Wilton Corporation of the United States developed the world's first pneumatic diaphragm pump. Through fifty years of continuous process improvements and technological innovations, Wilton's products hold a 55% market share globally, making it the largest manufacturer of pneumatic diaphragm pumps and accessories. Wilton pumps currently come in eight specifications (1/4 inch to 4 inch inlet), with a flow rate of up to 275 GPM (1040 L/min), an output pressure of up to 125 Psig (8.6 Bar), and a temperature resistance of up to 176.7°C (350°F). Structural materials include: aluminum alloy, cast iron, 316 stainless steel, corrosion-resistant nickel-based alloy, polypropylene, polyvinylidene fluoride, carbon-filled acetal, and Teflon. They are suitable for industries such as paint, mining, chemical, pulp and paper, wastewater treatment, electroplating and surface treatment, oil and gas, ceramics, semiconductors, food and pharmaceuticals, and marine. Due to the absence of tightly fitted components, particles can pass through the pump without damage. Abrasive and viscous materials can also be pumped easily without compromising the characteristics of the liquid. The pump can run dry and self-prime in many process and waste applications without risk. With no packing or mechanical seals, Wilton pumps are well-suited for handling flammable liquids.