Crystic 90-78PA Pre-accelerated Polyester Bonding Paste
Crystic 90-78PA is a pre-accelerated polyester bonding paste. It is a viscous, filled compound specifically designed for the assembly and bonding of GRP mouldings. Such applications include panels, inserts, internal frames, ribs, etc., and any other non structural bonding applications. The use of this bonding paste gives high shear-strength structures without the need for mechanical fixings.
Crystics 90-78PA should be allowed to attain workshop temperature (18ºC - 20ºC) before use. Stir well by hand, or with a low shear mixer to avoid aeration, and then allow to stand to regain thixotropy. Crystics 90-78PA require only the addition of catalyst to start the curing reaction. The recommended catalyst is Catalyst M (or Butanox M50), which should be added at 1% into the bonding paste. The catalyst should be thoroughly incorporated into the material with a low shear mechanical stirrer where possible.
Pot life at 15°c (M50 Catalyst) approx 14 Minutes
Pot life at 20°c (M50 Catalyst) approx 10 Minutes
Pot life at 25°c (M50 Catalyst) approx 8 Minutes
When used with other mekp catalyst pot life results may vary.
As a rough guide, 4kg of bonding paste will cover one square metre to a depth of approximately 3mm.
Crystics 90-78PA is supplied ready to use. The addition of pigments or other materials can adversely affect the degree of cure and bond strength obtained.
Satisfactory bonds for most applications can be obtained by curing Crystics 90-78PA at workshop temperature (20ºC).
Curing Schedule - 24 hrs at 20ºC, 3 hrs at 80ºC
Curing Schedule - 24 hrs at 20ºC, 5 hrs at 80ºC, 3 hrs at 120ºC