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MPP™
"Micro-Perforated Plate"
- The Low Cost Alternative to Expensive
Photo-Etched Media
- Uniform square holes in a square perforation pattern
- Smooth surface finish with no sharp edges or burrs
- Wide variety of holes down to .001" aperture (25 microns)
The Perfect Alternative to
Expensive Photo-Etched Media
MPP™ or "Micro-Perf" is a useful
part of the Dynapore® family of microporous stainless steel
materials. This series of materials is produced by super-calendering and
diffusion-bonding woven wire meshes. Calendaring and sintering imparts
strength, a smooth surface finish, and permanent unchangeable pore size.
The result is a transformation of foraminate (woven) media into sheets
resembling perforate materials. However, MPP™ offers a range of hole sizes
unachievable by conventional perforation, at a cost substantially lower
than photo-etched media. The section photomicrograph above indicates a
flow path perpendicular to the planar surface with "nozzle-like"
entrace and exit.
- Wire Mesh
 
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Wire Mesh can achieve the required basic pore
size & density "as woven," but is subject to fraying
wires and aperture enlargement under pressure. It lacks strength,
a smooth surface and a permanent, unchangeable pore size. The section
photomicrograph indicates a non-perpendicular flow path.
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- Photo-Etched Media
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Photo-Etched Media offers strength, uniform pore
size & a smooth finish. However, it may be a very costly solution.
Moreover, photo-etched media may not be available in the same sheet
sizes, aperture sizes & densities, and alloys as Micro-Perforated
Plate. Note the reduced hole cross-section depicted in the
photomicrograph.
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The table below gives the geometric characteristics of various grades
of MPP™. Remember that the thinner MPP™ materials can be diffusion-bonded
to other substrates such as coarser MPP™, wire mesh or perforated plates
for enhanced mechanical strength. MPP is available in flat sheets in 304L
and 316L stainless steels. Other materials are available on special order.
MPP Micro-Perforated Plate Specification
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| Part No. |
Holes
Per Inch |
Hole
Size (in.) |
Land
(in.) |
Thickness
(in.) |
Open
Area (%) |
Weight
(lb/ft²) |
| 406011 |
10 |
0.0750 |
0.0250 |
0.0197 |
56.3% |
0.412 |
| 406017 |
16 |
0.0445 |
0.0180 |
0.0141 |
50.7% |
.345 |
| 406021 |
20 |
0.0410 |
0.0090 |
0.0071 |
67.2% |
.105 |
| 406025 |
20 |
0.0340 |
0.0160 |
0.0126 |
46.2% |
.344 |
| 406031 |
30 |
0.0268 |
0.0065 |
0.0051 |
64.8% |
.084 |
| 406035 |
30 |
0.0213 |
0.0120 |
0.0094 |
40.8% |
.294 |
| 406039 |
30 |
0.0183 |
0.0150 |
0.0132 |
30.1% |
.474 |
| 406041 |
40 |
0.0185 |
0.0065 |
0.0051 |
54.8% |
.113 |
| 406045 |
40 |
0.0150 |
0.0100 |
0.0079 |
36.0% |
.276 |
| 406049 |
40 |
0.0115 |
0.0135 |
0.0130 |
21.2% |
.530 |
| 406051 |
50 |
0.0145 |
0.0055 |
0.0043 |
52.6% |
.101 |
| 406055 |
50 |
0.0110 |
0.0090 |
0.0079 |
30.3% |
.284 |
| 406061 |
60 |
0.0122 |
0.0045 |
0.0035 |
53.3% |
.081 |
| 406065 |
60 |
0.0092 |
0.0075 |
0.0065 |
30.5% |
.237 |
| 406069 |
60 |
0.0057 |
0.0110 |
0.0120 |
11.7% |
.529 |
| 406081 |
80 |
0.0088 |
0.0037 |
0.0029 |
49.6% |
.069 |
| 406085 |
80 |
0.0070 |
0.0055 |
0.0046 |
31.4% |
.169 |
| 406089 |
80 |
0.0055 |
0.0070 |
0.0069 |
19.4% |
.274 |
| 406101 |
100 |
0.0055 |
0.0045 |
0.0039 |
30.3% |
.142 |
| 406121 |
120 |
0.0046 |
0.0037 |
0.0031 |
30.7% |
.116 |
| 406151 |
150 |
0.0041 |
0.0026 |
0.0020 |
37.4% |
.071 |
| 406201 |
200 |
0.0029 |
0.0021 |
0.0016 |
33.6% |
.063 |
| 406251 |
250 |
0.0024 |
0.0016 |
0.0013 |
36.0% |
.046 |
| 406325 |
325 |
0.0017 |
0.0014 |
0.0011 |
30.0% |
.044 |
| 406401 |
400 |
0.0015 |
0.0010 |
0.0009 |
36.0% |
.033 |
| 406501 |
500 |
0.0010 |
0.0010 |
0.0009 |
25.0% |
.029 |
Print this table 
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Availability
MPP™ is available in sheets up to 24"
x 48" in AISI type 304L, 316L and 347 stainless steels in pore sizes
down to 25 microns. Other alloys such as Monel, Nickel, and Ni-Chrome
are available on special order.
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