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N-Isopropyl-N′-phenyl-1,4-phenylenediamine (often abbreviated IPPD) is an organic compound commonly used as an antiozonant in rubbers. [1] Like other p-phenylenediamine -based antiozonants it works by virtue of its low ionization energy, which allows it to react with ozone faster than ozone will react with rubber. [2] This reaction converts it to the corresponding aminoxyl radical (R 2 N–O ...
o-Phenylenediamine ( OPD) is an organic compound with the formula C 6 H 4 (NH 2) 2. This aromatic diamine is an important precursor to many heterocyclic compounds. OPD is a white compound although samples appear darker owing to oxidation by air. It is isomeric with m -phenylenediamine and p -phenylenediamine .
Recycling codes. Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process. The presence on an item of a recycling code, a chasing arrows logo, or a resin code, is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.
Vietnam Standards ( TCVN, Vietnamese: Tiêu chuẩn Việt Nam, lit. 'Standards of Viet Nam'), or the Vietnamese National Standards ( Vietnamese: Tiêu chuẩn Quốc gia Việt Nam, lit. 'National Standards of Vietnam'), are the national standards of Vietnam issued by the Vietnam Standard and Quality Institute, part of the Directorate for ...
ISO 3166-1 ( Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization .
Wurster's blue is the trivial name given to the radical cation of the colorless chemical N, N, N ′, N ′-tetramethyl- p -phenylenediamine, also known as TMPD. This is an easily oxidised phenylenediamine, which loses two electrons in one-electron oxidation steps; the radical cation is a characteristic blue-violet colour, which gives the ...
Current ISO 3166 country codes. The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.
Emergency service response codes are predefined systems used by emergency services to describe the priority and response assigned to calls for service. Response codes vary from country to country, jurisdiction to jurisdiction, and even agency to agency, with different methods used to categorize responses to reported events.