International Starch Institute: Comparison of US / metric Sieves

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International Starch Institute
Science Park Aarhus, Denmark
Sieve Table

Sieve Comparison Table

ISO 565 1987	DIN 4188 1977	US Std/ASTM E-11-1987	Tyler^Ž	BS 410 1986
mm	mm	US Mesh	Mesh	Equivalent BS Mesh
		Inch	Inch
		3" .
		2".
26,5	25	1.06"	1.05".
25	22,4	1"
22,4	20	7/8"	0.883"
19	18	3/4"	0.742"
16	16	5/8"	0.624"
13,2	14	0.530"
12,5	12,5	1/2 "
11,2	11,2	7/16"	0.441"
9,5	10	3/8"	0.371"
	9
			Mesh
8	8	5/16"	2.5
6,7	7,1	0.265"	3
6,3	6,3	1/4"
		Mesh
5,6	5,6	3˝	3.5	3
4,75	5	4		3˝
	4,5
4	4	5	5	4
3,35	3,55	6		5
	3,15
2,8	2,8	7		6
2,36	2,5	8	8	7
	2,24
2	2	10		8
1,7	1,8	12	10	10
	1,6
1,4	1,4	14	12	12
1,18	1,25	16	14	14
	1,12
1	1,0	18	16	16
Microns (ľm)	Microns (ľm)
850	900			18
	800	20	20
710	710	25	24	22
	630
600		30	28	25
	560
500	500	35	32	30
	450
425	430	40	35	36
	400
355	355	45	42	44
	315
300		50	48	52
	280
250	250	60	60	60
212	224	70	65	72
	200
180	180	80	80	85
	160
150		100		100
	140
125	125	120	115	120
106	112	140	150	150
	100
90	90	170	170	170
	80
75		200	200	200
	71
63	63	230	250	240
53	56	270	270	300
	50
45	45	325	325	350
38	40	400	400	400
	36
32	32	450	450	440
25	25	500	500
20	20	635	635
16	16
10	10

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MARKET GRADE WIRE CLOTH

MARKET GRADE WIRE CLOTH is woven utilising moderate wire diameters resulting in a high strength square mesh cloth, suitable for general purpose screening. Market Grade wire cloth is woven in Steel, Stainless Steel, Phosphor Bronze, Bronze, Brass, Copper, Aluminium, Monel and Nickel.

Meshes Per Linear Inch	Diameter of Wire		Width of Opening		Open Area
Meshes Per Linear Inch	Inches	mm	Inches	mm	Open Area
2 Mesh	0.063	1.60	0.437	11.10	76.4%
3 Mesh	0.054	1.37	0.279	7.09	70.1%
4 Mesh	0.047	1.19	0.203	5.16	65.9%
5 Mesh	0.041	1.04	0.159	4.04	63.2%
6 Mesh	0.035	0.89	0.132	3.35	62.7%
8 Mesh	0.028	0.71	0.097	2.46	60.2%
10 Mesh	0.025	0.64	0.075	1.91	56.3%
12 Mesh	0.023	0.584	0.060	1.52	51.8%
14 Mesh	0.020	0.508	0.051	1.30	51.0%
16 Mesh	0.018	0.457	0.0445	1.13	50.7%
18 Mesh	0.017	0.432	0.0386	0.98	48.3%
20 Mesh	0.016	0.406	0.0340	0.86	46.2%
22 Mesh	0.015	0.381	0.0305	0.78	45.0%
24 Mesh	0.014	0.356	0.0277	0.70	44.2%
30 Mesh	0.013	0.330	0.0203	0.52	37.1%
35 Mesh	0.011	0.279	0.0176	0.45	37.9%
40 Mesh	0.010	0.254	0.0150	0.38	36.0%
45 Mesh	0.0095	0.241	0.0127	0.32	32.7%
50 Mesh	0.009	0.229	0.0110	0.28	30.3%
60 Mesh	0.008	0.203	0.0087	0.22	27.2%
70 Mesh	0.007	0.178	0.0073	0.19	26.1%
80 Mesh	0.0055	0.140	0.0070	0.18	31.4%
90 Mesh	0.005	0.127	0.0061	0.16	30.1%
100 Mesh	0.0045	0.114	0.0055	0.14	30.3%
110 Mesh	0.004	0.102	0.0051	0.129	31.4%
120 Mesh	0.0037	0.094	0.0046	0.1168	30.7%
150 Mesh	0.0026	0.066	0.0041	0.1041	37.4%
200 Mesh	0.0021	0.054	0.0029	0.0737	33.6%
325 Mesh	0.0014	0.036	0.0017	0.043	30.0%

