ARALDITE® DBF / ARADUR® HY 956

• Good heat resistance
• Good resistance to atmospheric and chemical degradation

• Casting
• Vacuum casting

Encapsulating or potting of low voltage and electronic components

Mixing

Measure (by weight or volume) the ARALDITE resin and the ARADUR hardener. Add the hardener to the 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 104ºF – 140ºF (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 molds, 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.

Do not use or handle this product until the Material Safety Data Sheet has been read and understood

Personal Hygiene

Safety precautions at workplace
Protective clothing : Yes
Gloves : Essential
Arm protectors : Recommended when skin contact is 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 solvents.
Clean shop requirements : Cover workbenches/areas with light colored paper. Use disposable beakers.
Disposal of spillage : Soak up with sawdust or cotton waste cloth and deposit in plastic-lined bin.
Ventilation
Of workshop : Renew air 3 to 5 times an hour
Of workplaces : Exhaust fans should be used to prevent operators from inhaling vapors.

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 vapors should be moved out of doors immediately. In all cases of doubt call for medical assistance.

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.