This is an aluminum composite sheet, whose thickness ranges from 3mm to 8mm. Most of the used sheet is of 3mm. Price depends on coil strength, quality, color and texture. From our personal experience, the best sheet from Dehradun is Alex Sheet of Kwality Hardware. Below are the catalogue of ALEX ACP Panels.
ACP Sheet is made by sandwiching Low-density polyethylene (LDPE) with a lot of heat and pressure between two Aluminum Coils. This sheet is a waterproof product which is the cheapest exterior material.