the solders are specified according to a Micro-Measurements coding system. All solders are supplied on spools, except for the 1240-FPA paste which is supplied in a jar.


361A-20R    Best all-around solder for general use. Also capable of use at cryogenic temperatures.

Composition : 63% Tin, 36.65% Lead, 0.35% Antimony
Solidus/Liquidus Temperature : 361°F/361°F (183°C/183°C)
Wetting & Flow : Excellent
Electrical Conductivity : High
Mechanical Strength : Very Good
Corrosion Resistance : Good

  • 25 ft (7.6m) as shown above, right. Order Code 361A-20R-25 .
  • 1 lb (450g) as shown above, left. Order Code 361A-20R .

361-40R    All-around solder for general use. Convenient for instrument work and with heavy leadwires.

Composition : 63% Tin, 37% Lead
Solidus/Liquidus Temperature : 361°F/361°F (183°C/183°C)
Wetting & Flow : Excellent
Electrical Conductivity : High
Mechanical Strength : Very Good
Corrosion Resistance : Good

  • 15 ft (4.6m). Order Code 361-40R-15 .
  • 1 lb (450g). Order Code 361-40R .

430-20S    Recommended for critical work, particularly when electrical conductivity is required. Good mechanical fatigue properties. Do not use at cryogenic temperatures .

Composition : 96% Tin, 4% Silver
Solidus/Liquidus Temperature : 430°F/430°F (221°C/221°C)
Wetting & Flow : Very Good
Electrical Conductivity : High
Mechanical Strength : Very Good
Corrosion Resistance : Excellent

  • 25 ft (7.6m). Order Code 430-20S-25 .
  • 1 lb (450g). Order Code 430-20S .

450-20S    Higher temperature solder with very good handling properties. Supplied in solid form; can be used with either M-Flux AR or M-Flux SS . Presence of antimony prevents "tin disease"; can be used in cryogenic environments, although quite brittle at low temperatures.

Composition : 95% Tin, 5% Antimony
Solidus/Liquidus Temperature : 450°F/460°F (232°C/238°C)
Wetting & Flow : Excellent
Electrical Conductivity : High
Mechanical Strength : Very Good, Hard
Corrosion Resistance : Good

  • 25 ft (7.6m). Order Code 450-20S-25 .
  • 1 lb (450g). Order Code 450-20S .

570-28R    High lead content. For high-temperature connections and long-term cryogenic temperature tests.

Composition : 93.5% Lead, 5% Tin, 1.5% Silver
Solidus/Liquidus Temperature : 565°F/574°F (296°C/301°C)
Wetting & Flow : Very Good
Electrical Conductivity : Fair
Mechanical Strength : Very Good
Corrosion Resistance : Fair

  • 20 ft (6.1m). Order Code 570-28R-20 .
  • 1 lb (450g). Order Code 570-28R .

  1240-FPA     For very high-temperature solder joints, generally with WK-Series gages. The WRS-1 Resistance Soldering Unit is an ideal tool for use with this solder.

Composition : 40% Silver, 28% Zinc, 30% Copper, 2% Nickel
Solidus/Liquidus Temperature : 1220°F/1435°F (660°C/780°C)
Wetting & Flow : Excellent
Electrical Conductivity : High
Mechanical Strength : Excellent
Corrosion Resistance : Good

  • 1 oz (28 g) paste in jar. Order Code 1240-FPA .

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