(1) Map Product Sensitivity
· Snacks (oil-rich): sensitive to oxygen → focus on OTR
· Dairy/chilled foods: sensitive to both O₂ and moisture → balance OTR & WVTR
(2) Tier Your Targets
As a starting framework (23 °C, 0% RH OTR; 38 °C/90% RH WVTR proxies; convert to your standard):
· Standard: OTR 50–150 cc/m²·day, WVTR 3–8 g/m²·day
· Enhanced: OTR 5–50, WVTR 1–3
· Ultra: OTR <5, WVTR <1
(3) Material Choices
· mPET (metallized PET): strong OTR drop, moderate WVTR improvement
· AL-laminated: near-zero OTR, excellent WVTR; lowest transparency
· Coated PET: tunable barrier; keep printability
Combine with seal-layer choices to hit both barrier and peelability.
(4) Thermoforming Tips
· Uniform sheet thickness after forming (avoid web thinning at corners)
· Keep dry handling before sealing; control anti-fog if chilled
· Validate barrier post-form—not just on flat film
(5) Documentation & Claims
Maintain barrier test methods and conditions alongside numbers; align with retailers’ specs.
Related Materials and RFQ Information
Review our PET/EVOH/PE high-barrier thermoforming sheet and the PET/PE, PS/PE and PP/PE laminated sheet selection guide.
Barrier targets should be confirmed using agreed OTR/WVTR test conditions and verified after thermoforming and sealing. For an initial material review, send the food type, target shelf life, storage conditions, sheet thickness, tray depth and sealing method through Contact WANSYN.
