Leneta Company, Inc. 15 Whitney Rd, Mahwah, NJ, 07430 USA

Item TG19 Logicator

This Geometric-Sequence Multi-Notch Applicator serves a number of functions including:

• Single-drawdown exploration of hiding power over a wide application range
• Comparison of wet-to-dry hiding power change
• Examination of the effect of film thickness on drying speed and surface uniformity

Description

This unique drawdown blade applies a series of stripes with thicknesses in equal percentage steps, to permit single-drawdown exploration of the widest practical application range. The individual stripes are identified by “Index” numbers (20 – 48) engraved on the instrument.The Index Numbers are in equal numerical steps corresponding to increments of approximately 20% in notch clearance, film thickness and spreading rate, as shown in the following table:

INDEX NUMBER
              20       24       28       32       36       40       44       48
WET FILM THICKNESS (W.F.T.)*
mils       5.7     4.7       3.9      3.2     2.6      2.2      1.8       1.5
µm       145    120      98        81      67       55       45        37
NOTCH CLEARANCE
mils      10.40  8.56   7.04     5.79   4.76    3.92     3.23     2.65
µm       264     217    179      147    121     100       82        67
SPREADING RATE*
ft²/gal   208   341     414      504    612     744     904     1100

m²/L 
    6.9    8.4    10.2     12.4     15       18       22        27

         * Based on W.F.T. = 55% of Notch Clearance

 

Test Procedure for Exploration of Dry Film Hiding Power: After the applied coating has dried, the operator locates the critical stripe, visually or photometrically, and encircles the parameter of interest. It is generally accepted that the hiding power endpoint is not total visual extinction but a degree of contrast just short of complete hiding, corresponding to a photometric contrast ratio of 0.98.

 

Test Procedure for Comparison of Wet-to-Dry Hiding Power Change: The TG19 conforms with ASTM Method D 5007 Wet-To-Dry Hiding Change. In this standard, the hiding power of the wet film and then of the dry film are observed visually and the percentage increase or decrease is reported. The complete method is available through the ASTM website.

 

Additional information

Film Width

6 in (152 mm)

Stripe Width

0.7 in (17.8 mm)

Weight

1 lb

International Standards

ASTM D 5007 Wet-to-Dry Hiding Change