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Home > Products > Dispersion > Fineness of Grind Gauges
Fineness of Grind Gauges

In its simplest conception, a Fineness of Grind Gauge may be considered essentially a continuous variable screen. It can be readily seen that if a material such as fine silica were distributed uniformly in a single particle thickness in the gage path, these particles would protrude above the sides of the path starting at whatever point that their physical size exceeded the depth of the path.

If a straight edge scraper was brought to bear on the sides of the path in conjunction with the deepest part, and then moved slowly down the path to the shallow end, it would contact the protruding particles and on continued movement, screen or push these particles from the path.


Fineness of Grind GagesUSA

The Fineness of Grind Gauge can be used for checking the particle size in a paste. The sample paste is used just as it comes from the grinding machine, but first permitted to cool to room temperature. When this is done, it will be found that reading the gauge has been reduced to the simple task of observing where the coarse particles have been screened out, their path being a definite scratch in the paste matrix. Since most pastes show little fluidity in such a thin film, most materials will dry in the path before confluence erases the scratches. Little difficulty is experienced in obtaining agreement between various trained personnel regarding readings taken by this method.


Materials
Steel
Tool Steel, hardened, with/Black Oxide sides and back.

Chrome Plated
Fineness of Grind Gauges are steel gages which have been flash-chrome plated primarily to double the wear-life of the gage

Stainless Steel
Gauges are made from special stainless forgings of AISI Type 440-C stainless steel. While 440-C does not present the optimum qualities in a stainless steel, it is a type of stainless which can be hardened; hardening is a very necessary characteristic for wear-life. While steel and chrome gauges have a hardness of approximately 60 Rockwell C, stainless steel gauges have a somewhat lower hardness range of approximately 58 Rockwell C scale.

Scrapers
are made of stainless (440-C) or chrome plated tool steel.
Fineness of Grind Gages
Gage In Use

Care of Grind Gages
Clean the gauge after each use. Use a solvent and a soft cloth. Keep the gauge covered or encased at all times when not in use. Protect gages that lie idle for extended periods of time from rust with an oil coating or oil soaked wrap.

Fineness of Grind Scale

Fineness of Grind Scale


Specifications
Item No. Block Size Path Size Paths Scales Range Description
25 1/2 x 2-1/2 x 4-3/4 1/2 x 2 2 Hegman
Mils
8-0
0-5
Group of gauges most commonly referred to as "Hegman Gauges" and are used for a wide variety of paints and other compounds.
45 1/2 x 2-1/2 x 6-3/4 1/2 x 4 2 Hegman
Mils
8-0
0-5
65 3/4 x 2-1/2 x 8 1/2 x 6 2 Hegman
Mils
8-0
0-5
5251 1/2 x 2-1/2 x 6-3/4 1/2 x 5 2 Microns
Mils
Hegman
0-25
0-1
8-6
The group of gauges commonly referred to as "Paint Club Gauges" and are most often used for paints, varnishes, and lacquers. See ASTM Test Method D-1210, also Federal Test Method 141, Method 4411
5252 1/2 x 2-1/2 x 6-3/4 1/2 x 5 2 Microns
Mils
Hegman
0-50
0-2
8-4
5254 1/2 x 2-1/2 x 6-3/4 1/2 x 5 2 Microns
Mils
Hegman
0-100
0-4
8-0
51 3/4 x 3-1/2 x 7-1/2 2 x 5 1 Hegman
Microns
8-6
0-25
These Gauges have a single wide path which aids in the discerning of contamination. These are popular gauges where "wet" master samples are not used for comparison.
52 3/4 x 3-1/2 x 7-1/2 2 x 5 1 Hegman
Microns
8-4
0-50
54 3/4 x 3-1/2 x 7-1/2 2 x 5 1 Hegman
Microns
8-0
0-100
625- 1/2-MU 1 x 3-1/2 x 9-1/2 1 x 6-1/4 2 Microns 0-12-1/2 Popular in foreign usage because of large size and micron calibration. This group includes the shallowest gauge which is 12-1/2 microns, total range.
6251 1 x 3-1/2 x 9-1/2 1 x 6-1/2 2 Hegman
Microns
8-6
0-25
6252 1 x 3-1/2 x 9-1/2 1 x 6-1/2 2 Hegman
Microns
8-4
0-50
6254 1 x 3-1/2 x 9-1/2 1 x 6-1/2 2 Hegman
Microns
8 - 0
0 - 100
PD-250 1 x 3-1/2 x 9-1/2 1 x 6-1/2 2 Microns
Microns
0-50
0-250
Vinyl Dispersion Gauge SPI-VD-10
PB-20 1 x 2-1/2 x 9-1/2 1/2 x 8 2 Mils 0-20 Peanut Butter Gauge
PB-30 1 x 2-1/2 x 9-1/2 1/2 x 8 2 Mils 0-30
PB-40 1 x 2-1/2 x 9-1/2 1/2 x 8 2 Mils 0-40
PH-125 1 x 1-1/2 x 8 1/2 x 6 1 Microns 0-125 Pharmaceutical Gauge
CMA-185 1-1/4 x 2-1/2 x 12 1/2 x 10-1/2 2 Microns
Microns
0-105
80-185
Chocolate Gauge, Chocolate Manufacturer's Association
G-1 1 x 3-1/2 x 9-1/2 1 x 6-1/2 2 NPIRI 0-10 Microns 0 - 25 NIPRI Production Grindometer
G-2 1 x 3-1/2 x 9-1/2 1 x 6-1/2 2 NPIRI 0-20 Microns 0 - 50 Modified Ink gages & Courser
G-3 1 x 3-1/2 x 9-1/2 1 x 6-1/2 2 NPIRI 0-30 Microns 0 - 75
SI-1 3/4 x 2-1/2 x 8 1/2 x 6-1/4 2 NPIRI 0-10 Microns 0 - 25 Small Ink gages
SI-2 3/4 x 2-1/2 x 8 1/2 x 6-1/4 2 NPIRI 0-20 Microns 0 - 50
SI-3 3/4 x 2-1/2 x 8 1/2 x 6-1/4 2 NPIRI 0-30 Microns 0 - 75

