CYPLY is a cured epoxy composite material based on a unique non-woven, parallel filament construction. This type of construction minimizes filament stress abrasion that can shorten fatigue life in conventional reinforced plastics. CYPLY uses type E continuous filament fiberglass. It is supplied as cured flat panels or cut to size shapes.


Its many applications include : vibratory springs, dock shelter staves, shocks and struts, insulation spacers, insulated rail joints, flexible coupling and furniture springs.


Features and benefits

High impact strength
High strength-to-weight performance
Low notch sensitivity
Resistant to cleaning fluids and solvents
Weight reduction
Chemical and corrosion resistance
Excellent fatigue life and high strain capability
Less downtime in harsh environnements
Greater capacity to store energy thant 1060 spring steel


Unidirectional (one ply)
Average cured thickness 0.010" (0.25 mm)
Average uncured thickness 0.011" (0.28 mm)
Crossply (two plies)
Average cured thickness 0.020" (0.50 mm)
Average uncured thickness 0.022" (0.56 mm)
Isotropic (three plies)
Average cured thickness 0.030" (0.76 mm)
Average uncured thickness 0.033" (0.84 mm)

Physical properties

Weight (lb/yd²) (kg/m²) 0.85 (046) Unidirectional
Resin Content (% by weight) 36 +/- 3%
Specific gravity (cured average) 1.85
Barcol hardness 70
Wet strength retention (2 hours boil) 85%

Mechanical properties at various temperatures

Flexural strength (PSI x 103) (ASTM D-790) 76 (525 Mpa)
Flexural modulus (PSI x 0 103) (ASTM D-790) 3.5 (24.1 Gpa)
Flexural modulus (PSI x 103) (ASTM D-790) 2.9 (20.0 Gpa)
Tensile strength (PSI x 103) (ASTN D-638) 48 (330 Mpa)
Tensile modulus (PSI x 106) (ASTM D-638) 2.5 (17.2 Gpa)
Compressive strength (PSI x 103) (ASTM D-3410) 75 (520 Mpa)

Electrical properties

Dissipation factor
Conditioned @ R.H. 50%
Test temperature 23°C
Frequency 1KC 0.0033
Dielectric constant
Conditioned @ R.H. 50%
Test temperature 23°C
Frequency 1 KC 6.1
Volume resistivity (Ohms-cm)
Conditioned @ R.H. 50%
Test temperature 23°C
Frequency 60 Hz (109 V.D.C) 4.9 X 1017
Insulation resistance (Ohms)
Conditioned @ R.H. 50%
Test temperature 23°C
Frequency (109 V.D.C.) 6.2 X 1011
Dielectric strength
Conditioned @ R.H. 50%
Test temperature 23°C
Frequency (Volts/Mil) 620
Arc Resistance
Conditioned @ R.H. 90%
Test temperature 23°C
Time in seconds
Across filaments 80
Time in seconds
With filaments 20
N.B. The information, details and values indicated are to the best of our knowledge. We recommend to conduct tests according to local conditions. The data is subject to some variations without notice.