Enhanced TDS
Identification & Functionality
- Chemical Family
- RTU Product Type
- Technologies
- Product Families
Features & Benefits
Applications & Uses
- Application Area
- Composites Processing Methods
- Markets
- Applications
- Application Information
- Manufacture of electrical laminates (tubes, rods, etc.)
- Impregnation of high voltage bushings, coils etc.
Technical Details & Test Data
- Product Data
Araldite MY 740 Unmodified, medium-viscosity, solvent-free epoxy resin
Viscosity 10,000-14,500 mPa·s ISO 12058 at 25°C Epoxy content 5.25-5.55 equiv/kg ISO 3001 - Density 1.15-1.20 g/cm³ ISO 1675 at 25°C Flash point >200 °C ISO 1523 - Vapour pressure <0.01 Pa Knudsen at 25°C Vapour pressure <0.5 Pa Knudsen at 60°C Aradur HY 918-1 Liquid, anhydride hardener
Viscosity 50-70 mPa·s ISO 12058 at 25°C Density 1.2-1.22 g/cm³ ISO 2811 at 25°C Flash point 159 °C ISO 1523 - Vapour pressure ≈1 Pa Knudsen at 25°C Vapour pressure ≈10 Pa Knudsen at 60°C Accelerator DY 062 Liquid, tertiary amine accele
Viscosity 50-70 mPa·s ISO 12058 at 25°C Density 1.2-1.22 g/cm³ ISO 2811 at 25°C Flash point 159 °C ISO 1523 - Vapour pressure ≈1 Pa Knudsen at 25°C Vapour pressure ≈10 Pa Knudsen at 60°C - Processing Methods
- Pultrusion
- Wet laminating
- Trickle Impregnation
- Filament Winding
- Product Properties
- Good mechanical and dielectric properties at elevated temperature
- Good aging resistance
- Low exothermic reaction for 0.2 pbw DY 062
- Processing Guidelines
Initial viscosity (Hoeppler / ISO 12058)
Condition Unit Value at 25°C mPa s 700 700 800 at 60°C mPa s 70 70 90 Pot life (Hoeppler / ISO 12058)
Condition Unit Value to 1'500 mPa s at 60°C 23.6 h 3.3 h 88 min to 15'000 mPa s at 25C h > 50 Gel time (measured with Gelnorm / ISO 9396)
Condition Unit Value at 60℃ h > 36 5.6 3.3 at 80C min 440 80 45 at 100C min 105 19 9 at 120C min 28 5 3 at 140C min 10 3 2 - Mechanical, Physical and Electrical Properties
Cure Test Method Condition Unit 2h 80°C+ 2h 80°C + 2h 80°C + 24h 120°C 2h 120°C 2h 120°C Glass Transition Temperature ISO 11357-2 °C 120 - 130 120 - 130 125 - 135 Tensile strength ISO 527 MPa 85 - 95 75- 85 85- 95 Elongation at break ISO 527 % 4.8 - 5.8 3.0 - 4.0 4.7 - 6.5 E modulus from Tensile Test ISO 527 MPa 3'200 - 3'800 3'200 - 3'800 3'000 - 3'500 Flexural strength ISO 178 MPa 155 - 165 155 - 165 150 - 160 Surface strain ISO 178 % 5.5 - 6.59 5.2 - 6.4 5.5 - 6.5 E modulus from flesural test ISO 178 MPa 3'000 - 3'500 3'000 - 3'600 3'000 - 3'500 Water Absorption ISO 62 10 days at 23°C % 0.25 - 0.35 0.30 - 0.40 0.35 - 0.45 Water Absorption ISO 62 60 min at 100°C % 0.15 - 0.25 0.15 - 0.25 0.15 - 0.25 Dielectric constant € (50 Hz) IEC 60250 23°C 3.4 3.3 3.3 Dielectric constant € (50 Hz) IEC 60250 60°C 3.5 3.3 3.3 Dielectric constant € (50 Hz) IEC 60250 80°C 3.6 3.3 3.3 Dielectric constant € (50 Hz) IEC 60250 100°C 4.0 3.4 3.3 Dissipation factor tan 8 (50 Hz) 23C IEC 60250 23°C % 0.2 0.3 0.3 Dissipation factor tan 8 (50 Hz) 23C IEC 60250 60°C % 0.1 0.3 0.3 Dissipation factor tan 8 (50 Hz) 23C IEC 60250 80°C % 0.2 0.3 0.4 Dissipation factor tan 8 (50 Hz) 23C IEC 60250 100°C % 0.4 0.4 0.4 Volume resistivity p IEC 60093 23°C Ω-cm 5.6x 10¹⁶ 6.7x10¹⁶ 8.8 x 10¹⁶ Volume resistivity p IEC 60093 60°C Ω-cm 2.3 x 10¹⁶ 2.6 x 10¹⁶ 2.8 x 10¹⁶ Volume resistivity p IEC 60093 80°C Ω-cm 2.2 x 10¹⁶ 1.8 x 10¹⁶ 2.1 x 10¹⁶ Volume resistivity p IEC 60093 100°C Ω-cm 7.3x 10¹⁵ 6.5x 10¹⁵ 8.2 x 10¹⁵ Electrolytic corrosion IEC 60426 kV/mm A-1 A-1 A-1 Tracking resistance IEC 60112 CTI >600-0.4 CTI >600-0.4 > 600-0.6 Breakdown strength IEC 60243-1 grade 26 - 32 25- 30 22 - 27
Safety & Health
- Handling Precautions
Personal hygiene Safety precautions at workplace protective clothing overalls gloves essential arm protectors recommended when skin contact likely goggles/safety glasses yes Skin protection before starting work Apply barrier cream to exposed skin after washing Apply barrier or nourishing cream Cleansing of contaminated skin Dab off with absorbent paper, wash with warm water
and alkali-free soap, then dry with disposable towels.
Do not use solventsDisposal of spillage Soak up with sawdust or cotton waste and deposit in
plastic-lined binVentilation of workshop Renew air 3 to 5 times an hour Ventilation of workplaces Exhaust fans. Operatives should avoid inhaling
vapoursFirst Aid : Contamination of the eyes by resin, hardener or mix should be treated immediately by flushing with clean, running water for 10 to 15 minutes. A doctor should then be consulted. Material smeared or splashed on the skin should be dabbed off, and the contaminated area then washed and treated with a cleansing cream (see above). A doctor should be consulted in the event of severe irritation or burns. Contaminated clothing should be changed immediately. Anyone taken ill after inhaling vapours should be moved out of doors immediately. In all cases of doubt call for medical assistance.
Storage & Handling
- Storage Conditions
Store the components at 18-25°C, in tightly sealed and dry original containers. Under these conditions, the shelf life will correspond to the expiry date stated on the label. Product specific advise regarding storage can be found on product label. After this date, the product may be processed only following reanalysis. Partly emptied containers should be closed tightly immediately after use.
Other
- Mechanical Properties
Value Units Test Method / Conditions Flexural Strength 160.0 MPa MPa ISO 178 - Physical Properties
Value Units Test Method / Conditions Glass Transition Temperature (Tg) 125.0 °C °C Viscosity 700.0 mPa.s mPa.s at 25°C