Flexible Fabricated Products
Mica Packing
Code prefix MPK
Mica packing uses phlogopite as the main raw material, braided with various high-temperature resistant materials to form a sealing packing. It suits temperature fluctuation conditions, with a short-term tolerance temperature of 1000 C and a conventional use range of -200 C to 850 C. The packing provides thermal insulation, thermal stability, low thermal conductivity, low heat storage and sound absorption.
- Continuous
- 850°C
- 1562 °F
- Short peak
- 1000°C
- 1832 °F
- Construction
- Unreinforced
- MPK
Spec sheets are issued against the confirmed grade, with the test method named on the report.
01 — Product description
Phlogopite for temperature cycling
Mica packing uses phlogopite as the main raw material, braided with various high-temperature resistant materials to form a sealing packing. It is suitable for temperature fluctuation conditions, with a short-term tolerance temperature of 1000 C and a conventional use range of -200 C to 850 C. The packing provides thermal insulation, thermal stability, low thermal conductivity, low heat storage and sound absorption.
| Test item | Parameter |
|---|---|
| Tensile strength | ≥ 820 MPa |
| Elongation | ≥ 30 % |
| Short-term tolerance temperature | 1000 C |
| Minimum use temperature | -200 C |
Scope of application
Suitable for high-temperature valve stem sealing and annular sealing under temperature fluctuation conditions, with a conventional applicable range of -200 C to 850 C.
Working condition suitability and restrictions
850 C is the conventional continuous temperature and 1000 C only the short-term tolerance; long-term over-temperature operation is not allowed. The packing suits dry, high-low temperature alternating static and low-speed sealing. It is not suitable for high-speed medium erosion, high-frequency severe friction, strong impact loads or long-term immersion, which cause wear, structural failure and sealing leakage.
Usage precautions
- Match working temperature, pressure and medium parameters before installation; long-term use beyond the limits is prohibited.
- Suitable for media with a large acid-base span; extremely corrosive conditions need prior suitability testing.
- Inspect the seal regularly and replace on wear, hardening, cracking or leakage.
- All technical data are for reference; users should test suitability and follow relevant safety regulations.
02 — Characteristics
Temperature fluctuation
Developed for alternating high and low temperature duty, with a 1000 C short-term tolerance.
Wide working range
Conventional use from -200 C to 850 C.
Mechanical values
Tensile strength ≥ 820 MPa and elongation ≥ 30 % in the declared test.
Insulation and damping
Low conductivity, low heat storage and sound absorption in one braided section.
03 — Typical properties
Values typical, confirm against duty
| Test item | Value | Note |
|---|---|---|
| Raw material | Braided packing | |
| Tensile strength | Test value | |
| Elongation | Test value | |
| Continuous range | Conventional | |
| Short-term | Not a continuous rating |
04 — Standard sizes
| Product code | Dimensions |
|---|---|
| MPK-SQ | Square section, to gland size |
| MPK-RD | Round section, to gland size |
| MPK-CUSTOM | Section and length to order |
05 — Where it is used
- High-temperature valve stem sealing
- Annular sealing under temperature fluctuation
- Static and low-speed sealing duty
- Equipment with alternating temperatures
Service limits
- 850 C is the conventional continuous temperature and 1000 C only the short-term tolerance; long-term over-temperature operation is not allowed.
- For dry, high-low temperature alternating static and low-speed sealing: not for high-speed media erosion, high-frequency severe friction, strong impact loads or long-term immersion.
- Match temperature, pressure and medium parameters before installation; strongly corrosive media need prior suitability testing.
- Inspect the seal at intervals and replace on wear, hardening, cracking or leakage.
Related materials
View family
Mica Packing
MPK