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MILL GRADE SCREEN CLOTH

Mill Grade is wire cloth woven of lighter wire diameters than Market Grade, providing a greater percentage of screen cloth open area.

Meshes Per Linear Inch	Diameter of Wire		Width of Opening		Open Area
Meshes Per Linear Inch	Inches	mm	Inches	mm	Open Area
2 Mesh	0.0540"	1.37	0.446"	11.33	79.6%
3 Mesh	0.0410"	1.04	0.292"	7.42	76.7%
4 Mesh	0.0350"	0.89	0.215"	5.46	74.0%
5 Mesh	0.0320"	0.81	0.168"	4.27	70.6%
6 Mesh	0.0280"	0.71	0.139"	3.53	69.6%
7 Mesh	0.0280"	0.71	0.115"	2.92	64.8%
8 Mesh	0.0250"	0.64	0.100"	2.54	64.0%
9 Mesh	0.0230"	0.58	0.088"	2.24	62.7%
10 Mesh	0.0200"	0.51	0.080"	2.03	64.0%
12 Mesh	0.0180"	0.457	0.065"	1.65	60.8%
14 Mesh	0.0170"	0.432	0.054"	1.37	57.2%
16 Mesh	0.0160"	0.406	0.0465"	1.18	55.4%
18 Mesh	0.0150"	0.381	0.0406"	1.03	53.4%
20 Mesh	0.0140"	0.356	0.0360"	0.91	51.8%
22 Mesh	0.0135"	0.343	0.0320"	0.81	49.6%
24 Mesh	0.0130"	0.330	0.0287"	0.73	47.4%
26 Mesh	0.0110"	0.279	0.0275"	0.70	51.1%
28 Mesh	0.0100"	0.254	0.0257"	0.65	51.8%
30 Mesh	0.0095"	0.241	0.0238"	0.61	51.0%
32 Mesh	0.0090"	0.229	0.0223"	0.57	50.9%
34 Mesh	0.0090"	0.229	0.0204"	0.52	48.1%
36 Mesh	0.0090"	0.229	0.0188"	0.48	45.8%
38 Mesh	0.0085"	0.216	0.0178"	0.45	45.8%
40 Mesh	0.0085"	0.216	0.0165"	0.42	43.6%
45 Mesh	0.0080"	0.203	0.0142"	0.36	40.8%
50 Mesh	0.0075"	0.191	0.0125"	0.32	39.1%
55 Mesh	0.0070"	0.178	0.0112"	0.28	37.9%
60 Mesh	0.0065"	0.165	0.0102"	0.26	37.5%

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FINE MESH WIRE CLOTH TWILLED WEAVES

