For Tea & Light Food Brands
Many tea and light food brands have encountered the same pitfall when switching to compostable packaging. They adopted standard PLA packaging for all products, which works well for cold drinks. However, when filled with hot food, the packaging softens, deforms and even leaks, resulting in numerous customer complaints.
Both are fully biodegradable materials. Why is PLA widely used for cold cup lids, while CPLA is mandatory for hot food containers and high-temperature takeaway packaging? Packaging selection is not simply about choosing the most expensive material. The key considerations include operating temperature, food type, storage & transportation conditions, and compliance requirements.
This guide clarifies the differences between PLA and CPLA, and provides procurement teams with a practical, ready-to-use material selection standard.
1. Basic Introduction: What are PLA and CPLA?
PLA (Polylactic Acid)
PLA is produced by fermenting biomass raw materials such as corn and cassava. It is the mainstream fully biodegradable material on the market and can obtain international compostability certifications including EN13432 and BPI, supporting brands’ plastic reduction and ESG goals.
✅ Advantages: High transparency, excellent moldability, suitable for mass production and cost-effective.
⚠️ Limitations: Low heat resistance. Standard PLA has a heat deflection temperature of only 50~60°C. It softens and deforms easily upon contact with hot food, so it cannot be used for hot takeaway meals.
CPLA (Crystallized Polylactic Acid)
CPLA is modified PLA made from PLA base material via crystallization treatment. It retains full biodegradability and compostable properties.
✅ Advantages: Greatly improved heat resistance, with heat deflection temperature ranging from 85~100°C. It can directly hold hot rice, pasta, soup and hot beverages. It maintains rigidity under high temperatures and resists collapse and leakage during delivery.
⚠️Limitations: Higher production cost than standard PLA, reduced transparency with a semi-matte finish, and stricter processing requirements.
2. Application Scenarios: Material Selection for Tea & Light Food
✅ PLA for Low-temperature Applications
Working temperature: ≤55°C
Suitable products**: iced milk tea, cold brew coffee, fruit iced tea, cold salad, cold platters, refrigerated ready meals, cold drink cup lids and cold food boxes.
Benefits: High clarity to showcase food and drink appearance, matching the aesthetic requirements of beverage brands. Economical for large-scale rollout across store networks.
**Restrictions**: Not for boiling hot food, soup or hot drinks. Long-term exposure to direct sunlight in warehouses during summer may cause deformation.
✅ CPLA for High-temperature Applications
Working temperature: 80~95°C
Suitable products: hot light meals, fried rice, pasta, hot soup, freshly brewed hot coffee, hot takeaway containers and lids.
Benefit: Heat resistant, anti-deformation and leak-proof. It remains stable even sealed inside insulated takeaway bags during long delivery trips, preventing customer complaints caused by packaging failure.
Restrictions: Semi-matte appearance with lower transparency than PLA and higher procurement cost.
3. Core Procurement Checklist
For internal evaluation, sample testing and supplier inquiries
1. Actual filling temperature (Priority #1)
Do not rely solely on menu temperature labels. Base your assessment on the measured temperature at dispensing plus accumulated heat during takeaway delivery:
Measured temperature ≤60°C: Iced drinks, cold salads, chilled ready meals → Prefer PLA for appearance and cost control.
Measured temperature >65°C: Hot rice, noodles, soup, freshly prepared hot drinks → CPLA is required.>
Important reminder: Insulated takeaway bags trap heat. The actual temperature contacting packaging is often higher than the temperature at store dispensing. Never use standard PLA for hot takeaway.
2. Storage, logistics and ambient risk assessment
For southern China, and export markets such as Mexico and Southeast Asia with tropical climates, high temperature and humidity risks must be assessed:
- Long sea freight in shipping containers and warehouse sunlight exposure in summer can lead to creep deformation of PLA packaging, even for cold food products.
- High humidity shortens the shelf life of PLA products. Confirm moisture-proof packaging solutions with suppliers.
- CPLA delivers superior high-temperature stability, recommended for hot food packaging in tropical regions.
3. Compliance, certification and labeling review (Domestic & Export)**
Both PLA and CPLA can obtain BPI, OK Compost and EN13432 certifications. Procurement teams must verify three key points:
The raw material formulation listed on certificates must match the supplied products. Any formula change invalidates existing certifications.
Labeling rules: CPLA is modified PLA and shall not be marked as other materials. For overseas exports, strictly distinguish between the terms “compostable” and “biodegradable” to avoid compliance risks.
Complete supporting documents: food contact material test reports, MSDS, and certificates of origin for foreign trade orders.
4. Cost planning – Avoid one-size-fits-all purchasing
Full brand packaging replacement does not require switching all packaging to CPLA. Adopt a mixed material strategy to balance ESG targets, user experience and cost:
- Cold drink & cold food lines: Use PLA to control mass packaging costs.
- Hot meal, hot soup and high-temperature takeaway lines: Use CPLA to eliminate deformation and leakage complaints.
- New product launch: Run small batch trials and collect in-store feedback before placing bulk orders to reduce trial risks.
4. Common Misconceptions Clarified
Misconception 1: CPLA is a new material and not fully biodegradable
Correction: CPLA is crystallized modified PLA derived from corn and cassava biomass. It is fully biodegradable. Qualified CPLA meets EN13432 and BPI industrial compost standards.
⚠️ Warning: Some low-cost imitation CPLA products add large amounts of fossil-based fillers to boost heat resistance but lose full biodegradability. Verify complete formulation against certification documents.
Misconception 2: PLA / CPLA degrade naturally in soil or household bins
Correction: This is a major greenwashing risk for brands. PLA and CPLA only degrade in industrial composting facilities, under sustained conditions of above 58°C, high humidity and specific microbial communities. Degradation is extremely slow in ordinary soil, home compost bins or marine environments. No degradation occurs under room temperature storage or refrigeration.
If local industrial compost infrastructure is unavailable, certified compostable packaging will not break down rapidly. All marketing statements must be accurate.
Misconception 3: CPLA outperforms PLA in all scenarios
Correction: CPLA’s advantages are limited to rigidity and deformation resistance under high temperatures. At room temperature and equal thickness, PLA has better stiffness and transparency. Crystallization makes CPLA relatively brittle, and its bending resistance may be inferior to PLA in low-temperature conditions. Material selection must include drop and bending tests based on real usage scenarios instead of simple material comparison.
Misconception 4: PLA from different suppliers performs identically
Correction: PLA is available in multiple grades. Formulation and sheet production processes vary widely among manufacturers, resulting in big differences in heat resistance, oil resistance and brittleness. BPI and OK Compost certifications are tied to specific formulations. When switching suppliers, old test reports and certifications cannot be reused; re-verification of formulation and certificates is mandatory.
Misconception 5: CPLA can withstand boiling water indefinitely because it resists up to 100°C
Correction: The rated 85~100°C heat resistance of CPLA refers to short-term contact temperature. It cannot withstand prolonged immersion in boiling water or sustained sealed high heat. For long-distance hot soup delivery, pair CPLA packaging with optimized lid locking structure to prevent oil leakage and deformation.
5. Summary
Selecting fully compostable packaging is about matching materials to scenarios rather than comparing material performance.
For cold drinks and cold food requiring high clarity and cost efficiency, PLA is the optimal choice. For hot meals and high-temperature takeaway requiring heat resistance and leak protection, CPLA is necessary.
A well-designed mixed material solution helps brands achieve plastic reduction ESG goals, reduce customer complaints and optimize overall packaging costs.