"The negotiations are not about compromising our standards," EU chief negotiator Ignacio Garcia Bercero told a joint news conference.
Chief U.S. negotiator Dan Mullaney said TTIP is meant to be a model of how two developed economies can cooperate to increase trade and investment in a way that doesn't "undermine protections for consumers, the environment and human health and safety."
Among the issues discussed in the second round were ways to harmonize U.S. and European regulations on medical devices, pharmaceuticals, chemicals, pesticides and automobiles. Energy, raw materials and services were also discussed.
Mullaney said the United States and European Union already recognize each other's regulations in some areas, such as wine and airline safety.
Negotiations will resume in Washington D.C. the week of Dec. 16. A separate meeting on financial services will be held in Brussels on Nov. 27.