Meshes Per Linear Inch	Diameter of Wire		Width of Opening		Percent Open Area
Meshes Per Linear Inch	Inches	mm	Inches	mm	Percent Open Area
110 Mesh	0.0045"	0.114	0.0046"	0.1168	25.6%
120 Mesh	0.0040"	0.102	0.0043"	0.1092	26.8%
130 Mesh	0.0038"	0.097	0.0039"	0.0991	25.6%
140 Mesh	0.0033"	0.084	0.0038"	0.0965	28.6%
150 Mesh	0.0030"	0.076	0.0037"	0.0940	30.4%
160 Mesh	0.0028"	0.071	0.0035"	0.0889	30.8%
170 Mesh	0.0026"	0.066	0.0033"	0.0838	31.2%
180 Mesh	0.0025"	0.064	0.0031"	0.0787	30.6%
200 Mesh	0.0023"	0.059	0.0027"	0.0686	29.1%
230 Mesh	0.0018"	0.046	0.0025"	0.0647	34.3%
250 Mesh	0.0016"	0.041	0.0024"	0.0610	36.0%
270 Mesh	0.0016"	0.041	0.0021"	0.0533	32.2%
300 Mesh	0.0015"	0.038	0.0018"	0.0457	29.7%
325 Mesh	0.0014"	0.036	0.0017"	0.0432	30.7%
400 Mesh	0.0010"	0.026	0.0015"	0.0381	36.0%

