Looks like somebody is selling cheap solder here;
http://detroit.Craigslist.org/okl/tls/3755076901.html
The compound symbol for solder can vary depending on the specific composition. Common solder compounds include tin-lead solder (Sn-Pb) and lead-free solder such as tin-silver-copper (Sn-Ag-Cu) or tin-copper (Sn-Cu).
Any "LEAD FREE"
Lead is toxic to humans (causes brain damage) thus when using a solder to join copper water pipes it is best not to use a solder containing lead as this will get into the water passing through the pipes and slowly poison the user of this water.
Yes many types depending on application and lead free alloys as solder by definition means lead. Solder such as 40 - 60 50 -50 60- 40
You can purchase a lead free solder on Amazon, an online marketplace that sells pretty much anything you can imagine. The price for one on Amazon is very cheap and you can get free shipping on the item as well.
Lead free only
To solder a brass closet flange to a lead bend, ensure both surfaces are clean and free of debris. Apply flux to the joint area, heat the brass flange and lead bend with a propane torch until the brass reaches solder melting temperature, then apply lead-free solder around the joint. Allow the solder to cool and solidify before testing the connection for leaks.
Lead-free solder began to be widely used in the electronics industry in the early 2000s, following regulations such as the European Union's Restriction of Hazardous Substances (RoHS) directive which restricted the use of lead in electronic devices.
For copper pipe, lead-free solder is recommended to ensure safe and effective connections.
Most commonly, but antimony is another basic component of some solders. The European Union, China, and California are areas where lead solder is banned in consumer products. Tin-lead solders were most often used because they are easily melted and inexpensive. Lead-based solders have a few problems which are reducing their popularity: - Environmental concerns about e-waste - Worker safety concerns for people who constantly work with solder - The low melting point, which is not suitable for modern microprocessors Any metal which is melted to bond to another metal is a solder. Silver solder is used to repair silver jewelry, and gold solder to repair gold. Silver solder is also used in food-grade plumbing. Drinking water is soldered with lead-free solder (but lead was used in nearly all plumbing soldering until the late 1980s).
An example of solder is lead-tin solder, which typically consists of a mixture of 60% tin and 40% lead. This type of solder is commonly used in electronics to join components on circuit boards due to its excellent conductivity and low melting point. However, due to health concerns regarding lead, lead-free solder alternatives, such as tin-copper or tin-silver, are increasingly used in various applications.
For sweating fittings used in water heater installation, lead-free solder is best to ensure safety and compliance with regulations. Look for solder that is specifically designed for potable water systems to ensure durability and long-lasting joints. Be sure to follow manufacturer instructions and best practices for proper installation.