Virtual Polymer Compounds - VPC Fiberglass fiberglass, frp, fiberglass reinforced plastic, fiber-reinforced plastic, flumes, manholes, shelters, ladders, staff gauges, troughs, baffles, weirs, platforms, on-site repair, tank repair, fiberglass, parshall flume, palmer bowlus flume, h flume, manhole covers, parking booths, ticket booths, vpc fiberglass, virtual polymer compounds Virtual Polymer Compounds (VPC) is a fiberglass product manufacturer that specializes in flumes, metering manholes, manhole covers, shelters, booths, staff guages, and custom fiberglass products.