Ratan Mica Exports Private Limited supplies Gauge Glass Mica Shield Flakes. Ratan Mica Exports Private Limited is an ISO 9001:2000 certified company. Gauge Glass Mica Shield Flakes are used with flat transparent sight glasses in water and liquid level gauges and columns of high pressure steam boilers. Gauge Glass Mica Shield Flakes gives protection, retains basic strength and increases service life of sight glasses when used at extreme steam pressure and high working temperature. It is used as an ideal transparent medium for monitoring the liquid level and pressure of steam.