How to Verify Recycled Content: A Guide to GRS, SCS, and ISCC PLUS Certificates

Making a sustainability claim is easy. Proving it is hard. When you choose post consumer recycled (PCR) packaging, your brand's credibility depends on the actual percentage of recycled material in your bottles. A supplier's promise is not enough. You need independent verification, which comes from a recycled content certificate. These certificates are the only way for a brand to prove its packaging meets sustainability targets and to give customers a credible reason to trust its claims.

This guide explains the most common recycled content certification standards, what they mean for your packaging, and how to use them to validate supplier claims. Using these certificates correctly helps you avoid greenwashing and back up your environmental commitments with proof.

Why Your Brand Needs More Than a Supplier's Word

The PCR packaging supply chain is complex. Without a formal verification process, it is difficult to confirm that the plastic resin used to make your bottles came from post consumer sources. Relying only on a supplier's declaration exposes your brand to significant risks, including consumer mistrust and non-compliance with regulations like California's SB 54, which mandates specific PCR percentages.

Third party certification creates an objective, auditable system for tracking recycled materials. Certified suppliers undergo rigorous inspections to validate their processes, from material sourcing to final production. For your brand, this means you can confidently state your PCR percentage on your label, in marketing materials, and in regulatory filings. It transforms a claim into a verifiable fact, a necessary step for building a transparent and sustainable brand.

The Three Main Recycled Content Certificates Explained

While several organizations offer certification, three standards are the most common in the packaging industry: the Global Recycled Standard (GRS), the SCS Recycled Content Standard, and International Sustainability and Carbon Certification (ISCC) PLUS. Each has a different focus, but all are designed to bring integrity to recycled content claims.

GRS (Global Recycled Standard): The Chain of Custody Champion

The Global Recycled Standard is an international standard that verifies recycled content and tracks it through the supply chain. Its main strength is its strict chain of custody requirements. This process maintains the identity of the recycled material from the recycler to the final product.

Beyond just recycled content, GRS also sets criteria for social and environmental processing. A GRS certified facility must meet standards for chemical restrictions, water use, and worker rights. For brands, a GRS certificate signals both material traceability and responsible production practices.

SCS Recycled Content Standard: The Percentage Auditors

The SCS Recycled Content Standard from SCS Global Services focuses on one task: accurately verifying the percentage of recycled content in a product. SCS auditors conduct a detailed review of a manufacturer's material tracking, production processes, and accounting to confirm the exact amount of pre consumer or post consumer material used.

The certification results in a clear, verifiable percentage claim, such as "Conforms to the SCS Recycled Content Standard for a Minimum of 50% Post-Consumer Recycled PET Resin." This specificity is critical for brands making precise claims on their packaging, especially for meeting regulations like SB 54 that require hitting specific percentage targets. It is a direct, data driven audit of the material composition.

ISCC PLUS: The Mass Balance Approach

ISCC PLUS is a certification system for the circular economy and bioeconomy that covers a wide range of materials, including chemically recycled plastics. Chemical recycling breaks down plastic waste into basic chemical components to create new polymers. In these systems, recycled and virgin feedstocks are often mixed in a continuous process, making physical segregation impossible.

To manage this, ISCC PLUS uses a "mass balance" accounting method. This approach tracks the quantity of recycled material entering the system and allocates it to a proportional quantity of the output product. While the specific molecules in the final bottle may not all be from a recycled source, the system guarantees that for every ton of ISCC PLUS certified product sold, a corresponding ton of recycled feedstock was processed. This system supports the growth of new recycling technologies where physical separation is not practical.

How to Read and Use a Recycled Content Certificate

A certificate is only useful if you know what to look for. When a supplier provides a certificate, first check that it is valid and applies to the product you are buying. Most certification bodies have a public database where you can look up the certificate number to confirm its authenticity.

Next, distinguish between a "scope certificate" and a "transaction certificate." A scope certificate proves that a company is certified to produce GRS or ISCC PLUS compliant products. It does not apply to a specific batch of material. A transaction certificate (TC) is lot specific and confirms that a particular shipment you received was produced according to the standard. For the highest level of assurance, you should request a transaction certificate for your order.

Finally, check the details. Verify the certificate lists the correct material (e.g., rPET), the supplier's name and location, and the valid dates. If anything is unclear, ask your supplier for clarification.