To apply for ISO certification, manufacturing companies must implement a quality management system that meets the requirements of the standard. They will then be audited by an ISO-approved certification body to ensure that they are compliant with the standard. If they pass this audit, they will receive their certificate.
The ISO itself does not perform audits or issue certifications, they simply create the standard. A company that wants to earn ISO certification must do so through a third-party provider that can assess the implementation of the ISO standards. When a company like Vinyl Technology says they are ISO 9001:2015 certified, rest assured that this compliance has been verified, with documentation and certificates to prove it.