Gasket mica
SPM: S – mica; P – gasket; M – muscovite;
Gasket mica parts are rectangular and round.
SPM is extensively used while manufacture of electronic devices, and is also used for electrical insulation and attachment of internal fittings for electronic devices. The main raw material for the parts manufacture is muscovite mica. The parts manufacture is carried out by pressing.
Field of application: for application in electrical machines, apparatus, heating appliances or any other devices as insulating gaskets; and also as the frames and bottoms for heating components, gaskets and partitions (in particular, in the manufacture of microwave ovens, etc.)
| Dimensions, mm | Thickness, mm |
| Not above 120 on the larger side | 0,35 +0,30 -0,25 |
Nominal dimensions (length and thickness) of the plates are determined when ordering by agreement with a customer.
Technical specifications SPM TU 5724-025-00281944-01
| Indicator name | Normal range for SPM gasket mica |
| Permitted deviations from nominal dimensions of the length and width, mm, not above | ± 1 |
| Thickness difference due to the partial removal, mm, not above | 0,02 |
| Character of the surface | Smooth, slightly-undulating and undulating |
| Overriding of edge cracks (counting by perpendicular to the edge), not above, as thick as: | |
| Up to 0,35 mm (inclusive) | 3 |
| Over 0,35 mm | 5 |
| Overriding of jagged edges (wire edges and flay marks), mm, not above | 0,5 |
| The length of angle tilt, (by the shortest distance between the break points, lying on the adjacent sides) mm, not above | 2 |
| Punctures, pressing, piercing mineral spots | Not permitted |
| Testing voltage during 1 minute for the plates 0,10-0,15 mm thick, the length from the smallest side is 17 mm and more | 2000 |
Packing: The plates are stacked up into the packs with a height of not above 150 mm and wrapped in cellulose film according to GOST 7730 or paper according to GOST 8273