M
Mudder
Guest
By: Bill Daniels
(523K PDF)
(523K PDF)
Signed-In Members Don't See This Ad
Signed-In Members Don't See This Ad
hewunch
Member
Very informative! Thanks!
S
spiritwoodturner
Guest
Very interesting, and all in one place. I learned a lot of new things off that! Thanks for sharing, Scott.
Dale
Dale
mostangrypirate
Member
Bravo!!
M
Mudder
Guest
Please note that I only put these up. The are written by our membership. We should thank Bill for sharing.
OKLAHOMAN
Member
Bill, thanks that was very informative...
BigShed
Member
Bill, thanks for that article, very informative.
However, you refer to the PR resin type blanks as thermoplastics, they are actually thermosetting
From Wikipedia on Polyester resins:
Polyester resins are thermosetting; "thermosetting" means the plastic softens when initially heated, but sets permanently rigid once it has cooled (as opposed to "thermoplastics", which re-soften with heat). Polyester resin is often purchased in liquid form for the production of glass-reinforced plastic. In this case, a catalyst (typically methyl ethyl ketone peroxidebenzoyl peroxide is a somewhat less hazardous alternative suitable for some purposes.(MEKP) (also known as butanone peroxide) is used to initiate the polymerization reaction;
In general all the resins you refer to in your article are of the thermosetting type, ie they cure by heat or catalyst, once this process has taken place it cannot be reversed.
Thermoplastics OTH can be re-melted after processing.
Sorry, once a chemist, always a chemist!
However, you refer to the PR resin type blanks as thermoplastics, they are actually thermosetting
From Wikipedia on Polyester resins:
Polyester resins are thermosetting; "thermosetting" means the plastic softens when initially heated, but sets permanently rigid once it has cooled (as opposed to "thermoplastics", which re-soften with heat). Polyester resin is often purchased in liquid form for the production of glass-reinforced plastic. In this case, a catalyst (typically methyl ethyl ketone peroxidebenzoyl peroxide is a somewhat less hazardous alternative suitable for some purposes.(MEKP) (also known as butanone peroxide) is used to initiate the polymerization reaction;
In general all the resins you refer to in your article are of the thermosetting type, ie they cure by heat or catalyst, once this process has taken place it cannot be reversed.
Thermoplastics OTH can be re-melted after processing.
Sorry, once a chemist, always a chemist!