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Home  >>  Products  >>  Application  >>  Wet Film App Rods
Wet Film Applicator Rods

Wire-Wound Lab Rods and Custom Production Rods*
*Ask for a quote with your specific requirments

Wet Film Applicator Rods

 

Design and Construction

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Wet Film Applicator Rods

The Gardco Applicator Rod is a round stainless steel bar tightly wound with stainless steel wire. The diameter of the rod and wire vary in size depending on type of application.

The diameter of the wire, in the wound form, regulates the thickness of the coating. During the manufacturing process, tight tolerances are held along with strict quality control. Every item is 100% inspected and individually packaged.

 

Technical Data

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Technical Data
Core 303 Stainless Steel
Wire 302 Stainless Steel
Core Diameter: +0 to -0.5 mils
Wire Diameter:  +0 to -0.5 mils
Core Straightness:  0.006”/ 12”

 

Theory and Principle

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The coating thickness is governed by the area of the groove between the coils of wire as shown in the diagram. This groove or space allows the right amount of coating to pass through. The amount that has passed through flows out or congeals, leaving a smooth, uniform thickness on the substrate. The groove area is determined by the size of the wire, hence, the larger the wire, the larger the groove. Accurate thickness of coating from fractions of a mil and up can be achieved with this coating method. The desired thickness can be repeated again and again with little loss of time and expense. Applicator Rods are available in any length, a variety of diameters and almost any wire size. They are manufactured of ground and polished steel and the very finest of wires.

 

Applications

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  • Adhesives
  • Board
  • Cellulose
  • Ceramic Colors
  • Cosmetics
  • Driers
  • Duplicating Inks
  • Emulsions
  • Fillers
  • Floor Polishes
  • Lacquers
  • Metallic Powders
  • Oils
  • Paper
  • Photographic Papers
  • Pigments
  • Plastics
  • Printing Inks
  • Resins
  • Varnishes
  • Waxes & Hotmelts

 

Use and Procedure

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Drawdowns are an inexpensive method of making laboratory samples to determine coating thickness, substrate penetration, fluid compatibility, bond strength, etc. Drawdown rods enable the technician to perform these tests with a minimum of effort. The procedure is as follows:
 
Drawdown In Use
Drawdown Plate and Rod
  1. Attach (or tape) a sample of the most suitable substrate to the glass surface of the Drawdown Plate.

  2. Using a spatula, place a small pool of coating liquid near the top of the sample sheet.

  3. Immediately grasp the ends of the Drawdown Rod. Using the thumbs of both hands to keep the rod from bowing or bending away from the sample, draw the rod down through the liquid pool spreading and metering the fluid across the sample sheet. As the drawdown is made, note the behavior of the coating and any possible reaction with the substrate. (Note: It may be convenient to construct a small trough of cardboard to catch the excess liquid as it is drawn to the bottom edge of the drawdown board.) Immerse rod in Cleaning Tray after use.

  4. The coated sample is now ready for testing.

  5. If the coating application is too thin, use a rod with a larger diameter wire. Hence, if the coating is too thick, use a rod with a smaller diameter wire (See "Conversion Chart For Wet Film Thickness" & How To Order Rods)
 

The wet film thickness conversion chart shows the wet film thickness that may be obtained from a given wire size. However it is impossible to chart exact film thickness for all coatings since there are so many variables. The wet film thickness is based on 100% solids, no evaporation, no penetration into the substrate. Rod diameter and rod pressure may also affect film thickness. The chart is intended to serve as a guide only in selecting wire size.

Applicator Rods are priced according to rod diameter, film path width and wire size. However, when ordering, please provide the above information. Unless otherwise indicated, overall length will be film path plus 4”. NOTE: Standard applicators are for 12” film path.

 

Warranty

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Paul Gardner Company warranties their products to be free of defects in materials and workmanship. No warranty of merchantability or other warranty, express or implied, is made. Liability for and the exclusive remedy for defective materials or workmanship is limited to replacement or repair of defective parts returned within 15 days after receipt (except where the defect is not immediately ascertainable, in which case return shall be made within 30 days after receipt). No allowance will be made for repairs performed by the purchaser or on his order. Paul Gardner Company is not liable for consequential or other damages or any expense incurred through the use of its products.

 

Order Instructions

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Video

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1/4" Diameter Rods

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12" Drawdown Path Standard 16" All Stainless Steel Lab Rod (1/4" Diameter). Note: Many other sizes available

1/4


1/4" 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.
Wire Size Wire Dia.
(Inches)
Prices Wire Size Wire Dia.
(Inches)
Prices Wire Size Wire Dia.
(Inches)
Prices
#0* .000 $34.00 15 .015 $44.00 38 .038 $47.00
2-1/2 .0025 58.00 16 .016 44.00 40 .040 47.00
3 .003 51.00 17 .017 44.00 42 .042 49.00
4 .004 51.00 18 .018 44.00 44 .044 49.00
5 .005 51.00 19 .019 44.00 46 .046 49.00
6 .006 51.00 20 .020 44.00 48 .048 49.00
7 .007 51.00 22 .022 44.00 50 .050 51.00
8 .008 51.00 24 .024 44.00 52 .052 51.00
9 .009 47.00 26 .026 44.00 54 .054 51.00
10 .010 47.00 28 .028 44.00 56 .056 51.00
11 .011 47.00 30 .030 47.00 58 .058 53.00
12 .012 47.00 32 .032 47.00 60 .060 53.00
13 .013 47.00 34 .034 47.00 *No wire, smoothing rod.
14 .014 47.00 36 .036 47.00
1/4" rods not available in wire sizes 62 through 75. See 1/2"or 3/8 diameter rods.
See Formed Rods Page for additional sizes.

