A.6 Particle size of the epoxy powder
The equipment required shall consist of the following:
A.6.1.1 Air-jet sieving unit, with vacuum cleaner attachment and 150 µm and 250 µm screens.
A.6.1.2 Balance, accurate to 0,01 g.
A.6.2.1 Weigh the sieve and one screen to the nearest 0,01 g. Place approximately 20 g of epoxy powder onto the top of the screen, and record the weight of the powder to the nearest 0,01 g.
A.6.2.2 Place the sieve into the sieving unit, cover the unit, and secure it. Operate the sieving unit for
3 min and remove the cover.
A.6.2.3 Remove the sieve, and weigh it to the nearest 0,01 g.
A.6.2.4 Calculate the percentage of epoxy powder, Wep, retained on the screen as given in Equation (A.2):
- 0.1 mg resolution
- 220 g Capacity
Air Jet Sieving Unit
- 150 µm and 250 µm screens
- With vacuum cleaner
- Digital display
- Vibration level adjustment
- Digital time setting