Measuring the fluoropolymer concentration in a fluoropolymer HFE solvent

By weighing method  

Equipment required:

Precision scale with display accuracy of 0.001g

Scale pan (disposable)

Pulling syringe (reusable)

Procedure:

Put the scale pan and the empty syringe on the scale and note down the weight as tare.

Draw up the fluoropolymer HFE solvent into the syringe and put it with the pan on the scale. Note down the gross total weight

Carefully fill the syringe content into the pan and put aside the syringe.

Allow the pan to dry out for about 10 hours at room temperature, preferably overnight.

Put the dried pan and the syringe on the zero-filled scale. Note down the net weight.

Calculation:

Deduct from both gross and net weights the tare weight and create a ratio in order to compute the percentage.

(Net – Tare) : (Gross – Tare) x 100 = Percentage of solids

The solids content should be of 1.8% up to 2.2%.

Results beyond these limits require additional dosing.

For calculation assistance, please refer to our Excel sheet.

 

By automatic measuring 

The measuring station's purpose is to calculate the fluoropolymer portion in the solvent and to propose amounts to be added in order to restore the preferred fluoropolymer and HFE content.

This measuring method is based on latest sensor technology. If the fluoropolymer content carried in the solvent changes, the solvent's physical properties will change, too. The sensor will detect it. A measuring process takes up to 26 minutes after new material has been pumped into the measuring cell.