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

Chemical composition

Standard	Fe, %	Sn, %	Bi, %	Cu, %	Al, %	Pb, %	Cd, %
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

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Physical characteristics

Temperature, °C	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
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
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
Rolling	Standard	Classifiers	Value, HBW
Wire	GOST 21930-76		13.8–14

Casting and technological parameters

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

Analogues

Russia
Russia
Припой ПОССу25-2

Standards

Standard	Description
Standard	Description
GOST 21930-76

Description of chemical elements

Element	Units of measurement	Description
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
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
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
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