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 |
- |
|
- |
- |
- |
- |
MP217 |
25 |
96 |
- |
2.5 |
1 |
0.5 |
- |
|
- |
- |
- |
- |
MP222 |
26 |
96.5 |
- |
3.5 |
- |
- |
- |
|
|
- |
- |
221 |
221 |
27 |
99.3 |
- |
- |
- |
0.7 |
- |
|
- |
- |
- |
227 |
227 |
28 |
100 |
- |
- |
- |
- |
- |
|
- |
- |
- |
- |
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.
FOR TECHNICAL BULLITIN / MSDS CLICK HERE
