Compostable Materials Guide
The development of compostable materials has become an important part of the transition toward sustainable packaging.
Traditional plastics are derived from fossil fuels and can persist in the environment for hundreds of years. In contrast, compostable materials are designed to break down into natural elements under controlled composting conditions.
These materials are increasingly used in sustainable packaging products such as compostable bags, food packaging, and biodegradable films.
This materials hub explores the most important biodegradable materials used in compostable packaging and explains how they work.
What Are Compostable Materials?
Compostable materials are biodegradable polymers that can break down into water, carbon dioxide, and biomass in composting environments.
Unlike conventional plastics, compostable materials are designed to return safely to natural ecosystems when processed under appropriate composting conditions.
To ensure environmental safety, many compostable materials must comply with certification standards such as:
• ASTM D6400
• EN 13432
• BPI certification
These standards verify that materials can properly biodegrade and disintegrate during composting.
Bioplastics Materials
Bioplastics are plastics derived from renewable biological sources such as corn, sugarcane, or plant starch.
They are an important category of materials used in compostable packaging.
Common bioplastics include:
• PLA (polylactic acid)
• starch-based polymers
• cellulose-based materials
Bioplastics can help reduce reliance on fossil resources and support more sustainable production systems.
PLA (Polylactic Acid)
PLA is one of the most widely used materials in compostable packaging.
It is produced from plant-based sugars such as corn starch or sugarcane.
PLA offers several advantages:
• renewable raw materials
• good transparency
• compatibility with food packaging
• compostability under industrial composting conditions
PLA is commonly used in compostable bags, food containers, and packaging films.
PBAT (Polybutylene Adipate Terephthalate)
PBAT is a biodegradable polymer that is commonly blended with PLA and starch materials.
While PBAT is partly petroleum-based, it is designed to biodegrade in composting environments.
PBAT provides important performance characteristics:
• flexibility
• tear resistance
• improved film strength
For a detailed comparison, see PBAT vs PLA.
Starch-Based Materials
Starch-based polymers are another important component of compostable materials.
Starch derived from crops such as corn or cassava can be blended with biodegradable polymers to create flexible compostable films.
These materials are commonly used in:
• compostable garbage bags
• food waste liners
• agricultural films
Starch helps improve biodegradability while reducing the amount of synthetic polymers required.
How Compostable Materials Are Used
Compostable materials are used across a wide range of packaging products.
Common applications include:
• compostable garbage bags
• compostable shopping bags
• food waste collection liners
• biodegradable packaging films
To understand how these materials are transformed into finished products, see compostable bag production process.
Why Compostable Materials Matter
The adoption of compostable materials helps address several environmental challenges associated with traditional plastics.
Benefits include:
• reduced plastic pollution
• renewable material sources
• compatibility with composting systems
• support for circular waste management
However, compostable materials must be properly certified and processed in suitable composting facilities to achieve their environmental benefits.
Explore More Materials Resources
Our materials section includes additional guides that explore biodegradable polymers and compostable plastic technologies.
Recommended resources:
These resources provide deeper insights into the materials used in sustainable packaging systems.
Conclusion
Compostable materials such as PLA, PBAT, and starch-based polymers are playing an increasingly important role in the development of sustainable packaging solutions.
By replacing traditional petroleum-based plastics with biodegradable materials, businesses can reduce environmental impact and support more responsible packaging systems.
Understanding these materials is an important step toward building a more sustainable future for packaging and waste management.
FAQ
Compostable materials are biodegradable polymers designed to break down into natural elements in composting environments.
Common compostable materials include PLA, PBAT, and plant-based starch polymers.
Not always. Some bioplastics are compostable, but others may only be bio-based without being biodegradable.
They help reduce plastic pollution and provide sustainable alternatives to traditional plastic packaging.
