As compostable packaging becomes more widely used, certification systems are essential to verify environmental claims.
One of the most recognized compostability certification systems in the world is OK Compost certification, issued by TÜV Austria.
This certification verifies that materials can safely break down under specific composting conditions without harming the environment.
OK Compost certification is widely used in Europe and internationally to ensure that compostable plastics meet strict scientific standards.
For an overview of global certification systems, see our guide to compostable certifications.
What Is OK Compost Certification?
OK Compost certification is a third-party verification program developed by TÜV Austria to confirm that materials are compostable.
The certification ensures that products:
- biodegrade during composting
- disintegrate physically during the composting process
- leave compost safe for plant growth
- contain minimal heavy metals
Products that pass these tests can display the OK Compost logo, which signals compliance with recognized compostability standards.
The certification is based on international standards such as EN13432 and ASTM D6400.
Types of OK Compost Certification
TÜV Austria provides several types of OK Compost certification depending on the composting environment.
OK Compost INDUSTRIAL
This certification verifies that a product can break down in industrial composting facilities.
Industrial composting typically involves:
- temperatures above 55°C
- controlled moisture levels
- active microbial conditions
These environments allow materials to break down more quickly.
OK Compost HOME
The OK Compost HOME certification confirms that a product can biodegrade in home compost systems.
Home compost conditions are more variable and usually involve lower temperatures.
Because of this, materials must meet stricter requirements to qualify for home compost certification.
OK Compost SOIL
This certification applies to materials designed to biodegrade directly in soil environments.
It is often used for agricultural films or biodegradable plant materials.
OK Biodegradable (Marine / Soil)
TÜV Austria also provides certifications for materials designed to biodegrade in specific environments such as soil or marine conditions.
These certifications verify biodegradation under controlled laboratory conditions.
OK Compost Certification Requirements
To receive OK Compost certification, materials must pass several scientific tests.
Biodegradation
The material must convert most of its carbon into carbon dioxide within a defined time period during composting.
Disintegration
During the composting process, the product must break down physically so that no visible fragments remain.
Ecotoxicity
Compost produced from the material must support plant growth and contain no harmful residues.
Heavy Metal Limits
Materials must contain very low levels of heavy metals to ensure compost safety.
These requirements ensure that compostable materials behave similarly to natural organic waste.
OK Compost vs Other Compostable Certifications
Several compostability certification systems exist worldwide.
| Certification | Region | Composting Type |
|---|---|---|
| OK Compost | Europe / Global | Industrial / Home |
| BPI Certification | North America | Industrial |
| AS4736 | Australia | Industrial |
| AS5810 | Australia | Home |
Learn more about:
Products That Use OK Compost Certification
Many compostable plastic products use OK Compost certification to demonstrate environmental compliance.
Examples include:
- compostable food packaging
- compostable garbage bags
- compostable shopping bags
- compostable coffee capsules
These products are commonly used in regions with established organic waste collection systems.
How to Verify OK Compost Certification
When purchasing compostable products, it is important to verify certification carefully.
Check the certification logo
Look for the official OK Compost logo issued by TÜV Austria.
Verify certification numbers
Certification numbers can be checked through TÜV Austria's certification database.
Request supplier documentation
Manufacturers should provide certification certificates and testing reports.
Conclusion
OK Compost certification is one of the most widely recognized compostability certifications worldwide.
By verifying that materials break down safely in composting environments, the certification helps prevent misleading environmental claims and supports sustainable waste management systems.
For businesses sourcing compostable packaging, understanding OK Compost certification is essential when evaluating environmentally responsible materials.
