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Airmix

spraying & equipment

Catalog V5.3

General informations

Spray gunsMachines & Controllers PumpsAccessoriesGeneral informations

Nota: 1 poise = 100 centipoises and 1 mPas.s = 1 centipoise (If the density of the paint is equal as 1 and if it is a uid Newtonien, that is to say no thixotrope).

AFNOR 4 (CA4) ISO 4 mPas.s Centipoises Ford 4 (CF4) DIN 4 (D°) CH (Fr) ZAHN (n°2)

12 - 20 20 10 11 6 18

14 17 25 25 12 12 7 19

16 23 30 30 14 14 - 20

20 34 40 40 18 16 8 22

25 51 50 50 22 20 9 24

29 60 60 60 25 23 10 27

32 68 70 70 28 25 - 30

34 74 80 80 30 26 11 34

37 82 90 90 33 28 12 37

40 93 100 100 35 30 13 41

45 - 120 120 40 34 14 49

50 - 140 140 44 38 15 58

56 - 160 160 50 42 16 66

61 - 180 180 54 45 17 74

66 - 200 200 58 49 18 82

70 - 220 220 62 52 19 -

Paint consistency

Finally, to give the finish specific characteristics, we use a whole range of fillers and additives.

Solvents make it possible to dissolve the other components of the paint, and can be classed into

the following three groups:

Fast solvents : they evaporate extremely quickly, to such an extent that the paint can dry too

quickly, not allowing it enough time to adhere correctly to the surface.

These solvents are never used on their own.

Slow solvents : they evaporate very slowly, allowing the paint to adhere properly. They leave a

soft and smooth finish. Slow solvents are not very widely used because they significantly increase

the drying time.

Medium solvents : they evaporate in a few seconds ; this is enough to ensure good adhesion,

while giving a satisfactory drying time.

In order to make the correct paint, the manufacturer first of all makes a list of the solvents capable

of dissolving all the binders he wishes to include, and then chooses those with a volatility suitable

for the planned method of drying(whether at room-temperature or in an oven). Before application,

paint is often reduced to give a consistency which is ideal for the task.

The consistency of the paint should be adapted for the type of application. It is identified by the extent

of its viscosity, which is expressed in centipoises or by measuring the time in seconds that it takes for

a certain amount of paint to run through a calibrated viscosity cup. There are different viscosity cups

used for measuring the viscosity of paints. The table below shows the relationship between cup size

sand viscosities in Centipoises.

Paint

Viscosity

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