ISCC Certification Guide
ISCC is a sustainability certification for biofuel feedstocks. Collectors and refiners use it to document where used cooking oil came from and how it moved from the kitchen to the plant.
Grease.org is not an ISCC certifier and does not issue certificates. Buyers ask for that paperwork because they need a chain of custody before the oil becomes renewable diesel or aviation fuel.
A chain of custody is a record of the kitchen, the collector, and the plant. Grease.org can describe that path. If a buyer requires a certificate, it comes from a certifier. Grease.org is not an ISCC certifier and does not issue certificates.
What the certificate is actually certifying
ISCC and similar schemes certify a chain, not a single drum. The point is to show that a waste fat used for fuel was a waste, that it was not a freshly grown food oil labeled as a waste, and that each company that held it can be named. A kitchen at the start of that chain has a small part: identify the site, keep used cooking oil separate from other wastes, and use a collector who can pass the paperwork forward. A kitchen does not become an ISCC-certified fuel producer by filing a pickup log.
The collector and the first processor carry more of the system. They need mass-balance records, so the tons that go out as a certified feedstock are not greater than the tons that came in. They need to show that trap grease was not quietly relabeled as used cooking oil. Brown grease can have its own path. It should not borrow the path written for fryer oil. Auditors look for that swap because the two wastes are easy to mix on a truck and very different in a sustainability claim.
GREASE.ORG can hand a kitchen a consistent pickup record. The company does not issue ISCC certificates and does not tell a fuel plant that a load is certified. If a buyer requires a certified supply, that requirement has to be in the contract with a certified collector or processor, and the kitchen has to follow the handling rules that contract names. A logo on a brochure is not the certificate.
Practical habits that survive an audit are dull. One container for fryer oil. A lid. No rainwater. No food trash as weight. A ticket with the date, the site, and the volume. The same habits make a better yellow-grease load even when nobody asks for a certificate. Certification is the paperwork layered on top of a clean tank, not a substitute for the tank.