For brands, importers, distributors, and retailers sourcing compostable packaging for the California market, product requirements often extend beyond size, thickness, strength, and printing.

Buyers may also consider compostability certification, California packaging requirements, PFAS and fluorine-related criteria, and California Proposition 65.

These requirements are related to the same product, but they do not serve the same purpose.

For B2B buyers, understanding the difference helps make product development and sourcing more straightforward. For manufacturers, it means understanding not only how to produce the packaging, but also which requirements may be relevant to the market where the product will eventually be sold.

Ecopro Manufacturing Co., Ltd. supports international B2B customers with custom compostable packaging, certification experience, and relevant product documentation for target-market projects.

1. Proposition 65 Is About Exposure, Not Product Certification

California Proposition 65, formally known as the Safe Drinking Water and Toxic Enforcement Act of 1986, is sometimes misunderstood as a product certification or a general material prohibition.

It is neither.

Proposition 65 requires businesses to provide a clear and reasonable warning before knowingly and intentionally exposing individuals to chemicals listed by the State of California as causing cancer, birth defects, or other reproductive harm, unless an applicable exception applies.

The important word is exposure.

The presence of a listed chemical in a material or finished product does not automatically mean that a Proposition 65 warning is required.

The relevant question is whether the product results in an exposure that reaches a level requiring a warning under Proposition 65.

For packaging buyers, this means Proposition 65 should not be treated as:

“Does this product have a Prop 65 certificate?”

There is no general government-issued “Proposition 65 Certified” product certificate.

A more accurate question is:

“Does the intended use of this product create a Proposition 65 exposure that requires a warning?”

2. How Does Proposition 65 Relate to Compostable Packaging?

Compostability and Proposition 65 address different aspects of a packaging product.

Compostability standards such as ASTM D6400 and EN 13432 evaluate whether products meet defined requirements relating to biodegradation, disintegration and other compostability criteria under specified conditions.

Certification schemes such as BPI and OK compost provide third-party certification based on applicable standards and additional programme requirements.

Proposition 65, on the other hand, focuses on exposure to chemicals listed by California and whether a consumer warning is required.

These should therefore be treated as separate compliance areas.

For the California market, compostable plastic products also have specific requirements governing the use of the term “compostable.” CalRecycle currently states that compostable plastic products must meet ASTM D6400-19, together with additional California labeling and material requirements.

For B2B buyers, the practical takeaway is simple:

A compostability certification answers one set of questions.

Proposition 65 answers another.

A professional packaging project may need to consider both.

3. Where Do PFAS and Fluorine Requirements Fit?

PFAS is another area that is often discussed alongside Proposition 65, but the two should not be treated as the same requirement.

Certain individual PFAS chemicals may appear on the Proposition 65 list. In those cases, Proposition 65 still focuses on whether the resulting exposure requires a warning.

Separately, compostable packaging can also be subject to specific fluorine-related requirements under California law or third-party certification programmes.

For example, California currently requires compostable consumer products to contain less than 100 ppm total organic fluorine.

BPI also has its own fluorinated-chemical requirements for certified products. BPI requires no intentionally added fluorinated chemicals and test results showing less than 100 ppm total organic fluorine.

This distinction is important because:

Proposition 65, California compostable-product requirements, and BPI certification may all address chemical considerations, but they do so through different regulatory or certification frameworks.

For buyers, the goal should not be to combine them into one general “chemical compliance” requirement.

The goal is to understand which requirement applies to which part of the product and market.

4. What Should Buyers Focus on for California-Bound Compostable Packaging?

For most B2B projects, the discussion does not need to become unnecessarily complicated.

Four areas usually provide a practical starting point.

Intended Application

The first question is how the packaging will actually be used.

A produce bag, trash bag, food-contact bag, courier mailer, or retail packaging product may have different performance and market requirements.

Application should therefore come before certification selection.

Compostability Requirements

For California compostable plastic products, ASTM D6400-19 is particularly relevant to the legal use of compostable claims. Third-party certification, such as BPI certification for eligible products, may also form part of the project depending on the product and intended claim.

