PVDC/PVOH/EVOH Coatings: Applications & Cost Differences in Flexible Packaging
PVDC, PVOH and EVOH are three mainstream high-barrier coating materials widely used in flexible packaging. They effectively block oxygen, moisture, oil and retain fragrance for food, pharmaceutical and daily chemical products. Distinct gaps exist in performance and cost, catering to diverse application demands and budget ranges.
Core Properties & Application Scenarios
1. PVDC Coating
Boasts excellent dual barrier against oxygen and water vapor, outstanding oil and chemical resistance, stable performance under high humidity and suitability for high-temperature retort processing. It features good heat sealability.
Common applications: meat products, pickled food, dairy goods, pharmaceutical blister packs, toothpaste, cosmetics, tea and tobacco packaging. It can be coated on BOPP, PET, PA and CPP substrates.
2. PVOH Coating
Delivers superior oxygen barrier in dry conditions with high transparency and fragrance retention. It is eco-friendly and cost-effective, yet its barrier performance declines sharply in humid environments.
Common applications: nuts, biscuits, puffed snacks, instant food seasonings and other dry food packaging, ideal for cost-sensitive medium and low-barrier packages.
3. EVOH Coating
Possesses top-tier oxygen barrier property, paired with great transparency, oil resistance and processability, and recyclability. Its barrier capacity drops drastically under high humidity, requiring multi-layer co-extrusion structure for moisture protection, with the highest material cost among the three.
Common applications: premium food such as fruit juice, seafood and delicatessen, pharmaceutical sterile packaging, health supplements, pesticides and high-end cosmetic packages.
Cost Comparison
Cost ranking from low to high: PVOH ＜ PVDC ＜ EVOH
- PVOH enjoys the lowest cost, around 10% cheaper than PVDC.
- PVDC offers favorable cost performance, priced at 40%-50% of EVOH. Domestic production is mature and sufficient.
- EVOH relies heavily on imported raw materials, costing 2 to 2.5 times that of PVDC, reserved for high-end high-barrier usage.
Humidity resistance, coating process and domestic production rate also bring extra cost variations to practical production.
Material Selection Guide
- PVDC: Preferred for high-humidity scenarios with balanced barrier performance and cost control.
- PVOH: Optimal choice for dry goods pursuing cost-efficient oxygen barrier effect.
- EVOH: Applied to high-end products requiring ultra-high barrier performance in dry environment.
Summary
The three coating materials form a complete high-barrier solution system for flexible packaging. PVDC achieves balanced performance and cost with wide applicability; PVOH serves economical dry packaging demands; EVOH takes the lead in premium ultra-barrier packaging. Proper material selection based on product humidity condition, shelf life requirement and budget maximizes comprehensive benefits.
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