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

Making a sustainability claim is easy. Proving it is hard. When you buy post consumer recycled (PCR) packaging, your brand's credibility rides on one question: can you prove the recycled content is real? A supplier's word is not enough. You need a third party certificate, and you need to know which one actually matters for your product.

This guide breaks down every major recycled content certification standard, what they require from suppliers, what they provide for buyers, how long they take, and how to read the documents you receive. If you are sourcing PCR bottles for beauty, wellness, or home care products, this is the reference you will come back to.

GRS: The Chain of Custody Standard

The Global Recycled Standard is owned by Textile Exchange, a nonprofit originally focused on textiles that now covers any product containing recycled content, including plastic packaging. GRS was originally developed by Control Union Certifications and later transferred to Textile Exchange.

What GRS Requires From Suppliers

GRS is the strictest of the common certifications. Every facility in the supply chain, from the recycler to the final product manufacturer, must hold its own GRS scope certificate. If any link in the chain is uncertified, the final product cannot carry the GRS label.

The minimum recycled content is 20% for business to business use and 50% for consumer facing labeling with the GRS logo. Products between 20% and 49% use a "GRS (No Label)" designation for B2B transactions only.

Beyond recycled content, GRS requires suppliers to meet social and environmental criteria based on ILO labor standards. That means chemical restrictions, water use controls, and worker rights protections. A GRS audit is broader and more expensive than a content only audit because it covers the entire production process.

What GRS Provides For Buyers

Two documents matter: the scope certificate and the transaction certificate. The scope certificate proves a company is certified to produce GRS compliant products. The transaction certificate (TC) ties a specific shipment to the standard. For every order, you should request a TC. It lists the exact material (rPET, rHDPE), the supplier name, location, and the valid dates.

Most certification bodies maintain a public database where you can verify any certificate number independently.

Timeline and Cost

Textile Exchange estimates 6 to 8 weeks from application to certification for companies that are operationally ready. In practice, preparation adds 2 to 4 months, making the total timeline 4 to 8 months. Certification costs $7,000 to $9,000 for GRS, with annual surveillance audits running $2,000 to $8,000. Approved auditors include SCS Global Services, Control Union, Intertek, Bureau Veritas, Ecocert, and SGS, among others.

Note: Textile Exchange is transitioning GRS and its sibling standard RCS into a new Materials Matter Standard, with criteria released December 2025 and mandatory adoption by December 2027.

RCS: The Lighter Alternative to GRS

The Recycled Claim Standard (RCS) is also owned by Textile Exchange and shares the same chain of custody framework as GRS. The critical difference: RCS is a single attribute certification. It verifies recycled content percentage and nothing else. No social criteria, no environmental criteria, no chemical restrictions.

RCS requires just 5% minimum recycled content. Products with 100% recycled content use "RCS 100" and blended products use "RCS Blended." Certification costs $3,000 to $5,000, significantly less than GRS because the audit scope is narrower.

For brands that only need to verify a recycled content claim and do not need to communicate about responsible sourcing practices, RCS is the faster and cheaper option.

SCS Recycled Content Standard: The Percentage Auditors

The SCS Recycled Content Standard from SCS Global Services takes a different approach. It is not a chain of custody standard. It is a direct, data driven audit of a manufacturer's material tracking, production processes, and accounting to verify the exact percentage of recycled content in a product.

The result is a precise, verifiable claim: "Conforms to the SCS Recycled Content Standard for a Minimum of 50% Post Consumer Recycled PET Resin." This specificity is valuable for brands making numerical claims on packaging labels, especially when meeting regulations like California's SB 54 that require hitting specific PCR percentage targets.

SCS Global Services is also one of the approved certification bodies for GRS, ISCC PLUS, and several other standards, but the SCS Recycled Content Standard is their proprietary certification program.

ISCC PLUS: The Mass Balance Standard

International Sustainability and Carbon Certification (ISCC) PLUS is the standard built for the circular economy, and it is the only major certification that handles chemical recycling. Where GRS tracks physical material through the chain, ISCC PLUS uses mass balance accounting.

