Vacuum forming is used for molding thin sheets of thermoplastic material, typically seen most often in packaging applications.
Frequently Asked Questions
What is a thermoformer?
Sheets of thermoplastic are heated and pulled over a pattern using a vacuum.
What materials can I thermoform?
ABS (Acrylonitrile butadiene styrene) up to 1/4″, GTT* 260 – 280 °F
PETG (Polyethylene terephthalate glycol) up to 1/4″ – GTT 260 – 270 °F
HIPS (High Impact Polystyrene Sheet) up to 1/4″ – GTT 260 – 270 °F
Sheets should be cut to 21×21″ for full size, 14×14″ for 11″ window or 8×8″ for 5″ window.
Look for “Easy-to-Form” sheets on McMaster All “Easy To Form”, ABS, PETG, HIPS
*GTT stands for Glass transition temperature, use an IR thermometer to measure the temperature before forming
How do I make a pattern?
Patterns can be made from a variety of materials. Commonly used materials for patterns include 3D printed parts, machined HDPE or Aluminum, and wood. Note, we do not work with wood in EPIC. PETG is a good option for a 3D printable material as PLA will soften and deform as it is used. Patterns must have a draft angle appropriate for the depth of the part and no undercuts. Air holes designed into the pattern can aid the vacuum to pull down around features. Patterns attached to a backing plate large enough to be held down by the forming window will ease in release of thermoformed part from the pattern while the plastic is still hot (with the vacuum up button).
What is the maximum build volume?
Max 19 x 17″ forming area
For smaller parts there are 2 reducing window options:
11×11″ – Requires 14×14″ sheet
5×5″ – Requires 8×8″ sheet
Max draw 11.5″
What are the limitations of Thermoforming?
No overhangs
Max depth of draw ~11.4″
No sharp corners
What tolerance should I use?
N/A. Not very accurate
How can I learn more?
Download the manufacturers operation manual here Manual-508DT/FS
