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Leneta Leveling Test Blade
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No. LTB-2
Used in ASTM D4062 Test method for "Leveling of Paints by Drawdown Method" - This is a threaded steel rod that functions as a
grooved doctor blade at any part of its circumference.
It produces a film with parallel ridges and valleys
in simulation of brush marks. Critical dimensions
are indicated in Fig. 2. Plastic arms, in conjunction
with straightedge guides, assure rectilinear movement
of the blade. Test advantages compared with
brushout application are speed, reproducibility, and
a regular surface pattern that facilitates evaluation.
It has been demonstrated that the leveling of films
prepared in this manner correlates very well with
brushout leveling.
The diagram shows alternate clearances, in equal
width, of 300 and 100 μm (12 and 4 mils). Since
the wet film thickness laid down by a doctor blade
is about half its clearance, it can be expected that
the Leneta Leveling Test Blade will apply alternate
stripes about 150 and 50 μm (6 and 2 mils) thick. Thus the amplitude of the square wave formed at the
instant of application will be approximately 50 μm (2 mils) and the approximate average wet
film thickness will be 100μm (4 mils). The latter value multiplied by the nonvolatile fraction
by volume, gives the equivalent dry film thickness. See instructions in this section. |
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Details from the engineering drawing |
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Leneta Drawdown Plates
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General Description: A glass clipboard is set firmly on a phenolic plastic panel and
the whole apparatus is mounted on rubber bumpers to prevent sliding while in use. The
drawdown surface is 6mm (1/4 inch) thick polished glass, equal in planarity to fine mirror
glass. A steel clip holds the test chart or panel steady while the drawdown is made. These
devices provide economical and convenient means for making drawdowns of uniform film
thickness. In some cases they are superior to vacuum plates. They are easy to use, easy to
keep clean, and will be found extremely helpful in every paint and coatings laboratory. |
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DP-3 Leneta Scrub Test Drawdown Plate
Glass surface: 7 x 20" (175 x 500mm)
For Drawdown NS on Leneta Scrub Test Panels |

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Test application with a Dow Latex
Film Applicator shown with DP-SE-3
Straight Edge |
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Leneta Straight Edges are designed for mounting on Leneta Drawdown Plates as guides to assure rectilinear movement of the applicator. Lateral positioning is adjustable to accommodate various applicator widths. |
Catch-Papers Form CP-1 /
Size: 3 x 8-1/2" (75 x 215mm)
These are thin lacquered papers that are placed under the bottom edge of a chart or panel
to catch the surplus paint at completion of a drawdown, as shown in the preceding figures.
Their sealed surface facilitates clean-up by preventing fast dry-out of paint on the applicator.
Avoidance of this condition is of special importance when applying emulsion paints with
multi-grooved applicators for sag or leveling tests. Such instruments present a particularly
difficult cleaning problem, and must be kept scrupulously clean for accurate results. |
Pre-Shear Methods and Equipment
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Practical methods for applying coatings develop high shear rates and stresses that strongly
influence the degree of sagging and leveling. Since drawdown blades for measuring these
characteristics develop relatively low rates of shear, they require that coatings be “Pre-Sheared”
to simulate practical application. This can be accomplished by rapid mechanical mixing,
or by forcing the liquid through a suitable hypodermic syringe. In general, the
former is advisable with solvent type and the latter with aqueous coatings. Following is
a description of specific equipment and procedures that have been found satisfactory in
this connection. |
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I – Pre-Shear by Rapid Mixing – Solvent Coatings |
A. Equipment |
- Rotary power mixer, capable of 1300 and/or 3600 rpm
- Mixing can–Pint (500 mL) conventional paint can
- Mixing can–175 mL
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B. Procedure: |
- Stir coating thoroughly with a spatula. Strain if necessary.
- Fill the mixing can approximately half.
- Attach the mixing paddle to the rotary power mixer.
- Set speed at 1300 rpm for the 175 mL can or 3600 rpm for
the 500 mL (pint) can.
- Position paddle about 1/4 inches (6mm) from bottom of
can.
- Mix 1 minute then promptly place about 8 mL of paint in
front of the drawdown blade.
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The Leneta Anti-Sag Meter
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High Range - Item No. ASM-3
Medium Range - Item No. ASM-4
This is a drawdown blade with a series of notches of successively higher clearance. The notch clearance,
is related to the degree of sagging and provides a numerical value referred to as the Anti-Sag Index.