How Mass Balance Works

In chemical recycling, plastic waste is broken down into base chemicals and mixed with virgin feedstock in a continuous process. Physical separation is impossible. Mass balance tracks the quantity of recycled input entering the system and allocates it proportionally to the output. If a cracker processes 10% recycled naphtha and 90% fossil naphtha, then 10% of the output polymers can be sold as recycled content.

Think of it like green electricity: the electrons in your outlet are mixed, but your purchase is tracked through certificates. ISCC requires reconciliation within 3 month periods, so companies cannot bank claims indefinitely.

ISCC Variants Explained

ISCC is not one certification. It is a family:

ISCC PLUS covers bio based and circular (recycled) raw materials for consumer goods, packaging, and industrial chemicals. This is the one that matters for packaging. It is also recognized by Amazon's Climate Pledge Friendly program and the UK Plastic Packaging Tax.

ISCC EU is a mandatory certification for biofuels sold in the EU under the Renewable Energy Directive (RED II). It also covers maritime fuels globally and crop based feedstocks under California's Low Carbon Fuel Standard.

ISCC CORSIA verifies sustainability criteria for aviation fuels under ICAO's Carbon Offsetting and Reduction Scheme for International Aviation. Also useful for verifying GHG scores for US SAF tax credits.

ISCC CFC (Carbon Footprint Certification) can be added to ISCC PLUS or used standalone to quantify the carbon footprint of conventional materials that are not eligible for ISCC PLUS.

Timeline and Cost

A well prepared company can certify in 6 to 10 weeks. Starting from scratch, expect 3 to 6 months. Total first year cost: $15,000 to $40,000, including $3,000 to $8,000 in ISCC system fees and $5,000 to $15,000 in audit costs. Certificates are valid for 12 months.

What Buyers Get

Each shipment from an ISCC PLUS certified supplier comes with a sustainability declaration specifying the type and quantity of recycled material, the chain of custody method used, and GHG emission data. The ISCC transparency database lets anyone look up valid certificates.

EcoVadis: Rating the Supplier, Not the Product

EcoVadis is fundamentally different from GRS, RCS, and ISCC. It is not a product certification. It is a company level sustainability rating. EcoVadis scores a supplier's overall ESG performance on a 0 to 100 scale across environment, labor practices, ethics, and sustainable procurement.

Medal thresholds (as of 2026): Platinum (84+), Gold (73+), Silver (66+), Bronze (58+). These are percentile based, adjusted dynamically against all companies rated in the past 12 months.

For packaging buyers, EcoVadis tells you whether your supplier operates responsibly as a company. It does not tell you how much recycled content is in a specific bottle. Use it alongside product certifications, not instead of them.

Cradle to Cradle: The Full Lifecycle Lens

Cradle to Cradle (C2C) certification evaluates products across five categories: material health, circular economy, clean air and climate protection, water and soil stewardship, and social fairness. Certification levels run from Bronze through Platinum.

Notably, single use plastic packaging and standalone plastic packaging products are not eligible for Bronze or Silver, only Gold or above, unless they are part of a refill or reuse system. This makes C2C more relevant for reusable packaging than for standard PCR bottles.

The Future: Blockchain Traceability

Blockchain based traceability platforms like Circularise and Plastic Bank are emerging as supplements to traditional certifications. They create immutable records of material flow from collection to finished product, potentially replacing paper based transaction certificates with real time digital tracking.

The technology is still early. Most blockchain traceability in packaging is pilot stage, concentrated in large brand partnerships. But the direction is clear: digital chain of custody will eventually complement or replace some of the manual verification that GRS and ISCC rely on today.

Which Certificate Do You Actually Need?

For most small to mid size brands buying PCR bottles:

Start with your supplier's existing certifications. If they hold GRS with a scope certificate, request a transaction certificate for your specific order. If they are ISCC PLUS certified, ask for the sustainability declaration.

If you are making specific percentage claims on your label ("Made with 50% PCR"), the SCS Recycled Content Standard or a GRS transaction certificate gives you the strongest backing.

If you are meeting California SB 54 requirements, GRS or SCS Recycled Content certifications with specific percentage verification are the most directly applicable.

If your supplier does chemical recycling, ISCC PLUS is the standard. GRS does not cover mass balance accounting.