Brenntag Ultrapure DEF is available nationwide in multiple package sizes: FTL bulk and LTL bulk. Over 750 million gallons of Diesel Exhaust Fluid (DEF) has been delivered worldwide by Brenntag. Each of Brenntag’s 140 facilities across North America are ISO 9001 certified, allowing them to execute the highest quality processes and procedures for DEF logistics. An ISO 9001 Certification is important to the customer because each process is audited ensuring our deliveries remain on spec every time.