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DICTIONARY

absolute micron retention	In both types of Dutch weave the sum derived from multiplying the number of weft wires in a given measurement by their diameter, results, in theory, in a specification with no open space. Because the wires are driven together during the weaving process, the aperture size cannot be calculated in the normal manner. There are two methods by which the aperture size can be determined: bubble point testing and glass bead testing. See-"bubble point test" See-"glass bead test"
ACS	American Chemical Society.
AICHE	American Institute of Chemical Engineers
AIME	American Institute of Mining, Metallurgical and Petroleum Engineers.
anneal	A heat-treating process in which the steel is heated to some elevated temperature, usually at or near the critical range and held at this temperature for a period of time, then cooled, usually at a slow rate. Annealing is employed (1) to soften steel for secondary machining or forming processes; (2) to alter ductility, toughness, electrical or magnetic characteristics or other physical properties; (3) to refine the crystal structure; (4) to produce grain reorientation; or (5) to relieve stresses and hardness resulting from weaving (cold working).
annealed after	Wire cloth or wire mesh which is annealed after the weaving process.
annealed wire	Wire which has been cold-drawn to reduce its diameter is often annealed to reduce strength and increase elongation to facilitate weaving.
ANSI	American National Standards Institute.
aperture	The clear opening between wires on a wire mesh screening surface.
ASME	American Society of Mechanical Engineers.
ASTM	American Society for Testing and Materials. ASTM E-11 is the standard most widely used in North America. The opening is defined by a number (number 635 (20 ľm) to number 3-1/2 (5.6 mm)) or is defined in inches (1/4 in. (6.3 mm) to 5 in. (125 mm)).
AWCI	American Wire Cloth Institute.
A.W.G.	American Standard Wire Gauge.
AWS	American Welding Society.
backing cloth	Wire mesh or wire cloth which is utilised to provide support for a screen surface.
backing screen	Wire mesh or wire cloth fabricated with or otherwise fastened to (from below) the primary screen surface. See-"support screen".
ball screen	Wire mesh or wire cloth screen placed below the primary screen surface to retain rubber or steel balls or plastic discs which are set in motion by a vibrating screen deck. Ball screens are utilised to reduce or prevent blinding or plugging.
blinding	Filling in and clogging of the wire mesh openings (apertures) due to particle entrapment of the process material. The wire cloth becomes "blind" to the process flow.
BMT	Abbreviation for "Broad Mesh Twilled Dutch Weave"
Bolting Cloth	A group of industrial wire cloth specifications, woven in very smooth and durable stainless steel or monel in a plain square mesh pattern. Wire diameter is lighter than "mill grade", allowing a high percentage of open area. Bolting cloth is used for wet or dry sifting and separating.
bran duster cloth	Plain weave steel wire cloth of medium mesh sizes produced in market grade diameters. Available in in roll widths of 24", 30", 36" and 48" for use in flour mills.
broadmesh	In broad mesh specifications the warp wire is typically smaller in diameter than the weft wire.
BSI	British Standardisation Institute
bubble point test	The pressure required to pass air bubbles through the mesh (covered by a test liquid) is measured. The average aperture size is then calculated by taking into account surface tension, liquid density, temperature and immersion depth. See- "absolute micron retention" See- "glass bead test"
B.W.G.	Birmingham Wire Gauge.
calendered wire cloth	Wire cloth that has been passed through a set of heavy rollers to reduce the thickness of the cloth or to flatten the wires at weave intersections providing a smooth surface.
Centrisieve	Rotating conical screen typical with a 125 micron screening plate in stainless steel or a finer steel cloth.
clear opening	The space (aperture) between adjacent parallel wires
coarse mesh	Wire cloth having a mesh count of 30 x 30 or less.
count	The number of openings (apertures) in a lineal inch.See- "mesh".
cyclone screener	Cylindrical stationary sieve with rotating paddles flinging the fines through the screen, while the overs leaves the cylinder opposite the inlet.
dewatering	Separation of solids from liquids in which the solids are retained on the screen surface while the liquids pass through the screen (wire mesh or wire cloth) surface.
DIN	German Institute for Standardisation
DTW	Abbreviation for "Dutch Twilled Weave".
Duplex Weave	This specification is similar to a Plain Dutch Weave except that two warp wires are used, rather than one.
Dutch Weave	Wire mesh or filter cloth with warp wires larger than the shute wires. Warp wires remain straight while adjacent shute wires slightly overlap, resulting in a dense, strong material with small irregular, twisting passages that appear triangular in shape when viewing the material diagonally. Dutch weaves have much lower flow rates and much higher particle retention than plain square weaves. See - "Hollander Weave"
filter	A device utilising filter media for particle retention for clarification of a liquid or gaseous fluids.
filter cloth	Wire or synthetic cloth woven with a greater number of wires in one direction than the other, and utilising two different wire diameters. Filter cloth is woven in both plain and twill weave patterns. Also referred to as "Dutch Weave".
