Which of the following is not a casting performance of phenolic – urethane cores?
(a) Moderate hot strength
(b) Good hardenability
(c) Surface finish
(d) Low nitrogen level
This question was posed to me during an online exam.
My enquiry is from Comparative Properties of Gas-Vapour Cured Resin Binders topic in portion Binder Technology of Casting-Forming-Welding II