Technical barriers to trade (TBTs), a category of nontariff barriers to trade, are the widely divergent measures that countries use to regulate markets, protect their consumers, or preserve their natural resources (among other objectives), but they also can be used (or perceived by foreign countries) to discriminate against imports in order to protect domestic industries.
The 2012 classification of non-tariff measures (NTMs) developed by the Multi-Agency Support Team (MAST), a working group of eight international organisations, classifies TBTs as one of 16 non-tariff measures (NTMs) chapters.
In this classification, TBTs are classified as chapter B and defined as "Measures referring to technical regulations, and procedures for assessment of conformity with technical regulations and standards, excluding measures covered by the WTO's SPS Agreement".
Chapter B also includes all conformity-assessment measures related to technical requirements, such as certification, testing and inspection.
[1] Other examples of TBTs are rules for product weight, size, or packaging; ingredient or identity standards; shelf-life restrictions; and import testing and certification procedures.