What is the catalyst for polyester resin?
What is the catalyst for polyester resin?
Methyl Ethyl Ketone Peroxide
MEKP (Methyl Ethyl Ketone Peroxide) is the catalyst added to polyester resins and vinyl ester resins. As the catalyst mixes with the resin, a chemical reaction occurs, creating heat which cures (hardens) the resin. Use approximately 1/2 oz per quart of resin.
Does polyester resin need a catalyst?
Gelcoat and Polyester resin, including Boatyard use a standard catalyst, or the 925 catalyst. These resins only require about 1.5% catalyst and are quite specific on the ratios, especially in hot weather. You will also use the same ratio’s for Polyester-based putty, like our OEM Super Poly Fill, or our gelcoat putty.
How do you catalyze polyester resin?
POLYESTER RESIN/GELCOAT IS CATALYZED WITH MEKP (METHYL ETHYL KETONE PEROXIDE). THE RATIO IS APPROXIMATELY ONE OUNCE OF HARDENER PER GALLON OF RESIN. USE THE FOLLOWING RATIOS FOR SMALLER AMOUNTS. THESE AMOUNTS ARE EASILY MEASURED IN THE OUNCE CUP WHICH IS SUPPLIED WITH THE RESIN.
How many drops of catalyst do I need for resin?
a. Fibreglass Resin: for 100ml of resin (cold day) use 2.5 to 3ml catalyst; and for 100ml resin (hot day) use 1.5 to 2ml catalyst. 3. Use a measuring cup for the amount of catalyst needed or if using the dropper bottle 1ml = 50 drops.
How much catalyst do I need for polyester resin?
A rule of thumb for polyester laminating resin is between 1% and 2% i.e. 1% for summer (to give maximum wetting time) and 2% for winter. For polyester Gelcoats used in a moulding situation, we recommend from 2% to 2.5%catalyst.
Will polyester resin cure without catalyst?
Resin will eventually become hard even without catalyst, but becoming hard and actually curing correctly are two very different things. Even if it became hard it would be weak and most likely fail.
How much catalyst do you need for polyester resin?
What is the ratio of catalyst to resin?
Generally speaking, for Polyester Resins, the mixing ratio is 2% i.e. 20ml for every 1kg of Resin in working conditions at room temperature. For the Water Clear Casting Polyester Resin, this drops to 1.5% or 15ml for every 1kg.
Does resin harden without catalyst?
Things You’ll Need You let it sit, and sit, and sit, but it never completely hardens. Chances are you did not add enough catalyst, the chemical that hardens the resin.