Three clearance ranges are available. Special ranges can be made to order. Development of this instrument was described in the Official Digest, and its versatility for rheological
investigations demonstrated in a later article. The STANDARD Anti-Sag Meter is mandatory for several
U.S. government specifications 3,4.
Picture shows the Anti-Sag Meter in operation and illustrates various items of auxiliary equipment.
References - Official Digest (JCT), October 1962, Official Digest (JCT), January 1964, Fed. Test Method Std. No. 141a, Method 4494, ASTM Standard D3730-78, TT-E-508 Interior alkyd semi-gloss, TT-E-506 Alkyd gloss enamel, TT-P-1511 Interior latex gloss & semi-gloss, TT-I-564 Black stencil ink, ASTM Method D4400 |
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Medium Range Anti-Sag Meter |
Typical application procedure |
Technical Data |
Item No. |
Range |
Used for: |
Notch Clearances* |
ASM-3 |
High |
Solvent-borne Arch. coatings
Industrial O.E.M. coatings
High build coatings
Water-borne Arch. coatings |
μm - 350 400 450 500 625 750 875 1000 1125 1250 1500
Mils - 14 16 18 20 25 30 35 40 45 50 60 |
ASM-4 |
Medium |
μm - 100 150 200 250 300 350 400 450 500 550 600
Mils - 4 6 8 10 12 14 16 18 20 22 24 |
*Wet film thickness is about half of clearance.
The Economy Scale Sagometer correlation is as follows:
Scale C = High, Scale D = Medium |
Anti-Sag Meter Test Method - Practical methods for applying coatings develop high shear rates and stresses that strongly influence the degree of sagging and leveling. Since drawdown blades for measuring these characteristics develop relatively low rates of shear, they require that coatings be “Pre-Sheared” to simulate practical application. This can be accomplished by rapid mechanical mixing, or by forcing the liquid through a suitable hypodermic syringe and needle. In general, the former is advisable with solvent type and the latter with aqueous coatings. Following is a description of specific equipment and procedures that have been found satisfactory in this connection. |
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A. Equipment |
- The Leneta Anti-Sag Meter.
- The Leneta Adjustable Straight Edge.
- The Leneta
Drawdown Plate–Regular.
- Drawdown Charts* Form 7B, black and white; for light
colored paints. Form WB, plain white, for dark colored paints.
- Catch-Papers, Form CP-1.
- Pre-shear equipment.
*With the Low Range Anti-Sag Meter use glass or flat metal panels.
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B. Preparation of Coating |
- Stir thoroughly and adjust to 23°C (73.5°).
- Pre-shear in accordance with
one of the methods furnished and test immediately thereafter.
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C. Application of Coating |
- Attach the straight-edge onto the drawdown plate in suitable position.
- Place a test
chart on the drawdown plate under the clip.
- Place Anti-Sag Meter on the chart, with it's
open side toward operator and it's shoulder against the straight edge.
- Position Catch-Paper
- Place a suitable quantity (8-10mL) of pre-sheared paint directly in front of the
blade and draw down uniformly at about 6" (150mm) per second.
- Promptly fasten the
drawdown chart to a vertical surface, with stripes horizontal and left edge (thinnest stripe) at
the top, and allow to dry in that position.
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D. Rating the Drawdown |
- Note the notch numbers marked on the Anti-Sag Meter and Identify the corresponding
stripes accordingly.
- Ignore the leading and trailing edges, and observe only the central
5-1/2" (140 mm) of blade path corresponding to the black area of Form 7B.
- The lowest
(thickest) stripe that does not touch the one below itself is referred to as the index stripe,
and its notch number is the Anti-Sag Index of the paint.
