Vantico Ltd

ElectronicPolymers

Encapsulating Systems

®Araldite Casting Resin System

Araldite CW 2248 100 pbwHardener HY 956 EN 11 pbw

Optimally filled casting resin system for processingand curing at room temperature

Miniature transformers (line transformer, switch modes, coils, chokes) Applications

Casting / Vacuum casting Processing

Good dielectric propertiesLow water absorptionOutstanding flame retardance

Properties

Edition: July 2000Replaces edition: June 1998

Product data(Guideline values)

Modified, solvent free epoxy resin containing mineral filler

Araldite CW 2248 Viscosity at 25°C mPa s ca. 16 000Specific gravity at 25°C g/cm³ 1.6Flash point DIN 51 758 °C 140Filler content % 55

As supplied form Filled, highly viscous liquidHazardous decomposition Carbon monoxide, carbon dioxide andproducts other toxic gases and vapours if burnedDisposal Regular procedures approved

by national and/or local authorities

Modified, aliphatic polyamine hardener

HardenerHY 956 EN

Viscosity at 25°C mPa s 450Specific gravity at 25°C g/cm³ 1.02Flash point DIN 51 758 °C 152

As supplied form Clear, pale yellow or yellow liquidHazardous decomposition Carbon monoxide, carbon dioxide andproducts other toxic gases and vapours if burnedDisposal Regular procedures approved

by national and/or local authorities

Storage Store the components in a dry place at 18-25°C, in tightly sealed original containers.Under these conditions, the shelf life will correspond to the expiry date stated on thelabel. After this date, the product may be processed only after reanalysis. Partly emptiedcontainers should be tightly closed immediately after use.For information on waste disposal and hazardous products of decomposition in the eventof a fire, refer to the Material Safety Data Sheets (MSDS) for these particular products.

Araldite CW 2248/HY 956 EN July 2000 2

Processing

The filled resin component should be stirred and homogenized in the original containerbefore use.The casting mix is best prepared by heating the resin up to 40-50°C before stirring in thehardener. Brief degassing of the mix under 5-10 mbar vacuum improves the mixturehomogeneity and enhances the dielectric properties of the castings.

Mix ratio Araldite CW 2248 parts by weight 100Hardener HY 956 EN parts by weight 11

Processing data(Guideline values)

Initial viscosity (Hoeppler) mPa s at 25°C ca. 6700at 40°C ca. 3200

Pot life to 15 000 mPa s min at 25°C ca. 27(Hoeppler) at 40°C ca. 20

Minimum curing time h at 25°C ≥ 24 at 40°C 12

at 60°C 6

Araldite CW 2248/HY 956 EN July 2000 3

PropertiesGuideline values determined on standard test specimens cured for 24 h/25°C+6 h/60°C

Colour of castings beige

Specific gravity at 25°C DIN 55 990 g/cm3 1.58

Shore D hardness (4 mm plate) at 25°C DIN 53 505 81

Glass transition temperaturederived from torsion modulus °C 86

Martens deflection temperature DIN 53 458 °C 65

Flexural strengthmax. bending stress at 25°C ISO 178 MPa 90surface strain at 25°C ISO 178 % 1.5

Impact strength at 25°C ISO 179 kJ/m2 7

Compressive strengthmax. compressive stress at 25°C ISO 604 MPa 112

Tensile strengthmax. tensile stress at 25°C ISO/R 527 MPa 45elongation at break at 25°C ISO/R 527 % 1

Elastic tension modulus at 25°C DIN 53 457 MPa 6500

Flammability UL 94 grade V-0 6 mm

Water absorption10 days at 23°C ISO 62 % 0.0930 min at 100°C ISO 62 % 0.22

Coefficient of linear thermalexpansion DIN 53 752 ppm/K 44⋅

Thermal conductivity DIN 52 612 W/mK 0.69

Dielectric constant εr at 23°C DIN 53 483 5.3at 35°C 5.7

Dissipation factor tan δ at 23°C DIN 53 483 % 7.9at 35°C 10.6

Volume resistivity ρ at 23°C DIN 53 482 Ω⋅cm 5⋅1014

at 35°C 5⋅1014

at 40°C 1⋅1014

at 50°C 5⋅1013

Electrolytic corrosion DIN 53 489 grade A-1

Tracking resistance IEC 112 CTI>600

Electric strength20 s value for 2 mmplate (50 Hz) at 23°C IEC 243 kV/mm 15

Araldite CW 2248/HY 956 EN July 2000 4

Notes

Araldite CW 2248/HY 956 EN July 2000 5

Industrial hygieneMandatory and recommended industrial hygiene procedures should be followed when-ever our products are being handled and processed. For additional information pleaseconsult the corresponding Safety Data Sheets and the brochure “Hygienic precautions forhandling plastics products of Vantico (Publ. No. 24264/e).

Handlingprecautions

Safety precautions at workplace:protective clothingglovesarm protectorsgoggles/safety glassesrespirator/dust mask

Skin protectionbefore starting workafter washing

Cleansing of contaminated skin

Clean shop requirements

Disposal of spillage

Ventilation:of workshopof workplace

yesessentialrecommended when skin contact likelyyesno

Apply barrier cream to exposed skinApply barrier or nourishing cream

Dab off with absorbent paper, wash with warmwater and alkali-free soap, then dry withdisposable towels. Do not use solvents

Cover workbenches, etc. with light colouredpaper. Use disposable beakers, etc.

Soak up with sawdust or cotton waste anddeposit in plastic-lined bin

Renew air 3 to 5 times an hourExhaust fans. Operatives should avoid inhalingvapours.

First Aid Contamination of the eyes by resin, hardener or casting mix should be treatedimmediately by flushing with clean, running water for 10 to 15 minutes. A doctor shouldthen be consulted.Material smeared or splashed on the skin should be dabbed off, and the contaminatedarea then washed and treated with a cleansing cream (see above). A doctor should beconsulted in the event of severe irritation or burns. Contaminated clothing should bechanged immediately.Anyone taken ill after inhaling vapours should be moved out of doors immediately. In allcases of doubt call for medical assistance.

Vantico LtdElectronic Polymers® Registered trademark

APPROVED TO ISO 9000 ff

All recommendations for use of our products, whether given by us in writing, verbally, orto be implied from results of tests carried out by us are based on the current state of ourknowledge. Notwithstanding any such recommendations the Buyer shall remainresponsible for satisfying himself that the products as supplied by us are suitable for hisintended process or purpose. Since we cannot control the application, use or processingof the products, we cannot accept responsibility therefore. The Buyer shall ensure thatthe intended use of the products will not infringe any third party’s intellectual propertyrights. We warrant that our products are free from defects in accordance with and subjectto our general conditions of supply.

2 August, 2000 / CW2248.doc