Lead-free solder paste must be better than lead solder paste?
Article Source: Huizhou Electroloy Technology Co., Ltd.Popularity:6428issuing time:2017-12-30 17:02:23【SML】
We
want to understand this problem must first understand the difference
between the two, there is a clear distinction between the lead solder
paste and lead-free solder paste name, that is, whether lead. In
fact, both contain lead, but lead-free solder paste lead content does
not exceed 1000PPM, that is, the content does not exceed 0.1%. Lead solder paste and its highest tin content is 63% of 6337 solder paste.
The
reason for this distinction is that the RoHS standard, a compulsory
standard enacted by the EU legislation that came into effect on July 1,
2006, states that the materials and process standards used to regulate
electrical and electronic products are more favorable Human health and environmental protection. The
purpose of this standard is to eliminate lead, mercury, cadmium,
hexavalent chromium, polybrominated biphenyls and polybrominated
diphenyl ethers in electrical and electronic products (Note: the correct
Chinese name for PBDE refers to PBDE and PBDE are incorrect) ) A total of six substances, and the key provisions of the lead content can not exceed 0.1%. So in many of the products exported electronic products will use lead-free solder paste.
Lead
is the difference between the composition, in fact, lead-free solder
paste in addition to lead-free solder will be added in the solder paste
other ingredients, such as silver, copper, bismuth and other metals. Joined a different metal solder paste has made a different performance characteristics. Lead solder paste is mostly tin-lead ratio, there are some added silver solder paste to increase conductivity. As the metal composition of different solder paste melting
point performance is also different, such as lead-free solder paste is
divided into low temperature, temperature, high temperature three, the
melting point ranging from 138-227 ℃.
The melting point of lead solder paste are generally about 183 ℃ position. In terms of solderability, lead solder paste solder gloss will be better, the solder joints will be more bright. Solder firmness is better than some lead-free solder paste. From the price point of view, because the price of lead is cheaper than tin, let alone silver, copper these metals. Therefore, the price of lead solder paste is much cheaper than lead-free solder paste.
All solder paste has both advantages and disadvantages. Lead-free solder paste is your best choice if ROSH needs to be met. Only in the meet ROSH standards several solder paste to choose from. In the absence of ROSH standard conditions, it is necessary from a practical point of view. Not only to consider the melting point of solder paste and product suitability, but also consider the price and other factors. Under normal circumstances, if there are lead-free solder paste
and lead-free solder paste to meet the conditions are still better
choice of solder paste, not only reduce the composition, the welding
effect will not be poor.
We
want to understand this problem must first understand the difference
between the two, there is a clear distinction between the lead solder
paste and lead-free solder paste name, that is, whether lead. In
fact, both contain lead, but lead-free solder paste lead content does
not exceed 1000PPM, that is, the content does not exceed 0.1%. Lead solder paste and its highest tin content is 63% of 6337 solder paste.
The
reason for this distinction is that the RoHS standard, a compulsory
standard enacted by the EU legislation that came into effect on July 1,
2006, states that the materials and process standards used to regulate
electrical and electronic products are more favorable Human health and environmental protection. The
purpose of this standard is to eliminate lead, mercury, cadmium,
hexavalent chromium, polybrominated biphenyls and polybrominated
diphenyl ethers in electrical and electronic products (Note: the correct
Chinese name for PBDE refers to PBDE and PBDE are incorrect) ) A total of six substances, and the key provisions of the lead content can not exceed 0.1%. So in many of the products exported electronic products will use lead-free solder paste.
Lead
is the difference between the composition, in fact, lead-free solder
paste in addition to lead-free solder will be added in the solder paste
other ingredients, such as silver, copper, bismuth and other metals. Joined a different metal solder paste has made a different performance characteristics. Lead solder paste is mostly tin-lead ratio, there are some added silver solder paste to increase conductivity. As the metal composition of different solder paste melting
point performance is also different, such as lead-free solder paste is
divided into low temperature, temperature, high temperature three, the
melting point ranging from 138-227 ℃.
The melting point of lead solder paste are generally about 183 ℃ position. In terms of solderability, lead solder paste solder gloss will be better, the solder joints will be more bright. Solder firmness is better than some lead-free solder paste. From the price point of view, because the price of lead is cheaper than tin, let alone silver, copper these metals. Therefore, the price of lead solder paste is much cheaper than lead-free solder paste.
All solder paste has both advantages and disadvantages. Lead-free solder paste is your best choice if ROSH needs to be met. Only in the meet ROSH standards several solder paste to choose from. In the absence of ROSH standard conditions, it is necessary from a practical point of view. Not only to consider the melting point of solder paste and product suitability, but also consider the price and other factors. Under
normal circumstances, if there are lead-free solder paste and lead-free
solder paste to meet the conditions are still better choice of solder
paste, not only reduce the composition, the welding effect will not be
poor.
