Glass Merkle International, Inc. is a worldwide leader in energy-efficient suspended refractory systems and related furnace equipment for the glass industry. Merkle is the worldwide leader in suspended feeder wall construction. Merkle supplies refractory designs for float glass and container glass facilities. In addition to supplying our innovative and highly functional products, we purchase and inspect material, and provide technical support during installation.. Merkle International, Inc. offers the following core products for the glass industry: Strut-Air® - Suspended Refractory Wall, used for feeder walls, waist walls or shadow walls. Merkle Batch Charger - A flexible design for consistent charging over a long campaign. MODU-LOK® - An interlocking suspended refractory system for waist covers, canal covers, and suspended curtain walls. Merkle Tin Bath Roof - A unique design, that minimizes defects and allows for operational flexibility in float glass processing. Bay "0" Seal - the start to an efficient, effective tin bath.