If there is to be a delay between the pretreatment and bonding of aluminium, the pretreated surface should be protected with

Redux? 119 surface pretreatment protection solution to conserve the optimum bonding surface. This will enable bonding to be

delayed for up to 2 months without deterioration of the pretreated surface. The correct application of Redux? 119 should not alter the

bonding performance of Redux? 319 (for full application details consult the relevant data sheet).

Application

1. If stored cold allow sufficient time for the adhesive to warm to room temperature (19 - 27°C) before removing the protective

polythene.

2. Cut the film to the shape and size required.

3. Remove the release paper and position the adhesive on the prepared bonding surface.

4. Remove the polythene backing sheet.

5. Complete the joint assembly and apply pressure while the adhesive is being cured. For sandwich structures the pressure

application should be selected to suit the type of core used.

Curing

Redux? 319 adhesives should be cured at 175 ± 5°C for 60 minutes to obtain optimum properties. Enough time should be allowed

for heat to penetrate through the assembled parts to ensure that the adhesive reaches that temperature before timing starts. A cure

pressure of around 140 - 700 kPa and heat up rate of approximately 5°C per minute is recommended during cure. After curing it is

recommended that components are cooled to below 70°C before releasing the pressure.

Mechanical Properties

All the performance values given in this data sheet are based on experimental, routine Quality Control and Specification testing

results obtained under laboratory conditions. They are typical values expected for the Redux? 319 series prepared and cured as

recommended and under the conditions indicated. They do not and should not constitute specification minima.

Metal Bonding Strengths

Redux? 319 series adhesives were used to bond Alclad 2024-T3 aluminium test specimens; the aluminium was pretreated

(chromated/sulphuric acid pickling) in accordance with Method O of BSI Code of Practice CP 3012 (Method O of DEF Standard 03-2/1).

The honeycomb tests used HexWeb? 7.9-1/4-40 (5052) T aluminium honeycomb