Enhanced TDS
Identification & Functionality
- Chemical Family
- RTU Product Type
- Technologies
- Product Families
Features & Benefits
- Product Features
- Key Properties
- Good mechanical strength.
- Good resistance to atmospheric and chemical degradation.
- Excellent electrical properties
Applications & Uses
- Product End Uses
- Processing Methods
Casting; vacuum casting.
- Application Information
Encapsulating or potting of low voltage and electronic components.
Technical Details & Test Data
- Processing
Mixing
Measure (by weight or volume) the Araldite resin and the hardener. Add the hardener to the Araldite resin; making sure that the required amount of hardener is transferred to the resin. Stir thoroughly until mixing is complete. Air entrainment during mixing results in pores in the cured resin. Mixing under vacuum or in a metering-mixing machine is the most effective way to prevent air entrainment. Alternatively the static resin – hardener mixture may be deaerated in a vacuum chamber – allowing at least 200 % ullage for the foam to expand.
Curing
The chemical reaction initiated by mixing resin and hardener results in the generation of exothermic heat. The peak temperatures attained are determined by the starting temperature and the size and shape of the casting. Unfilled resin systems are suitable only for manufacturing castings weighing up to about 500 grams. Mineral filler should be added to dissipate heat and damp the exothermic reaction when producing large castings. There is very little exothermic reaction when producing very small castings or thin layers as the heat generated is rapidly dissipated. Cure is consequently delayed and the surfaces of castings may remain tacky. In such cases an infrared heater or oven at 40°C – 60°C should be used to effect full cure. When casting thick sections special care is needed to avoid excessive exothermic temperature rise. Short high-temperature curing schedules should not be used unless preliminary trials with castings manufactured to the specific design, and in the specified moulds, produce no unacceptable exothermic effects. To determine whether cross-linking has been carried to completion and the final properties are optimal, it is necessary to carry out relevant measurements on the actual object or to measure the glass transition temperature. Different gel and cure cycles in the customer’s manufacturing process could lead to a different degree of cross-linking and thus a different glass transition temperature.
- Processing Guidelines
Mix Viscosity ARALDITE® DBF / ARADUR® HY 951 Rheomat, at 25°C mPa*s 850 Mix Viscosity at 40°C
ARALDITE® DBF / ARADUR® HY 951 Rheomat, at 25°C mPa*s 280 Pot life ARALDITE® DBF / ARADUR® HY 951 Time to reach 5000 mPa*s, at 25°C min 93 Pot life ARALDITE® DBF / ARADUR® HY 951 Time to reach 15000 mPa*s, at 25°C min 135 Pot life ARALDITE® DBF / ARADUR® HY 951 Time to reach 5000 mPa*s, at 40°C min 59 Pot life ARALDITE® DBF / ARADUR® HY 951 Time to reach 15000 mPa*s, at 40°C min 76 Gel time ARALDITE® DBF / ARADUR® HY 951 Gelnorm, at 25°C min 160 Gel time ARALDITE® DBF / ARADUR® HY 951 Gelnorm , at 40°C min 70 Gel time ARALDITE® DBF / ARADUR® HY 951 Gelnorm, at 60°C min 20 Minimum Curing Cycle
ARALDITE® DBF / ARADUR® HY 951 24 - 48 hours at RT or 4 h at RT + 4 h at 60°C
- Cured Properties
Color of Casting Yellowish at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Density 1.19 g/cm³ ISO 1183 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Glass Transition Temperature 67 °C ISO 6721 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Shear Modulus 1230 MPa ISO 6721 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Hardness 85 Shore D ISO 868 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Tensile Strength 52 MPa ISO 527 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Elongation at Break 11 % ISO 527 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Tensile Modulus 2800 MPa ISO 527 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Thermal Linear Coefficient of Expansion (Alpha 1) 87 ppm/K ISO 11359-2 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Thermal Linear Coefficient of Expansion (Alpha 2) 174 ppm/K ISO 11359-2 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C
Water Absorption 0.16 % by wt. ISO 62 at 23°C, for 1 day, Cured for 6 hours at RT + 6 hours at 60°C
Water Absorption 0.53 % by wt. ISO 62 at 23°C, for 10 days, Cured for 6 hours at RT + 6 hours at 60°C
Water Absorption 0.57 % by wt. ISO 62 at 100°C, for 30 min, Cured for 6 hours at RT + 6 hours at 60°C
Dielectric Strength 25 kV/mm IEC 60243-1 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C, 3 mm specimen
Dielectric Loss Factor 1.2 % IEC 60250 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C, tan δ, 50Hz, 25°C
Dielectric Constant 4.2 IEC 60250 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C, εr, 50Hz, 25°C
Volume Resistivity 7 x 10¹⁵ Ω cm IEC 60093 at 23°C, Cured for 6 hours at RT + 6 hours at 60°C, ρ, 25°C
Safety & Health
- First Aid
Contamination of the eyes by resin, hardener or casting 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.
- Handling Precautions
Safety precautions at workplace:
protective clothing : Yes.
gloves : Essential.
arm protectors : Recommended when skin contact likely.
goggles/safety glasses : Yes
respirator/dust mask : Recommended.
Skin protection:
before starting work : Apply barrier cream to exposed skin.
after washing : Apply barrier or nourishing cream
Cleaning of contaminated skin : Dab off with absorbent paper, wash with warm water and alkali-free soap, then dry with disposable towels. Do not use solvents.
Clean shop requirements : Cover workbenches, etc. with light colored paper. Use disposable beakers, etc.
Disposal of spillage : Soak up with sawdust or cotton waste and deposit in plastic-lined bin.
Ventilation:
of workshop : Renew air 3 to 5 times an hour.
of workplace : Exhaust fans. Operatives should avoid inhaling vapors.
Storage & Handling
- Storage Conditions
Store the components in a dry place at room temperature, in tightly sealed original containers. Under these conditions, the shelf life will correspond to the expiry date stated on the label. After this date, the product may be processed only after reanalysis. Partly emptied containers should be tightly closed immediately after use. For information on waste disposal and hazardous products of decomposition in the event of a fire, refer to the Material Safety Data Sheets (MSDS) for these particular products.
Other
- Processing & Application Methods
- Application Information
Value Units Test Method / Conditions Mix Ratio 0.1 %(W) Hardener : Resin