Epoxy Prepregs

ST 95

STRUCTURAL SPRINT™
  • Good balance of mechanical properties
  • Excellent laminate quality
  • Extremely low void content
  • Drapeable and conformable
  • Good tack
  • Fast layup
  • No debulk necessary between plies
  • Variable cure temperature (85-125°C)

The patent-approved ST 95 Structural SPRINT™ is a moulding material that consists of two layers of carbon or glass reinforcement either side of a precast, precatalysed resin film. The material therefore has the appearance of dry reinforcement that has resin concealed at its centre. ST 95 is available in woven or unidirectional fabric skewed to ± 45° angles in a range of weights and fabric formats with a light tack film on one side to aid mould placement.

ST 95 is a toughened hot-melt, epoxy resin that offers an extremely good balance of mechanical properties. It has been specially formulated to maximise the outlife of SPRINT™ products at room temperature. It is ideal for structural components where improved impact performance and resistance to resin microcracking is desired.

ST 95 has a flexible cure envelope from 12 hours at 85°C to 1 hour at 120°C. This makes it suitable for use in regular part production as well as for the development of trial components. The material is highly drapeable and has been designed for simple vacuum bag processing.

Typical Applications

ST 95 can be used in the making of chassis, bulkheads and general structural items for automotive, marine and industrial applications.

Technical Data

​Working Props

ST 95 CARBON & ST 95 GLASS

WORKING PROPERTIES - SPRINT™ MATRIX TEST METHOD
Minimum Cure Tempertaure (°C) 85 DSC
Minimum Cure Time (@ min cure temp) (hours) 10 DSC
Minimum Viscosity (isothermal @ min. cure temp) (P) 38-54p
Rheometer
Minimum Viscosity (1°C/minute ramp) (P) 24-28p
Rheometer
Temperature @ min viscosity (1°C/minute ramp) (°C) 100-102°C Rheometer
Minimum Cure Time @ 90°C (hrs/mins) 6:00 DSC
Minimum Cure Time @ 100°C (hrs/mins) 3:00 DSC
Minimum Cure Time @ 110°C (hrs/mins) 1:30 DSC
Minimum Cure Time @ 120°C (hrs/mins) 0:45 DSC
​​Carbon Mech Props

ST 95 CARBON

SPRINT™ Matrix CARBON SKEWED CARBON
ST95/ +45C200/42%/-45C200
SKEWED CARBON
ST95/ +45C200/42%/-45C200
WOVEN CARBON
2x2 twill 200g/RC200T/RC200T
Cure (time/temp/pressure) 1 hour / 120°C / 1bar 10 hrs / 85°C / 1bar 10 hrs / 85°C / 1bar
Process vacuum bag vacuum bag vacuum bag
Fibre Weight (g/sqm) 400 400 400
SPRINT™ Areal Weight (g/sqm) 690 690 690
SPRINT™ Resin Content (%bw) 42% 42% 41%
Tensile Strength 852.6 MPa 845.6 MPa 644.8 MPa
Tensile Modulus 55.65 GPa 56.29 GPa 60.99 GPa
Tensile Laminate Fibre Volume 45.52% 45.6% 49.1%
Av. Cured Ply Thickness 0.49mm 0.49mm 0.457mm
Normalised Tensile Strength @ 60% FVF 1123.8 MPa
1112.6 MPa
788 MPa
Normalised Tensile Modulus @ 60% FVF 73.35 GPa 74.1 GPa 74.5 GPa
Compressive Strength 505.4 MPa 497.6 MPa 537.2 MPa
Compressive Modulus 50.9 GPa 51.5 GPa
54.0 GPa
Compressive Laminate Fibre Volume 44.8% 45.9% 48.4%
Normalised Comp Strength @ 60% FVF 676.9 MPa 650.3 MPa 679.9 MPa
Normalised Comp Modulus @ 60% FVF 66.6 GPa 67.2 GPa 66.9 GPa
ILSS (MPa) 57.5 MPa 50.5 MPa 62.3 MPa
​Glass Mech Props

ST 95 GLASS

SPRINT™ Matrix GLASS SKEWED GLASS
ST95/ +45E465/42.6%/-45E465
SKEWED GLASS
ST95/ +45E465/42.6%/-45E465
WOVEN GLASS
ST95/WRE581T/41%/WRE581T
WOVEN GLASS
ST95/WRE581T/41%/WRE581T
Cure (time/temp/pressure) 1 hour / 120°C / 1bar 10 hrs / 85°C / 1bar 1 hour / 120°C / 1bar 10 hrs / 85°C / 1bar
Process vacuum bag vacuum bag vacuum bag vacuum bag
Fibre Weight (g/sqm) 930 930 1160 1160
SPRINT™ Areal Weight (g/sqm) 1620 1620 1966 1966
SPRINT™ Resin Content (%bw) 42.6% 42.6% 41% 41%
Tensile Strength 450.8 MPa 336.1 MPa 478.1 MPa 475.05 MPa
Tensile Modulus 23.9 GPa 20.5 GPa 22.6 GPa 22.75 GPa
Tensile Laminate Fibre Volume 49.0% 41.95% 41.94% 43.11%
Av. Cured Ply Thickness 0.73mm 0.85mm 1.07mm 1.05mm
Normalised Tensile Strength @ 60% FVF 552.0 MPa
480.7 MPa
684.0 MPa 661.2 MPa
Normalised Tensile Modulus @ 60% FVF 29.3 GPa 29.1 GPa 32.33 GPa 31.66 GPa
Compressive Strength 411.2 MPa 458.7 MPa 498.4 MPa 506.4 MPa
Compressive Modulus 27.17 GPa 21.3 GPa
22.87 GPa 22.15 GPa
Compressive Laminate Fibre Volume 51.5% 43.0% 42.87% 43.15%
Normalised Comp Strength @ 60% FVF 478.5 MPa 640.6 MPa 697.6 MPa 704.1 MPa
Normalised Comp Modulus @ 60% FVF 31.4 GPa 29.8 GPa 32.66 GPa 30.44 GPa
ILSS (MPa) - 44.9 MPa 54.66 MPa 55.16 MPa
​Third Party Certs
CERTIFICATE ISSUER CERTIFICATE
Germanischer Lloyd WP 1430018 HH
Germanischer Lloyd WP 1430019 HH
Germanischer Lloyd WP 1430023 HH
Germanischer Lloyd WP 1430033 HH
​Ancilliaries
PRODUCT DESCRIPTION
SF 80 SPRINT™ Toughened Surfacing Film
SA 80 Epoxy Adhesive Film
SP 9435 Mono-Component Epoxy System