Quick Comparison Table
| Parameter | PET Sheet | PETG Sheet |
|---|---|---|
| Material | Standard polyester | Glycol‑modified PET copolyester |
| Cold bending | Easy stress whitening | No whitening, tough |
| Thermoforming | Narrow temperature window | Wide window, good for deep draw |
| Drying | High temp drying required | Gentle drying needed |
| Stiffness | Higher rigidity | Softer |
| Cost | Lower | Higher |
| Typical uses | Blister food packaging, printing | Signage, display, complex thermoformed parts |
Pros & Cons Breakdown
✅ PET Sheets
Advantages
- Budget‑friendly for large‑volume orders
- High rigidity and stable dimension after forming
- Good chemical resistance against most oils and food ingredients
- Mature extrusion process, widely available virgin & recycled raw materials
Disadvantages
- Prone to stress whitening when folded or punched
- Easy to crystallize if temperature is out of range during thermoforming
- Strict high‑temperature drying is mandatory to avoid bubble defects
✅ PETG Sheets
Advantages
- Outstanding toughness: hardly cracks during cutting, drilling and cold bending
- Excellent optical clarity, glass‑like transparent effect
- Wider thermoforming window, less risk of product waste
- Low‑temperature drying requirement, simpler production setup
Disadvantages
- Higher material cost than standard PET
- Lower heat‑resistance; will deform under sustained high temperature
- Poor resistance to some strong solvents
How to Choose Between Them
👉 Pick PET sheet if:
- You run mass‑production blister food packaging
- Cost control is your top priority
- Products do not suffer heavy bending or impact after forming
👉 Pick PETG sheet if:
- You need complex deep‑draw thermoformed parts
- Cold bending, punching or mechanical cutting is required
- End‑products require anti‑crack performance for display, protective covers
Final Tip
Most production defects come from wrong drying and temperature settings. Match material performance with your downstream processing instead of blindly chasing higher‑grade raw material.
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FAQ
Q: Can PETG replace PET in all packaging jobs?
A: Not really. PETG brings better toughness, yet higher material cost. For simple food trays and regular blister packaging, PET still delivers better total cost performance.
Q: Do both PET and PETG sheets support food‑contact grade?
A: Yes. Food‑compliant grades are available for both materials for food‑container production.
Q: Can I use the same extruder to produce PET and PETG sheets?
A: The same production line works, but you need to adjust drying temperature, barrel temperature profile and vacuum parameters for material switch‑over.