 

Specifications of Fineness of Grind Gauges
Paint Club Scale
The Paint Club Scale is similar to the Hegman Scale in that it also has a range of .004 inches; however, this range is divided into ten parts instead of eight parts. The "0" is at the .004 inches depth and the "10" is at the infinite point on the path. This scale was developed by, and is recommended by, the New York Paint Club, Subcommittee No. 23.

Mils Scale
The Mils Scale has been the common denominator through which we have interpreted other scales. On Fineness of Grind Gauges 1 Mil equals .001 inches.

Microns
For our purpose on Fineness of Grind Gauges, one Micron has been rounded to .00004. Thus, one Mil equals 25 Microns.

The NPIRI Scale
The NPIRI Scale is a scale designed for ink gauge by the National Printing Ink Research Institute. The scale begins with "0" at the infinite point and extends to "10" at a depth of .001 inches. While it is an arbitrary scale, it is a logical one in that these divisions are equivalent of tenths of mils, or 2-1/2 microns. This scale has been extended for use on Modified Ink Gauges of greater range which are used by some companies for premix control and inks having particles or agglomerates outside the range of the NPIRI Production Grindometer.

Grind Gauge Scraper Specifications
Catalog Number Thickness, Width, & Length Description
A-1 1/4 x 1-1/2 x 3-3/4 Two edges with .015 radius making line contact.
A-3 3/8 x 1-1/2 x 4-5/8 Used with 4" and 4-1/2" gauges.
A-4 3/8 x 1-1/2 x 6-3/4 Used with FPBAA-C and some special gages.
IA-1 1/4 x 3-5/8 Wide with insulated handle for use with heated gages
B-1 2-1/2" Block type scraper for wide gauges, one flat edge.
B-2 3-1/2" Block type scraper for wide gauges, one flat edge.
B-3 4-1/2" Block type scraper for wide printing plates, one flat edge.
WB-S Warren Block Scraper for 4" wedge plate

  1. Block sizes shown are approximate.
  2. Path length shown is the length of the calibrated section only.
  3. Hegman Scale is designated “NS” on gauges manufactured prior to 1969.
  4. Hegman Scale is designated “H” on gauges manufactured after 1968.
  5. Though one micron equals .00003937 inches, we have rounded off to .00004 inches for calibration.
  6. All gauges and wedge plates are supplied with adco stype scrapers (A1, A3, or A4) in correct width.

Uses
Cosmetics
Ceramics
Clays
Adhesives
Chocolates
Dyes
Talcs

Resins
Silicates
Flours
Carbon Blacks
Micas
Oxide Coatings
Plastisols
Paint & Varnish
Inks
Chemicals
Peanut Butter
Pharmaceuticals
Phosphorescents
Paper Coatings

Specifications References
  • ASTM D 1210
  • ASTM D 1316
  • ASTM D 333
  • FTMS 141a Method 4411.1
  • DIN 53-203
  • ISO 1524
  • BS3900: Part C6

Available Items - Literature
Order numbers are created by using the Item number PLUS the material type abbreviation which is designated in parenthesis.

Note: Each gauge is furnished with a scraper and plastic pouch case, except CMA & CI-1 gauges are not furnished with a Case.
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 Steel (TS) Chrome (CH) #440-C (SS)
FG-25( ) P.O.R. P.O.R. $462.00
FG-45( ) 462.00
FG-65( ) 501.00
FG-51( ) 501.00
FG-52( ) 501.00
FG-54( ) 501.00
FG-5251( ) 501.00
FG-5252( ) 501.00
FG-5254( ) 501.00
FG-6251( ) 638.00
FG-6252( ) 638.00
FG-6254( ) 638.00
FG-625-1/2( ) 656.00
FG-G-1( ) 659.00
FG-G-2( ) 659.00
FG-G-3( ) 659.00
FG-SI-1( ) 517.00
FG-SI-2( ) 517.00
FG-SI-3( ) 517.00
FG-PD-250( ) 680.00
FG-PB-20( ) N/A 702.00
FG-PB-30( ) 763.00
FG-PB-40( ) 824.00
FG-PH-125( ) 501.00
FG-CMA-185( ) 835.00
Scrapers
FG-A-1( ) N/A 146.00
FG-A-3( ) 255.00
FG-A-4( ) 391.00
FG-IA-1( ) 517.00
FG-B-1( ) 365.00
FG-B-2( ) 365.00
FG-B-3( ) 371.00
FG-WB-S 371.00
Also Available: Prices
Wood Cases, 3-1/2" wide gauges P.O.R.
Soft Plastic Case for Scraper P.O.R.
Soft Plastic Gauge Cases P.O.R.

Gauges are furnished with a vinyl pouch for both gauge & scraper. All other grind gauges (except for CMA185) get a vinyl case. All 3-1/2" by 9-1/2" Gauges are furnished with a wood case.

When purchasing a new gage, block-style scrapers in 440-C may be substituted for A-1 or A-3 scrapes.

Any block-style scraper for a plate larger than 4" can be quoted separately as a special order.

Click here for an article on "Reading the Hegman Grind Gage".

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