Applicators Rods are non-returnable items. Subject to final sale.
See "Conversion Chart For Wet Film Thickness" & How To Order Rods
Click here to see our Gardco Bench Rack

 

3/8" Diameter Rods

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12" Drawdown Path - Standard 16" All Stainless Steel Lab Rod (3/8" Diameter)

3/8


3/8" 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.
Wire Size Wire Dia.
(Inches)
Prices   Wire Size Wire Dia.
(Inches)
Prices   Wire Size Wire Dia.
(Inches)
Prices   Wire Size Wire Dia.
(Inches)
Prices
#0* .000 $45.00 13 .013 $67.00 30 .030 $65.00 54 .054 $70.00
2-1/2 .0025 99.00 14 .014 67.00 32 .032 65.00 56 .056 70.00
3 .003 80.00 15 .015 62.00 34 .034 65.00 58 .058 70.00
4 .004 77.00 16 .016 62.00 36 .036 65.00 60 .060 73.00
5 .005 71.00 17 .017 62.00 38 .038 65.00 62 .062 73.00
6 .006 67.00 18 .018 62.00 40 .040 65.00 64 .064 73.00
7 .007 67.00 19 .019 62.00 42 .042 70.00 65 .065 73.00
8 .008 67.00 20 .020 62.00 44 .044 70.00 70 .070 75.00
9 .009 67.00 22 .022 62.00 46 .046 70.00 75 .075 75.00
10 .010 67.00 24 .024 62.00 48 .048 70.00 *No wire, smoothing rod.
11 .011 67.00 26 .026 62.00 50 .050 70.00
12 .012 67.00 28 .028 62.00 52 .052 70.00
Applicators Rods are non-returnable items. Subject to final sale.
For wire equivalent sizes 76-95 click to see Formed Rods Page
See "Conversion Chart For Wet Film Thickness" & How To Order Rods
Click here to see our Gardco Bench Rack

 

1/2" Diameter Rods

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12" Drawdown Path, Standard 16" All Stainless Steel Lab Rod (1/2" Diameter)

1/2


1/2" 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.
Wire Size Wire Dia.
(Inches)
Prices   Wire Size Wire Dia.
(Inches)
Prices   Wire Size Wire Dia.
(Inches)
Prices   Wire Size Wire Dia.
(Inches)
Prices
#0* .000 $44.00 13 .013 $78.00 30 .030 $73.00 54 .054 $79.00
2-1/2 .0025 106.00 14 .014 78.00 32 .032 73.00 56 .056 79.00
3 .003 88.00 15 .015 69.00 34 .034 73.00 58 .058 79.00
4 .004 88.00 16 .016 69.00 36 .036 73.00 60 .060 79.00
5 .005 78.00 17 .017 69.00 38 .038 73.00 62 .062 79.00
6 .006 78.00 18 .018 69.00 40 .040 73.00 64 .064 79.00
7 .007 78.00 19 .019 69.00 42 .042 73.00 65 .065 79.00
8 .008 78.00 20 .020 69.00 44 .044 73.00 70 .070 82.00
9 .009 78.00 22 .022 69.00 46 .046 73.00 75 .075 82.00
10 .010 78.00 24 .024 69.00 48 .048 73.00 *No wire, smoothing rod.
11 .011 78.00 26 .026 69.00 50 .050 79.00
12 .012 78.00 28 .028 69.00 52 .052 79.00
Applicators Rods are non-returnable items. Subject to final sale.
For wire equivalent sizes 76-95 click to see Formed Rods Page
See "Conversion Chart For Wet Film Thickness" & How To Order Rods
Click here to see our Gardco Bench Rack

 

 

 

Twin & Gapped Drawdown Rods

Coating Patterns

For those applications where heavier coatings are required, use these special drawdown rods with two wires. A standard single-wire rod is over-wound with a second, smaller wire which follows the spiral of the base wire.

The result is a modified groove between the wires that will produce wet coatings up to 11 mils (.011") thick.

 

Twin-Coat Rods

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Twin-Coat Rods: Another advantage is that a two-wire rod, used instead of a conventional single-wire rod, will have more than twice as many "grooves" for a given coating thickness.

This results in taller raised striations which are affected more quickly by surface tension, and flatten out to a glass-like surface in a shorter time span.

TwinCoat Rod

TriCoat Rod

 

Typical Twin-Coat Wire Combinations

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Technical Data
Wet Film Thickness Twin-Coat Wire Size
.001" 3/8
.002" 6/10
.003" 10/14
.004" 12/19
.005" 15/24
.006" 17/30
.007" 19/40
.008" 24/38
.009" 26/44
.010" 30/48
.011" 30/62
Applicators Rods are non-returnable items. Subject to final sale.

 

Gapped Rods

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Gapped Rods: For higher viscosity coatings, gapped rods reduce clogging and eliminate lines. By winding a smaller wire with spacing (see image) the cavity created is wide and shallow allowing heavy coatings to flow better.

A smaller wire creates a smaller interruption in the coating flow enabling the coating to wet out more completely. While a gapped rod is less durable than a twin coat rod, it is usually less expensive.

Gapped Rods are used for coatings up to 25 mils (.025") thick. Please contact us for pricing.

Gapped Rod




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