Epoxy system SR8500 / KTA311

SR8500 / KTA311 epoxy system for cold (or hot) preimpregnation

Each kilo includes 0.83 kg resin + 0.17 kg hardener

SR8500 / KTA311 is a 2 component, slow reactivity, solvent and reactive diluent free matrix system, designed for manual, (hand,) in-house fabric preimpregnation. Before mixing, the 2 components have a storage life of at least 1 year. After mixing and impregnation, the resulting preimpregnated fabric develops the desired tack at room temperature, and may be placed in a freezer. The out (of the freezer) life of this prepreg is at least 1 month. Consequently, this system is a versatile, cost effective solution that helps small production facilities to reduce their stock, and avoid keeping large quantities of various kinds of prepregs in the freezer. Curing temperature range is from 80 to 150 ^oC.

Applications:
Fabric preimpregnation by hand or machine, filament winding and adhesives. Particularly useful also for very large parts and hot press moulding.

PROPERTIES
Epoxy resin R244:
Aspect / colour: Yellowish viscous liquid
Density (kg/L) at 20 ^oC: 1.176 ± 0.004
Viscosity (mPa.s) at 20 ^oC: 9 800 ± 500

Hardener KTA311:
Aspect / colour: White viscous liquid
Viscosity at 20 ^oC: 6 000 ± 1 000
Density at 20 ^oC: 1.14 ± 0.01

Mix properties of SR8500 / KTA311:
Weight ratio: 100 / 21 g
Volume ratio: 100 / 21.6 ml

Tack evolution:
Let @ 30 ^oC for 24 hours or 12 hours at 40 ^oC

Gel time (mixed SR8500 / KTA311 system, heated immediately at temperature:)
150 ^oC: 1' 23 ''
130 ^oC: 3'
120 ^oC: 5' 40''
110 ^oC: 11'
100 ^oC: 20'
90 ^oC: 36'
80 ^oC: 1 h 20'

Dry to touch (mixed SR8500 / KTA311 system, heated immediately at temperature:)
150 ^oC: 1' 53''
130 ^oC: 4' 30''
120 ^oC: 8' 40''
110 ^oC: 20''
100 ^oC: 38''
90 ^oC: 1 h 37'
80 ^oC: 3 h 10'

Recommended post-curing cycle (mixed SR8500 / KTA311 system, put immediately at temperature:)
80 ^oC: 24 hours
90 ^oC: 8 hours
100 ^oC: 4 hours
110 ^oC: 2 hours
120 ^oC: 1 hour
130 ^oC: 15'
150 ^oC: 8'

For detailed data sheet please contact.