If you are new to vacuum forming, you might assume that both methods are essentially the same. In reality, however, there are significant differences between thick-gauge and thin-gauge processes. The dividing line lies at a material thickness of 3mm.
This article will help you clarify these distinctions and select the right process for your specific project.
For thick-sheet and thin-sheet forming, 3 mm serves as the dividing line.
| Thin sheet thermoforming | heavy gauge thermoforming | |
| Material thickness | ≤3mm | ≥3mm |
| Another name | thin gauge | thick sheet gauge |
| Product | package tray, esd tray, food tray | equipment cover, plastic auto parts, plastic forklift parts |
| Mass production | several thousand to tens of thousands | a few hundreds to a few thousands |
What is Thin-Sheet Thermoforming?
Thin-sheet thermoforming utilizes plastic sheets with a thickness of less than 3 mm. The production process is rapid and typically employs automated machinery fed by roll stock. The material unwinds from a roll and proceeds through a fully automated inline process involving heating, forming, and die-cutting.
Common Products:
ESD Trays
Food Trays
Electronics Trays
Common Materials:
PET, PP, PS, PVC (primarily food-grade or packaging-grade)
What is Heavy-Gauge Thermoforming?
Heavy-gauge thermoforming utilizes sheet materials with a thickness of 3 mm or greater. The production process is somewhat slower than other methods, as it employs individual sheets rather than coiled rolls. Each sheet is loaded-either manually or via robotic arm-then heated, formed, and subsequently trimmed individually.
Common Products:
Medical equipment enclosures
Forklift dashboards and covers
Electric vehicle battery covers
Truck interior components
ATM machine housings
RV underbody components
Common Materials: ABS, PVC, PC, ASA, HDPE, Acrylic
Which option should you choose?
1. What is the wall thickness of your product?
Less than 3mm → Thin-sheet thermoforming
3mm or greater → Heavy-gauge thermoforming
2. How many units do you need to produce?
Tens of thousands or more → Thin-gauge
From hundreds to thousands → Thick-sheet gauge
3. Where will your product be used?
Disposable packaging, food contact applications → Thin-sheet thermoforming
Industrial equipment, automotive, forklifts, EV components → Heavy-gauge thermoforming
Frequently Asked Questions
Q: Can a thick-sheet machine produce thin-sheet products?
A: It can, but it is not cost-effective. Thick-sheet machines operate slowly and simply cannot compete with the efficiency of automatic roll-fed machines when producing thin-sheet products.
Q: Can a thin-sheet machine produce thick-sheet products?
A: No, it cannot. Thin-sheet machines lack sufficient heating capacity; furthermore, the sheet material cannot be physically loaded into the machine, and the applied pressure is inadequate.
Q: Is the 3mm threshold a strict, absolute limit?
A: That serves as a rough guideline. There is little practical difference between 2.8mm and 3.2mm; however, the manufacturing processes required for 2mm and 5mm materials are entirely different.