Would this work well to solder switches to a PCB on a mechanical keyboard?

Yes, this is excellent solder for electrical applications. However, keep in mind this is a large roll that is a lot more then you would need if you are only doing one keyboard. I work on home electronics all the time and still l have a roll I bought at least 3 years ago that I use almost weekly. If you only need a small amount I would recommend you go to sparkfun.com they sell small quantities of solder for small jobs, it may not be Kester brand but it is good solder for your job.

Is this a multicore solder?

All Kester Solder products are single core.

The diameter of this solder is less than 1/32?

1/32" is 0.031", so yes, even if it actually measures out to .022" it is smaller than 1/32" This product is available in 0.031" if you prefer a thicker solder.

Does the Kester 44 solder have a shelf life or expire in x number of years?

The jist: it lasts forever in a dry, non corrosive environment. The expiration date on the box is for the manufacturers warranty. Here is the document from Kester's website explaining: http://www.kester.com/Portals/0/Documents/Knowledge%20Base/Kester%20Shelf%20Life%20Policies.pdf?ver=2016-09-13-140726-910

Kester 24 6337 0010 44 Rosin Core Solder 63 37

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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€ 141.72

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Solder smarter, shine brighter — the pro’s choice for flawless joints!

TRUSTED FOR DECADES - Join the millions who rely on Kester’s industry-standard rosin core solder 🛠️
BRILLIANTLY SHINY FINISH - Impress with clean, bright solder joints that scream professional quality ✨
OPTIMIZED FLUX FORMULATION - High-activity rosin core ensures smooth, reliable soldering every time
LIGHTNING FAST WETTING ACTION - Get your solder joints done in record time with instant flux activation ⚡
VERSATILE METALLIZATION COMPATIBILITY - Works seamlessly across a wide range of metals for all your projects

Kester 24-6337-0010 44 Rosin Core Solder is a 63/37 tin-lead alloy on a 1 lb spool, featuring a high-activity rosin core flux that delivers instant wetting and bright, shiny joints. Trusted for over 40 years, it’s the go-to solder for reliable, professional-grade results across diverse metallizations.

Specifications

ASIN	B00068IJWC
Best Sellers Rank	#55,577 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #117 in Solder
Date First Available	November 19, 2009
Item Weight	1 pounds
Item model number	24-6337-0010
Manufacturer	Kester
Product Dimensions	2.5 x 2.5 x 2.25 inches

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