Compared to, say, polyester resin designed for similar purposes?
Is it actually more expensive to manufacture due to material costs or complexities of processing, or is the comparatively high price just a reflection of its greater ‘value’ in use - i.e. better adhesion properties than polyester, etc?
I have wondered this as well, I looked up the MSDS form for Epoxy Resin once, and it had several pages of bad stuff associated with it’s volatility, packaging, chemical make-up that really made it something that “…is not just a toy…” or something to be trifled with. This may lend to its high cost.
most polyester resin is very cheap to make (used to work for a resin company). The starting materials were cheap and you had a wide tolerance in the viscosity (you could adjust it later)
Epoxy resins often use solvents, more expensive starting materials, and depending on the type of resin, are trickier to make as the tolerances are tighter