A mass spectrometer includes a vacuum manifold having an interior space, a vacuum pump configured to maintain the interior space at a pressure below 5×10-5 torr, a heated component, such as an ion source, located within the interior space, and a multilayer insulator located within the interior space. The multilayer insulator including an inner layer with a first surface oriented towards the heated component and a second surface oriented away from the heated component; and an outer layer with a third surface oriented towards away from the heated component and a fourth surface oriented towards the heated component.