Gasket material
Mica Gasket Material
Mica gasket sheet is a mica-based sealing material, plain or with a perforated stainless steel insert, for hot gas joints at low pressure: the cited maker names exhaust pipes, turbines, turbochargers and fuel lines. Mica gaskets are not cut on our waterjet; they are supplied cut by the sheet maker or a cutting partner and quoted from your drawing.
- Family
- Mica-based sheet
- Temperature
- To 900 C (1652 F) with a perforated stainless insert
- Thickness
- 1.3 mm to 3.2 mm (reinforced sheet)
- Designations
- Maker grade callouts (Milam™ PSS for the reinforced sheet)
- Product
- Supplied cut to your drawing by the sheet maker or a cutting partner
Figures are the cited maker or standards values; the sheet datasheet and your application govern the final choice.
Every common gasket sheet material is quick for us to source.
What mica seals
The cited sheet is made for exhaust pipes, turbines, turbochargers and fuel lines, and its maker recommends it for exhaust systems [S1]. It is rated to 900 C with a perforated stainless insert, at pressures up to 5 bar, and its maker lists resistance to oxidation among its strengths [S1].
The cited sheet stops at 5 bar, so mica is a low-pressure sheet [S1]. Hot joints under more pressure usually take flexible graphite or compressed fiber sheet, whose pages give their cited limits.
How mica gaskets are supplied
Mica gaskets are not cut on our waterjet. They are supplied cut by the sheet maker or a cutting partner and quoted from the same DXF, DWG or PDF as any gasket here. Send the drawing, the maker's grade if the print names one, plain or reinforced, the thickness and the quantity.
Specifications
Mica specifications
| Property | Value (in / mm, C / F as stated) | Source |
|---|---|---|
| Composition, reinforced | Mica sheet with one perforated stainless steel insert, EN 1.4401 / AISI 316(L), 0.1 mm thick (KLINGER® Milam PSS) | [S1] |
| Temperature, reinforced | To 900 C (1652 F) | [S1] |
| Pressure | 5 bar (72 psi) maximum on the cited sheet | [S1] |
| Thickness, reinforced | 1.3, 1.5 and 3.2 mm | [S1] |
| Designations | Maker grade callouts; no ASTM F104 line callout is cited for mica here | [S1] |
How we cut it
Mica, felt and tanged (metal-inserted) flexible graphite are the sheets on this index that do not go on our waterjet (homogeneous graphite does), so mica gaskets are supplied cut by the sheet maker or a cutting partner rather than cut in our shop. They are quoted from the same drawing. Send a DXF, DWG or PDF with the grade, the thickness and the quantity, and the routing is settled before the quote.
Where Mica is used, and the usual alternatives
The print or the sheet datasheet governs; these are the sheets usually specified instead:
- Flexible graphite: when the joint carries liquid or more than 5 bar.
- Compressed non-asbestos fiber: when the joint runs below the fiber sheet's limit.
- Silicone sponge: when a soft door seal is wanted on a hot enclosure.
- Filled PTFE: when the medium is a chemical rather than a hot gas.
Related gasket materials: Flexible Graphite Gasket Material, Compressed Non-Asbestos Fiber (CNAF) Gasket Material, Silicone Sponge Gasket Material, Filled PTFE Gasket Material, Expanded PTFE (ePTFE) Gasket Material, Cellulose (Vegetable) Fiber Gasket Material. The full index is on the gaskets hub; send the drawing through request a quote.
Frequently asked
How hot can a mica gasket run?
The cited sheet with a perforated stainless insert is rated to 900 C, at up to 5 bar. At that rating pressure is the tighter limit.
Do you waterjet-cut mica?
No. Mica gaskets are supplied cut by the sheet maker or a cutting partner and quoted from your drawing.
Is mica a pressure gasket?
No. The cited sheet is limited to 5 bar; hot joints under more pressure take flexible graphite or a metal gasket.
What should the print say?
The maker's grade if known, plain or reinforced, the thickness and the quantity, with a DXF of the shape.
Sources
- [S1] KLINGER Milam PSS, KLINGER Thermoseal, https://www.klinger-thermoseal.com/products/klinger-milam-mica-gasket-materials/klinger-milam-pss/, accessed 2026-09-28.
KLINGER is a trademark of KLINGER AG; Milam is a trademark of its owner. No affiliation or endorsement is implied.
Related guides
Setting Conquest Seal up as a supplier?
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the Mica gasket drawing and the quantity
Upload a DXF, DWG or PDF of the gasket with the quote request, or a photo of the part with a ruler if no drawing exists. Add the sheet thickness, the durometer or grade, the quantity and whether adhesive backing is wanted. These parts are cut by the sheet maker or a cutting partner and quoted from your drawing; a Conquest representative replies. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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