filtration	The process of clarifying a fluid or gaseous liquid by the removal (retention) of solid particles
fine mesh	Wire cloth having a mesh count greater than 90 x 90
fines	The product passing the sieve. The overs is retained on the sieve.
flat belt vacuum filter	Horizontal filter with a filter cloth moving discontinuously across a vacuum zone
flooding	The effect created when the screen surface is unable to pass fluids through, in wet screening operations such as washing or dewatering., a result of blinding
Gauge	A term referring to the measure of wire diameter. The Washburn & Moen Gauge is the standard in the manufacture of wire cloth in North America
glass bead test	A suspension containing glass beads is passed through the mesh - the diameter of the largest bead passing through is considered as the absolute micron retention. See - "bubble point test"
Grizzly Screen	Heavy screen cloth usually having a large opening size and made from large diameter high carbon or oil tempered wire or rod.
hard wire	Wire which has been drawn down to a smaller diameter after the annealing process, increasing its unit strength and reducing its elongation.
Hardware Cloth	A square mesh, general purpose galvanised-after plain weave wire cloth.. Made in one wire size only, one for each of several standard meshes. Hardware Cloth is also available in welded construction.
Harp Screen	Screen cloth with long slots, typically 12 inches or longer, for screening high volume tonnage containing a large amount of fines
Hollander Weave	A description applied to woven wire cloth where the diameter of the warp and weft wires, and the mesh count in the warp and weft directions, are different. The wires are driven up much closer during the weaving process, thus producing a more densely compacted weave with small aperture sizes, without reducing the overall cloth thickness. Also referred to as "Dutch Weave".
HP	Hollander Plain Weave.
HT	Hollander Twill Weave.
Hydrocyclone	A liquid-solids separation device utilising centrifugal force for settling.
ICW	Inside clamping width
IWWA	International Wire Weavers Association
inside dimension	(ID) The distance measured between the inner edges of a formed screen panel. Also referred to as "ICW"
ISO	The International Organisation for Standardisation is a worldwide federation of national standards bodies (ISO member bodies). ISO 4782 standard governs metal wire for industrial wire screens and woven wire cloth. ISO 9044 standard governs industrial wire cloth.
KPZ	Reverse Hollander Twill Weave.
long slot	See - "slotted openings"
Market Grade	A group of industrial wire cloth specifications suitable for general purpose screening applications, made of high strength square mesh cloth, available in several types of material. The wire diameters are moderately larger than "mill grade" , with a lower percentage of open area.
medium mesh	Wire cloth having a mesh count of 30 x 30 to 90 x 90 inclusive
mesh no.	This generally denotes the number of apertures in a length of 25.4mm (1"). While it is considered an obsolete designation, it is used extensively.
mesh	Mesh designates the number of openings and fractional parts of an opening, per lineal inch. Mesh is determined by counting the number of openings from the centre of any wire to the centre of a parallel wire, one inch in distance. When the point one inch distant from the centre of a wire falls between wires within an opening, the mesh count is expressed as a fraction.
micron	One micron is equivalent to 0.001mm or 0.00003937 inches. The micron is the unit of measure in the metric system. It is frequently used when referring to the aperture size or particle-retention of filter cloth.
micron retention	Micron retention is defined as the diameter of the largest round particles which can pass through a filter.
Micronic grades	Finer mesh range of Dutch Weave cloth in meshes giving retention of 50 microns or finer.
Mill Grade	Group of industrial wire cloth specifications with lighter wire diameters than "market grade". Standard wire diameters of this grade produce a medium percentage of open area.
Mud Screen	A wire cloth screen panel fitted with hooks for tensioning installed on shale shakers.
non-ferrous alloys	Non-pure metals containing no iron, such as copper, brass, aluminium, etc
OCW	Outside clamping width
off count	A mesh which has a greater number of wires per inch in one direction, usually the warp direction.
open area	The ratio of open space area between the wires, to the total area of a given section of wire cloth, expressed as a percentage. Open area % = (1-ND)² 100, where N = Wires per inch or mesh and D = Wire diameter
opening	The dimension between adjacent parallel wires, usually expressed in decimal parts of an inch. Opening size = (1-(N*D))/N where N = Wires per inch or mesh and D = Wire diameter See - "aperture" See - "space"
outside clamping width	Outside dimension (overall) of hooked edges on a screen panel. Also referred to as "OCW".Most original equipment manufacturers recommend an OCW of 1" less than the clear clamping width between the vibrator side plates.
outside dimension	The distance between the outside edges of a formed screen panel
overs	The product retained on the sieve. The fines is passing the sieve.
particle retention	The particle size that will be retained by a given mesh, usually expressed in microns.
pitch	The distance between centres of two adjacent wires in millimetres.
pitting corrosion	Localised corrosion resulting in small pits or craters in a metal surface.
