XPost: sci.physics   
   From: PointedEars@web.de   
      
   Ho Li Phuc wrote:   
   > On 2/26/2026 10:58 PM, Jan Panteltje wrote:   
   >>> Thomas 'PointedEars' Lahn wrote:   
   >>>> Ho Li Phuc wrote:   
   >>>> I am reminded of a statistically high number of horses suffering from   
   >>>> lead poisoning on ranches surrounding a gasoline refinery in the Bay   
   >>>> Area in Northern California that produced leaded gasoline for   
   >>>> automobiles back in the 20th century.  The findings resulted in a ban on   
   >>>> leaded gasoline in the United States.   
   >>>   
   >>> Interesting.  However, the idea of this ban was probably not only to   
   protect   
   >>> horses.  Lead, a heavy metal, is poisonous for almost all life, certainly   
   >>> humans.  So it makes a lot of sense to avoid any chance of it getting in   
   the   
   >>> air and ground water, for example.   
   >>>   
   >>> Similar regulations exist outside the USA, at the latest since the end of   
   >>> the 1990s.   
   >>>   
   >>>    
   >>   
   >> :-)   
   >> I have been working with 60/40 solder (lead/tin) as a kid since the early   
   fifties.   
   >> Almost 80 now, still using it:   
   >>   https://panteltje.nl/pub/soldering_iron_tip_cleaning_IMG_6610.JPG   
      
   Lead poisoning in combination with old age might explain your mindbogglingly   
   stupid behavior, such as crossposting without Followup-To, as well as your   
   other stupid claims :->   
      
      
      
   "Tin-lead (Sn-Pb) solders, also called soft solders, are commercially   
   available with tin concentrations between 5% and 70% by weight. The greater   
   the tin concentration, the greater the solder's tensile and shear strengths.   
   Lead mitigates the formation of tin whiskers,[7] though the precise   
   mechanism for this is unknown.[8] Today, many techniques are used to   
   mitigate the problem, including changes to the annealing process (heating   
   and cooling), addition of elements like copper and nickel, and the   
   application of conformal coatings.[9] Alloys commonly used for electrical   
   soldering are 60/40 Sn-Pb, which melts at 188 °C (370 °F),[10] and 63/37   
   Sn-Pb used principally in electrical/electronic work. The latter mixture is   
   a eutectic alloy of these metals, which:   
      
     1. has the lowest melting point (183 °C or 361 °F) of all the tin-lead   
        alloys; and   
     2. the melting point is truly a point — not a range.   
      
   In the United States, since 1974, lead is prohibited in solder and flux in   
   plumbing applications for drinking water use, per the Safe Drinking Water   
   Act.[11] Historically, a higher proportion of lead was used, commonly 50/50.   
   This had the advantage of making the alloy solidify more slowly. With the   
   pipes being physically fitted together before soldering, the solder could be   
   wiped over the joint to ensure water tightness. Although lead water pipes   
   were displaced by copper when the significance of lead poisoning began to be   
   fully appreciated, lead solder was still used until the 1980s because it was   
   thought that the amount of lead that could leach into water from the solder   
   was negligible from a properly soldered joint. The electrochemical couple of   
   copper and lead promotes corrosion of the lead and tin. Tin, however, is   
   protected by insoluble oxide. Since even small amounts of lead have been   
   found detrimental to health as a potent neurotoxin,[12] lead in plumbing   
   solder was replaced by silver (food-grade applications) or antimony, with   
   copper often added, and the proportion of tin was increased (see lead-free   
   solder)."   
      
   --   
   PointedEars   
      
   Twitter: @PointedEars2   
   Please do not cc me. / Bitte keine Kopien per E-Mail.   
      
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