ARALDITE® LY 1556 / ARADUR® 906 / ACCELERATOR DY 070

• Reactive diluent free matrix system with a very long pot life.
• The reactivity can be adjusted by varying the accelerator content.
• The system has very good high temperature performance after post cure and exhibits good mechanical and dynamic properties.

• Filament Winding
• Pressure Moulding
• Pultrusion

• 2 h 248 °F + 8 h 320 °F
• or 2 h 248 °C + 8 h 356 °F

• To simplify the mixing process the resin can be preheated to about 30 °C to 50 °C before adding the cold hardener.
• Hardener and accelerator can be premixed, thus allowing the use of two component mixing/metering equipment. The mix of hardener and accelerator has a shelf life of at least 1 day.
• The impregnation bath should be heated to 35 - 45 °C in order to ensure optimum wetting of fibres. The mandrel should be heated to 60 - 110 °C during the filament winding process.
• The gelation temperature should not be higher than absolutely necessary. A high gelation temperature induces high shrinkage and generates internal stresses.

Interlaminar Shear Strength (ASTM D 2344)

• Short beam: E-glass unidirectional specimen
• Laminate thickness t = 3.2 mm
• Fibre volume content: 59 - 62 %

Shear strength (Cure: [Kpsi] 2 h 248 °F + 8 h 320 °F) - 10.0 – 10.9)

Tensile Test, Transverse Stress 

Test specimens: unidirectionally wound tubes

Test specimens: unidirectionally wound tubes 

Processing Guidelines

• We recommend that the components are weighed with an accurate balance to prevent mixing inaccuracies which can affect the properties of the matrix system.
• The components should be mixed thoroughly to ensure homogeneity. It is important that the side and the bottom of the vessel are incorporated into the mixing process. 

Typical Cure Cycles

2 h 248°F and 8 h 320°F or 2 h 248°C and 8 h 356°F

The optimum cure cycle has to be determined case by case depending on the processing and the economic requirements.

Glass Transition Temperature (TG) (IEC 1006, 10 K/MIN)

Cure temperatures above 266 °F may lead to a brownish colouration of the epoxy system. This colouration does not influence the properties of the system.

Tensile Test (ISO 527)

Flexural Test (ISO 178)

Fracture Properties Bend Notch Test (PM 258-0/90)

Water Absorption (ISO 62)

• ARALDITE® LY 1556 should be stored in a dry place, in the sealed original container, away from heat and humidity, at temperatures between 2°C and 40°C (35.6°F and 104°F). Under these storage conditions, the shelf life is 6 years. The product should not be exposed to direct sunlight. Araldite® LY 1556 which has crystallized and looks cloudy can be restored to its original state by heating to 60 - 80 °C.
• ARADUR® 906 should be stored in a dry place, in the sealed original container, away from heat and humidity, at temperatures between 2°C and 40°C (35.6°F and 104°F). Under these storage conditions, the shelf life is 2 years. The product should not be exposed to direct sunlight. Because Aradur® 906 is sensitive to moisture, storage containers should be ventilated with dry air only.
• ACCELERATOR DY 070 should be stored in a dry place, in the sealed original container, away from heat and humidity, at temperatures between 2°C and 40°C (35.6°F and 104°F). Under these storage conditions, the shelf life is 3 years. The product should not be exposed to direct sunlight. Partly emptied containers should be closed immediately after use.