Lead Free Solders

Solder Anodes, Bars, Paint, Wires & Pastes
Lead Free Solders
Dross Reduction
Rosin Fluxes
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Equipment and Materials
  Lead Free
PRODUCT NO
ALLOY COMPOSITION
COMMON REQUREMENTS
SOLIDUS
LIQUIDUS
 
Sn
Pb
Ag
Bi
Cu
Zn
BAR
WIRE
PASTE
PAINT
°C
°C
24
95.5
-
3.8
-
0.7
-
hybrid
-
-
-
-
MP217
25
96
-
2.5
1
0.5
-
hybrid
-
-
-
-
MP222
26
96.5
-
3.5
-
-
-
hybrid
hybrid
-
-
221
221
27
99.3
-
-
-
0.7
-
hybrid
-
-
-
227
227
28
100
-
-
-
-
-
hybrid
-
-
-
-
MP232


LEAD FREE SOLDERS FOR HEALTH AND ENVIORNMENT SAFETY  

Example of some lead-free solders and their properties

LEAD-FREE SOLDER COMPOSITION MELTING POINT RANGE COMMENTS
42 Sn/58 Bi 138°C eutectic Established, availability concern of Bi
91 Sn/9 Zn 199°C eutectic High drossing, corrosion potential
96.5 Sn/3 Ag/0.5 Cu 217°C High strength, good thermal fatigue
95.5 Sn/3.8 Ag/0.7 Cu 217°C High strength, good thermal fatigue
93.5 Sn/3 Sb/2 Bi/1.5 Cu 218°C eutectic High strength, excellent thermal fatigue
95.5 Sn/3.5 Ag/1 Zn 218°C - 221°C High strength, good thermal fatigue
96.5 Sn/3.5 Ag 221°C eutectic High strength and high melting point
95 Sn/5 Ag 221°C - 240°C High strength, good thermal fatigue
96 Sn/4 Ag 221°C High melting point and high strength
97.5 Sn/2.5 Ag 221°C - 226°C High strength, good thermal fatigue
97 Sn/2 Cu/0.8 Sb/0.2 Ag 226°C - 228°C High melting point
99.3 Sn/0.7 Cu 227°C High strength and high melting point
97 Sn/Cu3 227°C - 300°C High melting point and high strength
95 Sn/5 Sb 232°C - 240°C Good shear strength and thermal fatigue
65 Sn/25 Ag/10 Sb 233°C Motorola patent, high strength
96 Sn/4Cu 235°C High melting point and high strength

HEALTH HAZARDS OF LEAD AND PRECAUTIONS TO BE TAKEN

Lead is an accumulative poison, (the body stores it), and exposure over a period of time can result in ill health. Lead may affect the nervous system, the digestive system and other parts of your body. Other effects may include kidney damage, blood pressure, decrease in the number and quality of sperm, and abortion.

Lead enters the body in two main ways: by breathing dusts and fumes into the lungs and by swallowing lead that has contaminated your hands, food or cigarettes. One of the most important things to do when working in a job where one may be exposed to lead is to ensure that one has good personal hygiene.

Steps such as installing exhaust ventilation to remove dust must be taken in preference to providing respirators. Other procedures that may be used to control lead exposure include carrying out the process wet instead of dry, and ensuring that work areas are frequently cleaned using a method such as wet wiping, that does not raise dust. Dry sweeping and compressed air must not be used when cleaning.

The blood lead level indicates how much exposure you have had to lead. Ideally, exposure to lead should be controlled to the point where your blood lead level does not exceed 1.5 mol/litre whole blood.
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