The resin sealing used allows Murata to utilize an original screening technology for particles in the cavity. Historically, due to the manufacturing challenges of crystal resonators there has always been a processing issue with inorganic particles in the cavity. With conventional high temperature screening, crystal vendors could successfully screen out organic materials which soften and stick to the crystal element, but it was difficult for them to screen out inorganic materials. Murata has developed an original innovative particle screening technology to screen out inorganic materials. Murata calls this screening technology: “Humidity Screening”. The resin adhesive allows far less moisture with no influence to the performance and reliability to pass through the sealing. Murata used this feature to develop this screening to fix inorganic materials to the surface of the crystal elements and screen them out.