|Aquus® CLEAN 491||1.5 - 5.0||70 - 90||Powder||Heavy-duty powder cleaner for steel, hot dip galvanised and electrogalvanised steel. The product is used by immersion.
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Aquus® CLEAN 491 is a heavy-duty powder cleaner for steel, hot dip galvanised and electrogalvanised steel. The product is used by immersion.
Aquus® CLEAN 491
0.1M Sulphuric Acid
Health & Safety:
This product is alkaline. Refer to the Health & Safety data sheet for safe handling and use.
The tank may be of mild steel construction but it is recommended that the fittings are made from stainless steel grade 316S16. This includes the heating elements and any spray nozzles. See a list of suitable equipment here.
Set-up and Testing:
The makeup of the bath should be 25kg of Aquus® CLEAN 491 to every 1000 litres of water. To prepare a new bath, charge the tank to three quarters capacity with clean cold water, heat to 70°C and add enough of the Aquus® CLEAN 491 to satisfy the full capacity. It is advisable to add the Aquus® CLEAN 491 powder in a turbulent area of the tank to ensure adequate and rapid mixing. Mix well and finally top up the tank with clean water and mix well.
The strength of the solution may be varied depending on the amount and type of soil to be removed. Concentration may vary from as low as 15kg up to 50kg per 1000 litres of working solution.
Take a 10 ml sample of diluted Aquus® CLEAN 491 from the tank, add about 5 drops of screened phenolphthalein and titrate with 0.1N sulphuric acid until the pink colour disappears. Note the volume of 0.1N sulphuric acid in ml required. This is referred to as the pointage.
The strength of the ready for use Aquus® CLEAN 491 solution is determined in accordance with the following table:
|Pointage||Litres (kg) AQUUS Clean 491 liquid|
|34||25kg - RECOMMENDED STRENGTH|
An addition of 1.3kg of Aquus® CLEAN 491 per 1000 litres of working solution is required to raise the pointage by one..
The work is immersed in the Aquus® CLEAN 491 for a sufficient time to allow cleaning to be completed, usually between 10 minutes and 20 minutes. The solution is usually operated at a temperature in the range 70 - 90°C and once the optimum temperature has been established it should be maintained..
Following the Aquus® CLEAN 491 stage the work is rinsed with one or two stages of water rinses which are overflowed sufficiently to prevent excessive contamination. Testing and control of rinse stages are covered in Technical Bulletin Number 1.
Aquus® CLEAN 491 solution must not be discharged to main drainage without neutralisation and removal of any separated oils and solids.