If you work with vacuum furnaces or high-temperature filtration, you already know what molybdenum wire mesh can do. To be honest, the last three years have made it even more relevant—semiconductor lines are getting hotter, hydrogen processing is trending, and reliability expectations are brutal. As a reporter-turned-buyer, I’ve seen specs creep upward while budgets… don’t. That’s where molybdenum wire mesh (often called “molybdenum mesh”) hits a sweet spot: melting point ≈2623°C, excellent dimensional stability, and a workhorse attitude in vacuum.

 

What’s changing in the industry

Furnace OEMs are shifting from graphite to refractory metal internals for longer life. Vacuum brazing and powder metallurgy are growing fast, while battery and hydrogen components demand cleaner, low-outgassing tooling. Surprisingly, many customers say they’re standardizing on molybdenum wire mesh for fixtures and screens because it holds shape after repeated 1100–1400°C cycles in H₂ or Ar. Caveat: avoid oxidizing atmospheres above ≈600°C—moly isn’t fond of them.

Parameter	Typical value	Notes
Material	Pure Mo ≥99.95%	Moly or Mo alloy on request
Mesh count	4–200 mesh	ISO 9044 / ASTM E2016 compliant
Wire diameter	0.03–1.0 mm	Tighter tolerances available
Weave types	Plain, Twill, Dutch (dense)	Square or rectangular openings
Electrical resistivity	≈5.3 μΩ·cm (20°C)	Real-world use may vary
CTE	≈5.0 ×10⁻⁶/K	Good thermal stability
Melting point	≈2623°C	Refractory metal class

Core specifications (typical)

From wire to woven: process and testing

Process flow (short version): vacuum-melted moly ingot → precision wire drawing → intermediate anneals → cleaned and lubricated → woven (plain/twill/Dutch) → degrease → vacuum anneal for stress relief → dimensional and surface check → packaging. Testing typically follows ASTM B387 for wire chemistry/mechanics, ISO 9044 and ASTM E2016 for mesh count, aperture, and diameter tolerances; optional low-outgassing per ASTM E595 if you’re going into UHV. Service life? In vacuum/H₂ at 1100–1400°C, many shops report 1000–3000 h before sag criteria are hit, but loading and fixture geometry matter a lot.

Where it’s used (and why)

· Vacuum furnace trays, screens, and shielding—stays flat through thermal cycling.

· Powder metallurgy sintering supports—clean, low contamination risk.

· Semiconductor diffusion and sputtering fixtures—stable, low outgassing.

· High-temp filtration in inert/hydrogen atmospheres—durable vs. stainless.

Many customers say molybdenum wire mesh cuts fixture replacement by a third versus 310/330 stainless when run hot in protective atmospheres.

Quick vendor snapshot (real-world buying factors)

Vendor	Purity	Mesh range	Lead time	Certs	Notes
Woven Filter Mesh	≥99.95%	4–200	2–4 weeks	ISO 9001, RoHS	Strong Dutch weave options
Vendor A	≥99.9%	10–150	4–6 weeks	ISO 9001	Lower MOQ, fewer weaves
Vendor B	≥99.95%	6–180	Stock for common sizes	ISO 9001, REACH	Good for rush jobs

Customization

Available customizations: mesh count and wire diameter pairing, sheet/roll sizing, weave (plain/twill/Dutch), edge trimming and framed panels, vacuum anneal level, flatness class, and inspection reports (CoC, 3.1 MTR). Ask for outgassing data if you’re running UHV.

Field results (quick cases)

· Vacuum brazing shop replaced 330SS screens with molybdenum wire mesh; after 9 months, tray sag reduced ≈28% and scrap dropped 12% on thin foils.

· Powder metallurgy line using Dutch-weave molybdenum mesh improved fines retention; cycle time held steady while cleaning intervals doubled.

Testing and certifications

Typical test data: tensile strength (room temp) 620–760 MPa; resistivity ≈5.3 μΩ·cm; dimensional tolerance per ISO 9044/ASTM E2016; chemistry per ASTM B387. Common certifications: ISO 9001, RoHS/REACH statements, material traceability to heat/lot, optional ASTM E595 outgassing reports. In practice, buyers also request flatness maps for large panels—worth it.

Bottom line: if heat, vacuum, and cleanliness are your world, molybdenum wire mesh is the safe, durable pick—just keep it out of oxidizers when it’s red hot.

References

1. ASTM E2016 – Standard Specification for Industrial Woven Wire Cloth

2. ISO 9044 – Industrial wire screens and woven wire cloth

3. ASTM B387 – Molybdenum and Molybdenum-Alloy Bar, Rod and Wire

4. MatWeb: Molybdenum, material properties (typical)

 

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