These blades can throw sparks. Like any blade, when contacting metal, especially steel, can produce sparks. My experience has produced few sparks. But friction of metal blades against metal products produces heat in all situations and are always capable of producing sparks.
Yes it works well with gypsum board, and stays sharp for a long time.
Good Question, Just. I used this to cut off sections of a shed that had shingles
This will probably work better than a "standard" reciprocating blade, but it is NOT recommended. HardieTrim recommends cutting ONLY with a specific dust-reducing circular saw and PCD (polycrystalline diamond) tipped blade certified for HardieTrim products, preferably in conjunction with a HEPA dust collecting vacuum. A NIOSH respirator with appropriate filters would also be highly recommended. Also, for reference, PCD is generally more than 25x longer-lasting than carbide, so even with the greater amount of teeth in this product (sharing the wear) vs the 4-6 teeth typical of circular saw blade designed for HardieTrim, this may still wear faster than you expect.
Yes, but not a large amount
Yes !! It is an amazing saw blade.
I used them to cut 3/8" x 6" structural C-Channel, they are too slow. Ended up using grinders with cut-off wheels, finished cutting 19 pieces in less than 2 hours.