- For more precise Anti-Sag Index, add to the Index stripe number the product of the post-index clearance step and a fractional
degree to which it has failed to merge with the next lower stripe. The fraction is estimated in
accordance with the following table:
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Technical Data |
Degree of Merger |
Fraction Unmerged |
Complete |
0 |
Somewhat more than half |
0.25 |
Approximately half |
0.50 |
Somewhat less than half |
0.75 |
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Typical Test Pattern
w/ Form 7B |
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The Leneta Magnetic Spray Stand
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Item No. SS-1 - Laboratory spray stands are often unsteady devices, thickly coated with overspray. The Leneta Magnetic
Spray Stand provides stability, tidiness, and general convenience. Its design is simple: two small, but
powerful, pot magnets are mounted at one end of a curved steel rod. The other end of the rod is screwed
into a heavy steel base. Overall height is approximately thirteen inches. Steel panels 6 x 12 inches
and larger are held firmly during spraying and then easily removed. The magnets remain clean, being
protected from over-spray by the panel. Other parts of the device are readily cleaned by soaking in paint
remover or caustic solution. |
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Leneta Magnetic
Spray Stand, No.SS-1,
showing a 6" x 12" steel panel in
position
for spraying. |
Alu-Card in position for
spraying. It hangs from
a small peg on the steel
adapter, steadied
by
side arms to prevent it
from blowing
off in the
spray stream. |
Alu-Card Adapters
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For use with the Magnetic Spray Stand - The Magnetic Spray Stand can be used with Alu-Cards or other non-magnetic panels by employing one
of the steel adapters designed for that purpose. The picture above shows an adapter in use, and describes how
it works. They are available in two sizes, corresponding to the standard sizes in which Alu-Cards are
available. |
Technical Data |
Item Number |
Product Name |
Leneta Paper-Testing InksFor Panel Size |
AD-2 |
Alu-Card Adapter, Size G |
3 x 5-1/2" (76 x 140 mm) |
Leneta ASTM Scrub & Staining Media
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WA-SC-1: Non-Abrasive Type used in ASTM Method D 3450, Test for Washability Properties
WA-SC-2: Abrasive Type used in ASTM Method D 2486, D 4213 and D 3450 Scrub Resistance & Washability Tests |
Leneta-ASTM Scrub Media - These are aqueous dispersions of detergent, cellulosic thickener and
preservative, made in conformance with and approved for use in the indicated
ASTM methods. The abrasive type contains ground silica for accelerated
erosion. The two compounds are representative of the detergent
and abrasive character of commercial cleaning products. Because of the
variable nature of their ingredients, The Leneta Company provides media
adjusted and tested to assure batch-to-batch uniformity. Each container
is fully identified by batch number and shipping date. The contents of
unopened containers are guaranteed standard in performance for a year,
which is highly conservative on the basis of observed package stability. |
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PC-ST-1: Pigmented Type used in ASTM Method D 3450, Test for Washability Properties |
This is a finely ground dispersion of high jet carbon black in a blend of mineral oil
and odorless mineral spirits.
It is specified in ASTM D3450 to meet the laboratory
requirement for a reproducible composition of matter, representative in a general
way of soilants encountered in the field. |
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PC-ST-31: Penetrating Dye Type Recommended for ASTM Method D3258, Test for Stain Resistance
and Porosity |
This is a proprietary composition of pigment and dark-colored dye dispersed
in an organic liquid vehicle. When applied and then removed from a paint
film, the intensity of the resultant stain indicates the degree of film porosity. |
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Both media have perfect package stability and are manufactured and control tested to assure batch to
batch uniformity. Their usefulness extends not only to ASTM tests, but to any soil and stain removal
test procedure. |
Prices
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Item Number |
Product Description |
Pkg Desc. |
Package
Wt. lbs. approx. |
Price |
AP-LTB-2
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Leneta Leveling Test Blade |
1 Each
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2
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$998.00 |
PC-CP-1 |
Leneta Catch Papers, |
1000 |
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57.00 |
DP-DP-3 |
Leneta Scrub Test Drawdown Plate
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1 Each |
5
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294.00 |
AP-ASM-3
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Anti-Sag Meter, High Range
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1 Each
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2
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924.00 |
AP-ASM-4
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Anti-Sag Meter, Medium Range
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1 Each |
2
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924.00 |
PC-SS-1
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Magnetic Spray Stand
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1 Each
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13
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272.00 |
PC-AD-2
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Alu-Card Adapter, Size G |
1 Each
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1
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48.00 |
PC-IP-1B |
Non-Stick Leneta ™ Inter-Leaf Paper 7 5/8 x 11-1/4 |
194 x 286 |
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96.00 |
PC-IP-1C |
Non-Stick Leneta ™ Inter-Leaf Paper 7 5/8 x 10-1/4 |
194 x 260 |
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89.00 |
PC-IP-1A |
Non-Stick Leneta ™ Inter-Leaf Paper 5 1/2 x 10 |
140 x 254 |
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73.00 |
WA-SC-1
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Scrub Medium, Non-Abrasive Type
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Pint jar
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2
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36.00 Jar |
WA-SC-2
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Scrub Medium, Abrasive Type
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Pint jar
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2 |
36.00 Jar |
PC-ST-1 |
Staining Medium
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1/4 pint jar
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1
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34.00 Jar |
PC-ST-31
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Staining Medium |
1/4 pint jar
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1
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52.00 Jar |
Ask for quantity break & inquire about items not listed |
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