(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.