Plain Weave	Woven wire cloth in which each warp and each weft wire passes over one and under the next adjacent wire in both directions.
Plain Dutch Weave	Dutch weave with each warp and shoot wire passing alternately over and under each successive wire.
plate, screening	Screening plate is a thin stainless steel with etched perforation - preferably made as a profile screen with conical perforations.
plugging	Near size particles trapped in screen apertures (openings) preventing passage of under size particles. See - "blinding"
porosity	The fractional void volume of the mesh.
profile wire	Wire that has been drawn into a "wedge" (tapered) shape, which becomes progressively narrower from top to bottom.
Profile Screen	A screen panel made up of profile wires with openings that become progressively wider from top to bottom. This increases dewatering efficiency and aids in screening material which might otherwise blind a screen surface. Also referred to as "wedge wire screen".
PZ	Reverse Hollander Plain Weave.
rectangular mesh	Wire cloth having a different number of wires in the warp and shoot (shute) usually less in the shoot, producing rectangular openings. See - "off count".
retention	The ability of wire cloth (wire mesh), as a filter medium, to prevent the passage of solids. It is expressed by the diameter, usually in microns, of the largest spherical solid particle that will normally pass through the screening surface.
RPD	Abbreviation for "Reverse Plain Dutch Weave".
Reverse Plain Dutch Weave	The arrangement of the warp and shute wire is reversed as compared to Plain Dutch Weave, providing a higher mesh count in the warp direction rather than the weft (shute) direction.
Rotary Screen	See - "trommel screen".
Rotary vacuum filter	Trommel with filter cloth and support rotating in a tray with product product. The product built up a pre-coat and the filtered product is cut off the rotating drum by a knife and the water is drawn to the interior of the filter drum by a vacuum.
RotoSieve	Rotary screen
sieve	Metric openings, in a fixed ratio, assigned by the U.S. Bureau of Standards, based upon the number 18 sieve having an opening on one millimetre (0.039370"). The relation of consecutive numbered sieves is as one to the fourth root of two (or for every fourth sieve ratio is as one to two). Sieve numbers are arbitrary numbers and have no direct relationship to the number of meshes per inch.
slotted openings	Wire cloth (wire mesh) with rectangular openings which allows the maximum open area and tends to prevent blinding or plugging of material. The warp mesh-count and wire size are indicated before the shoot (weft) mesh- count and wire size.
space	The actual clear opening or space between the inside edges of two parallel wires.
Space Cloth	Square mesh wire cloth which is designated by the width of the open space between the inside edges of two parallel wires.
SPW	Abbreviation for "Single Plain Dutch Weave".
square mesh	Wire cloth with the mesh count and wire diameter the same in both directions.
stranded weave	A twilled weave with multiple wires in both warp and the weft.
strainer	A fabricated assembly of woven wire cloth (wire mesh) designed for the removal of foreign particles from a stream of liquid or gas.
strainer cloth	A plain weave off-count mesh cloth with a high percentage of open area.
support screen	A heavy wire mesh utilised to support a finer mesh in filtration or straining.
S.W.G	British Imperial Standard Wire Gauge.
Testing Sieve	Fabricated circular frames available in stainless steel, brass or plastic fitted with wire mesh woven of brass, phosphor-bronze or stainless steel, having extremely accurate openings. Sieves are produced according to various standards, in the U.S. typically per ASTM E-11-70 in Europe according to DIN
Tinned Cloth	Wire cloth (wire mesh) woven of wire that has been coated with tin before the weaving process. Tinned cloth is generally available in "mill grade" wire diameters.
TRD	Abbreviation for "Twilled Reverse Dutch Weave"
Trommel Screen	A screen panel which is rolled to cover a cylinder, typically fastened by bolts, clamps or straps
Tyler	The W.S.Tyler Company, Cleveland Ohio.The Tyler company is the North American leader for Analytical Sieves of all sizes.Tyler had already standardized their sieves before ASTM, so in some cases, the Tyler number might be different than the ASTM number.
Twill Weave	Woven wire cloth in which each weft wire passes successively over two and under two warp wires and each warp wire passes successively over and under two weft wires.
Twill Dutch Weave	Each warp wire and each weft wire passes over and under the next to adjacent complementary wires, as in a normal "twill weave", except the warp wires are larger in diameter than the weft wires. This allows a greater mesh count in the weft direction. This weave pattern enables the weft wires to be woven more densely, and much smaller aperture sizes can be achieved.
warp	The wires running lengthways during weaving are referred to as WARP wires.
weft	The wires that run across the width of the cloth are referred to as WEFT or shoot wires.
wire	A solid wrought product that is long in relation to its cross section, which is square or rectangular with sharp or rounded corners or edges, or is round, a regular hexagon or a regular octagon, and whose diameter or greatest perpendicular distance between parallel faces (except for flattened wire) is less than 0.375 inch
wire cloth	A general term for material woven from metallic wires.
wire diameter	The diameter of wire before weaving.

Keywords: comparison conversion wire screen sieve cloth DIN ASTM