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Home  >>  Products  >>  Film Thickness  >>  Pfund Wet Film Thickness Gauge
Pfund Wet Film Thickness Gauge

ASTM D1212

Pfund Gauge

The instrument consists of a spherical convex surface which is forced through the wet paint layer. An oversized circular paint spot is formed on the glass lens, corresponding to the sum of the thicknesses of both the original undisturbed paint film and the displaced paint film that wets the glass. A simple 1:1 ratio has been assumed between these two variable thicknesses and used to construct the table furnished with the instrument.

 




TECHNICAL DATA USE MORE INFO PRICE LIST
 

 

Technical Data

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Technical Data
Diameter of Spot (mm) (mm) (mils) S. R. (sq. ft. per gal.)
3 .00225 0.089 18,088
4 .00400 0.157 10,175
5 .00625 0.246 6,512
6 .00900 0.354 4,522
7 .01225 0.483 3,321
8 .01600 0.630 2,543
9 .02025 0.797 2,009
10 .02500 0.984 1,628
11 .03025 1.182 1,345
12 .03600 1.418 1,130
13 .04225 1.660 963
14 .04900 1.930 830
15 .03625 2.214 723
16 .06400 2.520 636
17 .07225 2.850 563
18 .08100 3.185 502
19 .09025 3.550 460
20 .10000 3.937 407
21 .11025 4.34 369
22 .12100 4.75 336
23 .13225 5.21 307
24 .14400 5.67 282
25 .15625 6.15 260
26 .16900 6.66 241
27 .18225 7.16 223
28 .19600 7.71 207
29 .21025 8.28 193
30 .22500 8.85 180
32 .25600 10.04 158
34 .28900 11.38 141
36 .32400 12.75 125
38 .36100 14.21 113

 

Use

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To make a wet film thickness measurement, the gauge is placed as soon as possible on a freshly painted surface and the lens is forced down as far as it will go. After the pressure is released, the gauge is removed from the surface and the diameter of the oversized circular spot is measured, to the nearest millimeter, directly on the scale engraved on the lens. By referring to the Table supplied with the Pfund Paint Film Gauge, the thickness of the paint film in either fractions of millimeters or in mils, as well as the number of square feet which would be covered by one gallon of paint at that same thickness, may be quickly determined.

 

Principle

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The general plan of the Pfund Paint Film Gauge is shown in the diagram. A convex Lens L whose lower surface has a radius of curvature of 250 mm is mounted in a short Tube T1 which slides freely in an outer notched Tube T2. The compression springs S keep the convex surface out of contact with the wet paint film until pressure is applied to the top of T1.

The Pfund Paint Film Gauge is described in detail in “Physical and Chemical Examination of Paints, Varnishes, Lacquers, and Colors” by H.A. Gardner and G.G. Sward, 13th Edition, (1972). It’s also described under “Method B, Pfund Gauge”, in ASTM D 1212 “Measurement of Wet Film Thickness of Paint, Varnish, Lacquer, and Related Products”.

Pfund Diagram

 

Formulas for Making Approximate Calculations

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d = Diameter of oversized paint spot on lens (in mm.)
t = Thickness of undisturbed paint film (in mm.)
S.R. = Spreading rate of paint (in sq. ft. per gal.)
R = Radius of curvature of convex lens surface (250 mm.)
 
Formulas

 

Prices

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Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
WF-PG101 Engraved Scale Pfund Paint Film Gauge $530.00
WF-PG101-01 Engraved replacement lens only (with set of springs and screws) 117.00
WF-PG100-2 Steel Scale only 39.00



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