Enhanced TDS
Identification & Functionality
- Chemical Family
- RTU Product Type
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
Applications & Uses
- Composites Processing Methods
- Product End Uses
- Markets
- Applications
- Processing Methods
Casting / Vacuum casting
- Application Information
Encapsulating or potting of low voltage and electronic components
Properties
- Product Data
ARALDITE® MY 740 Unmodified, medium viscosity, solvent free epoxy resin
Property Value Unit Test Method Condition Viscosity (Hoeppler) at 25°C ca. 12,000 mPa·s - at 25°C Specific gravity at 25°C 1.16 g/cm³ - at 25°C Flash point > 200 °C DIN 51 758 - Epoxy content 5.3 Eq/kg - - HARDENER HY 956 EN Modified hardener based on aliphatic polyamine
Property Value Unit Test Method Condition Viscosity (Hoeppler) at 25°C ca. 450 mPa·s - at 25°C Specific gravity at 25°C 1.02 g/cm³ - at 25°C Flash point 175 - 185 °C DIN 51 758 - HARDENER HY 1473 BD Modified hardener based on polyamidoamine
Property Value Unit Test Method Condition Viscosity (Hoeppler) at 25°C 700 mPa·s - at 25°C Specific gravity at 25°C 0.98 g/cm³ - at 25°C Flash point 116 - 122 °C DIN 51 758 -
Technical Details & Test Data
- Product Properties
Cured for 24 h/25°C+6 h/60°C
System - - 1 2 3 Shore D hardness (4 mm plate)
- DIN 53 505 74 70 74 Glass Transition Temperature (DSC, Mettler TA 4000) °C DIN 51 005 79 73 80 Tensile strength at 25°C MPa ISO/R 527 83 74 69 Max. tensile stress at 25°C MPa ISO/R 527 83 74 69 Elongation at break at 25°C % ISO/R 527 4 4 4 Elastic modulus from Tensile Test at 25°C MPa ISO/R 527 3506 3121 3372 Water Absorption (10 days at 23°C) % by wt. ISO 62 0.43 0.35 0.5 Water Absorption (30 min at 100°C) % by wt. ISO 62 0.16 0.19 0.49 Dielectric constant εr (50 Hz) at 23°C [-] DIN 53 483 4.1 3.6 4.1 Dielectric constant εr (50 Hz) at 60°C [-] DIN 53 483 4.3 3.9 4.3 Dielectric constant εr (50 Hz) at 80°C [-] DIN 53 483 5 5.4 4.8 Dielectric constant εr (50 Hz) at 100°C [-] DIN 53 483 5.5 7.3 5.6 Dissipation factor tan δ (50 Hz) at 23°C % DIN 53 483 0.4 0.2 0.4 Dissipation factor tan δ (50 Hz) at 60°C % DIN 53 483 0.3 1.4 0.3 Dissipation factor tan δ (50 Hz) at 80°C % DIN 53 483 3.5 10.6 3.0 Dissipation factor tan δ (50 Hz) at 100°C % DIN 53 483 11.6 26.9 11.0 Volume resistivity at 23°C Ω·cm DIN 53 482 4 × 10¹⁵ 2 × 10¹⁶ 1 × 10¹⁶ Volume resistivity at 60°C Ω·cm DIN 53 482 4 × 10¹³ 5 × 10¹³ 3 × 10¹⁴ Volume resistivity at 80°C Ω·cm DIN 53 482 6 × 10¹¹ 3 × 10¹¹ 2 × 10¹² Volume resistivity at 100°C Ω·cm DIN 53 482 6 × 10¹⁰ 2 × 10¹⁰ 2 × 10¹¹ Electrolytic corrosion grade DIN 53 489 A-1 A-1 A-1 Tracking resistance CTI IEC 112 CTI > 600 CTI > 600 CTI > 600 Electric strength (20 s for 1 mm plate) at 23°C kV/mm IEC 243 28 27 30 - Processing Information
System - - 1 2 3 Initial viscosity (Hoeppler) at 25°C at 25°C mPa·s 4390 4350 4410 Initial viscosity (Hoeppler) at 40°C at 40°C mPa·s 820 920 850 Pot life (Hoeppler) to 1500 mPa·s at 40°C at 40°C min 12 13 11 Pot life (Hoeppler) to 15,000 mPa·s at 25°C at 25°C min 36 45 38 Minimum Cure time at 25°C at 25°C h 24 24 24 Minimum Cure time at 40°C at 40°C h 6 - 10 6-10 6-10 Minimum Cure time at 60°C at 60°C h 2 - 3 2-3 2-3 - Product Properties
- Good mechanical resistance
- Good resistance to atmospheric and chemical degradation
- Processing Guidelines
- The resin component should be stirred and homogenized in the original container before use.
- The casting mix is best prepared by heating the resin up to 40-50°C before stirring in the hardener. Brief degassing of the mix under 5-10 mbar vacuum improves the mixture homogeneity and enhances the dielectric properties of the castings. Araldite MY 740 is an alternative to Araldite F.
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.