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Q: Is there a chart somewhere that says when/what to use 60/40 for and when to use 63-37 instead?

the lower temp 63-37 is more prone to cracking although rarely is an issue. 60-40 is best if you are not concerned with the temp difference

Q: I just received this solder and nowhere on the packaging does it indicate a rosin core. Directions also say to add flux, Is it in fact Rosin Core?.

If the roll of solder you received from this page does not say: "44" ROSIN CORE - on the right side, in the yellow stripe, then it is not the solder you paid for. I am 66 years old, learned to solder electronic components by having to complete a full 16 hour course during my electronics training in the USAF back when I had just hit 18. ALL the solder provided to work on the aviation and aerospace gear I dealt with while in service was Kester "44" with 60/40 ratio. PERIOD. I still have a few empty spools from back then. The only difference is they were metal spools back then, and the label was a paint-printed like a soda can. BUT the label looked the same (1971-75) then as it does now. It quite definitely says that is it rosin cored. If the label is missing (can happen these days with printed paper labels and plastic spools that don't accept glue well) you can test for rosin core by cutting off some of the tip (to remove the seal your solder iron left there) and if you then heat the solder with an under-temp iron, the rosin should "bubble" out the open end before the lead/tin melts.

Q: does anyone know how many meters does this comes with?

The length is approximately between 380 to 400 feet or 115.8 to 121.9 meters per pound.

Q: Would you use this solder for audio kit circuit boards like the wave "http://www.amazon.com/wave-analog-driven-spring-reverb/dp/b00r8jfblo/ref=sr_1_1"

Kester SN60-/PB40 solder or Kester SN63/PB37 solder, 44 rosin core will both work well for audio and circuit board applications.

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🔥 Solder like a pro — precision, power, and performance in every spool!

TRUSTED ALLOY - Classic 60/40 leaded formula ensures strong, conductive, and durable connections.
PRECISION PERFECT - Ultra-fine 0.031" diameter wire for detailed, clean soldering.
LONG LASTING SUPPLY - Generous 1 lb spool keeps your projects flowing without interruption.
ROSIN CORE ADVANTAGE - Built-in Kester 44 rosin flux streamlines soldering with superior wetting action.
PRO GRADE RELIABILITY - Preferred by professionals for consistent, high-quality electronic and hardware repairs.

KesterSOLDER 24-6040-0027 is a 1 lb spool of 0.031" diameter 60/40 leaded solder wire with Kester 44 rosin core flux, designed for reliable, high-quality solder joints in electronics and hardware applications.

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Is there a chart somewhere that says when/what to use 60/40 for and when to use 63-37 instead?

I just received this solder and nowhere on the packaging does it indicate a rosin core. Directions also say to add flux, Is it in fact Rosin Core?.

does anyone know how many meters does this comes with?

Would you use this solder for audio kit circuit boards like the wave "http://www.amazon.com/wave-analog-driven-spring-reverb/dp/b00r8jfblo/ref=sr_1_1"