Market-Specific Requirements

California may also have requirements relating to chemical exposure, fluorine, labeling and environmental marketing claims.

These requirements should be considered separately rather than assuming that one certification automatically covers every California requirement.

Supporting Product Information

For professional B2B buyers, clear product specifications, certification information and relevant technical documentation make internal procurement and compliance reviews easier.

This is also where an experienced manufacturer can add value: not by turning the project into a long compliance checklist, but by understanding what the customer is trying to sell, where it will be sold, and what information is relevant to that market.

5. Why Manufacturer Experience Matters

For international packaging projects, manufacturing experience is not only about whether a factory can make a bag.

The supplier also needs to understand:

• · the application;
• · the required product performance;
• · the target market;
• · the relevant compostability requirements;
• · customization and printing;
• · production consistency;
• · and the supporting documentation expected by the customer.

Ecopro Manufacturing Co., Ltd. is a compostable packaging manufacturer based in Dongguan, China.

The company operates an approximately 18,800-square-meter manufacturing facility with more than 60 automated production lines and an annual production capacity of approximately 15,000 tons.

More than 95% of production is exported, with key markets including the United States, Canada, Europe, the United Kingdom, Australia, and New Zealand.

For international customers, Ecopro supports several areas of custom packaging development.

Application-Based Product Development

Compostable bags and films can be developed around the intended application, with suitable material systems, dimensions, thickness, bag structures, printing, and packaging configurations.

Compostability Certification Experience

Depending on the product, material system, target market, and applicable certificate scope, Ecopro has experience supporting products associated with certification schemes and standards including ASTM D6400/BPI, EN 13432, OK compost HOME, OK compost INDUSTRIAL, AS 5810, and AS 4736.

Certification applicability should always be understood according to the specific product and certificate scope rather than assumed across an entire product category.

International B2B Manufacturing

For private-label and custom packaging projects, product development, manufacturing capability, certification experience, and customer documentation can be managed as part of the same project.

For buyers, this makes it easier to move from an initial packaging idea to a product that fits the intended application and market.

Frequently Asked Questions

Does the presence of a Proposition 65-listed chemical automatically mean a warning is required?

No.

The presence of a listed chemical does not automatically trigger a warning.

Proposition 65 focuses on exposure. Where an applicable safe-harbor level exists, it may help determine whether the anticipated exposure requires a warning.

Is Proposition 65 a product certification?

No.

Proposition 65 is a California warning law relating to exposure to listed chemicals. It does not create a general “Prop 65 Certified” product certification.

What is the difference between ASTM D6400 and BPI certification?

ASTM D6400 is a technical standard covering compostable plastics intended for commercial composting environments.

BPI is a third-party certification programme. BPI currently uses ASTM D6400 as the base standard for products evaluated under its commercial compostability certification programme and applies additional programme requirements.

So the terms are related, but they are not interchangeable:

ASTM D6400 = standard

BPI = certification programme

How do PFAS requirements differ from Proposition 65?

Proposition 65 concerns exposure to specific chemicals included on California’s Proposition 65 list.

PFAS and fluorine requirements may also arise separately under California rules for products marketed as compostable or under certification programmes such as BPI.

They should therefore be treated as separate but potentially related requirements.

Does a compostability certification automatically cover California Proposition 65?

No.

Compostability certification evaluates compostability-related criteria.

Proposition 65 deals with exposure to listed chemicals and warning requirements.

Both may be relevant to the same product, but they address different questions.

Conclusion

For B2B buyers, the most important point is not to treat Proposition 65, PFAS requirements, compostability standards, and certification programmes as interchangeable.

Each addresses a different part of California market requirements.

For compostable packaging manufacturers, this creates an opportunity to provide more than simply a finished bag.

An experienced supplier can bring together:

product development,

compostability certification experience,

manufacturing capability,

and relevant supporting documentation.

For Ecopro, understanding the target market is part of developing the right packaging solution—not something considered only after production.

If you are developing compostable packaging for the California or wider U.S. market, contact the Ecopro team to discuss your application, product specifications, certification requirements, private-label packaging, or sample needs.

Email: sales_09@bioecopro.com
WhatsApp: +86 15218784866