Sn Ag Cu Solder

Large Image : Sn Ag Cu Solder

Sn-Ag-Cu solder belongs to lead-free products. Unlike the traditional lead solder, it is environmentally friendly and brings much less harm to human beings. Although Tin-silver-copper alloy solders are in more expensive than Sn-Cu solders, they are still widely applied in lead-free automatic wave soldering and other soldering processes because of good wettability and thermal resistance.

Advantages

1. Sn-Ag-Cu solder fulfills demands of RoHS (Restriction of the Use of Certain Hazardous Substances) and REACH (REGULATION Concerning the Registration, Evaluation,Authorization and Restriction of Chemicals).

2. Superior solder flux helps to increase soldering speed and fluidity.

3. Flux is uniformly distributed.

4. Only a little smoke and smells are released.

5. Cracks rarely arise at soldering points. Besides, surface of the Sn-Ag-Cu solder is protected from copper corrosion.

6. Tin-silver-copper alloy solders feature high insulation resistance. With little slag, it is free from cleaning.

Typical Sn-Ag-Cu Solders

92Sn-6Cu -2Ag

95Sn-4Cu -1Ag

99.3Sn-0.7Cu -0.3Ag

Constitutions of Sn-Ag-Cu Solders

Alloy Constitutions	Melting Point℃		Specific Gravity	Applications
Alloy Constitutions	Solidus	Liquidus	Specific Gravity	Applications
92Sn-6Cu -2Ag	217	373	7.50	Hand/Automatic Soldering
95Sn-4Cu -1Ag	217	335	7.40
99.3Sn-0.7Cu -0.3Ag	217	226	7.30

Flux for Sn-Ag-Cu Solders

Code Item	Lc--T-1	Lc--H-1	Lc--P-1	Lc--Hf01	Lc--Ws01
Fluex Content (%)	2.2±1.0	2.5 ± 0.5	2.2 ± 1.0	3.0 ± 0.5	2.5 ± 0.5
Halide Content (%)	0.05--0.1	<0.05	<0.05	0	0.1--0.2
Fluorine Content (%)	None	None	None	None	None
Silver Chromate Test	Pass	Pass	Pass	Pass	Pass
Copper Mirror Test	Pass	Pass	Pass	Pass	Pass
Copper Plate Corrosion Test	Pass	Pass	Pass	Pass	Pass
Sir	>1 × 1011	>1 × 1010	>1×1011	>1 × 1011	>1 × 1011 (After Cleaning)
Electro Migration	Pass	Pass	Pass	Pass	PASS (After Cleaning)
Characteristic	It belongs to halogen-free solder and enjoys wide range of applications.	It is used in soldering nickeling elements and lamp holders.	It is used to solder zinc electrode for capacitors.	It contains little halogen.	Its residue is washable.