Tin-lead solder 25C

It is used for tinning and soldering of electric and radio equipment, printed circuits, precision instruments with high-tight seams

Classification

Country Section Category
CIS, Russia, Ukraine Tin, lead, babity Lead antimony alloys

Chemical composition

Standard Fe, % Sn, % Bi, % Cu, % Al, % Pb, % Cd, %
GOST 21930-76 < 0.02 24.5–25.5 < 0.1 < 0.05 < 0.001 74.328–75.5 < 0.001

Information on suppliers

Physical characteristics

Temperature, °C $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20 0.092 8900 0.145

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\sigma_{Y}$$, $$MPa$$ d5, % Treatment
Wire GOST 21930-76 3.6 2.8 35–40

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Wire GOST 21930-76 13.8–14

Casting and technological parameters

melting point, solidus, °C melting point, liquidus, °C
140–145 155–160

Analogues

Russia
Припой ПОССу25-2

Standards

Standard Description
GOST 21930-76

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Sn % Tin
Bi % Bismuth
Cu % Copper
Al % Aluminium
Pb % Lead
Cd % Cadmium

Description of physical characteristics

Parameter Units of measurement Description
$$\varkappa$$ $$\frac{W}{m\cdot K}$$ Coefficient of thermal conductivity (the heat capacity of the material)
$$\rho$$ $$\frac{kg}{m^3}$$ The density of the material
$$R\cdot 10^{-6}$$ $$\Omega\cdot m$$ Electrical resistivity

Description of mechanical properties

Parameter Units of measurement Description
d5 % Elongation at break
$$\sigma_{Y}$$ $$MPa$$ Yield strength
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength

Description of the casting and technological parameters

Parameter Units of measurement Description
melting point, solidus °C The temperature at which melts the low melting component
melting point, liquidus °C The temperature at which equilibrium falls first crystal