A high-temperature pressure sensor includes a pressure sensor device and a heater shell body external to the pressure sensor device for providing heat to the pressure sensor device. A particle-generating insulation material is encapsulated within an encapsulation material to form an encapsulated insulation structure comprising the particle-generating insulation material within the encapsulation material, such that the encapsulation material substantially contains particles generated by the particle-generating insulation material within encapsulated insulation structure. The encapsulated insulation structure is disposed adjacent to an exterior of the heater shell body.