Thermoforming is a process of heating thermoplastic sheet and placing it over a mold, under vacuum, until cooled. The thickness of the material determines whether the manufacturing process uses rolled sheets (thin gauge) or pre-cut stacked sheets (heavy gauge). Thin gauge material is dominant in the disposable packaging sector, especially in the retail markets. Heavy or thick gauge material is commonly used as permanent components in such things as refrigerators, automobiles and spas to name a few.
Materials PVC, PETG, and PET are the most commonly used materials.