1, The full form of NBR is Nitrile Butadiene Rubber. It’s used on Academic & Science ,Chemistry in Worldwide

Acrylonitrile butadiene rubber (NBR), usually shortened to nitrile, is a unique elastomer. It can be produced by free-radical emulsion polymerization of butadiene with 15 to 45 percent acylonitrile either hot (hot rubber) or cold (cold rubber):

NBR grades with high acrylonitrile content have better oil and abrasion resistance, whereas grades with low acrylonitrile content have better low temperature flexibility and resilience. In general, nitrile rubbers have only moderate physical properties but good abrasion and excellent oil and hydrocarbon solvent resistance. However, they are not suitable for use with polar solvents. Nitrile rubbers also have low gas permeability particularly those with high nitrile content but poor ozone and modest heat resistance. To improve the physical properties, nitrile rubbers are sometimes carboxylated (XNBR) which improves their temperature resistance.

Many properties can be adjusted by varying the acrylonitrile content in the nitrile rubber. The higher the nitrile content, the higher the resistance to aromatic hydrocarbons and the lower the nitrile content, the better the low temperature flexibility.

• High Nitrile: > 45 % Nitrile
• Medium Nitrile: 30 – 45%
• Low Nitrile: < 30%

2, The full form of NBR is National Business Review. It’s used on News & Entertainment ,Journals & Publications in New Zealand

The National Business Review is a New Zealand online news publication aimed at the business sector. Businessman Barry Colman was the NBR’s publisher for 24 years, after buying it from John Fairfax & Sons in the 1980s. He sold it to Todd Scott in 2012.

3, The full form of NBR is National Board of Revenue. It’s used on Governmental ,Departments & Agencies in Bangladesh

National Board of Revenue (NBR): It is the highest administrative authority of tax administration. It is a body consists of a chairman member (tax-1), member (tax-2) law officer and a few first and second secretaries. The chairman and the members of this board are appointed by the government and they work under the direct control of the finance ministry of government.

NBR is responsible for formulation and continuous re-appraisal of tax-policies and tax-laws in the country like Bangladesh. The NBR is empowered to make necessary rules concerning income tax matters but not authorized to give any interpretation of any word used in any section of ITO.

It is a body consists of a chairman, members, officers, and secretaries. The chairman and the members of this board are appointed by the government and they work under the direct control of the finance ministry of the government.

4, The full form of NBR is Nilgiri Biosphere Reserve. It’s used on Regional ,Landscapes in India

The Nilgiri Biosphere Reserve is an International Biosphere Reserve in the Western Ghats and Nilgiri Hills ranges of South India. The Nilgiri Sub-Cluster is a part of the Western Ghats, which was declared a World Heritage Site by UNESCO in 2012. It is the largest protected forest area in India, spreading across Tamil Nadu, Karnataka and Kerala. It includes the Aralam, Mudumalai, Mukurthi, Nagarhole, Bandipur and Silent Valley national parks, as well as the Wayanad, Karimpuzha, and Sathyamangalam wildlife sanctuaries.

Nilgiri Biosphere Reserve exemplifies the tropical forest biome, and falls within the Western Ghats system which portray the confluence of Afro-tropical and Indo-Malayan biotic zones of the world.  Biogeographically, Western Ghats is the most important region and one of the noted ‘Hot Spots’ for speciation in the tropics.  The Biosphere Reserve is represented by unique and threatened ecosystems including a host of forest systems, ranging from seasonal rain forests in the low hills, tropical montane forests and grasslands in the higher reaches and moist deciduous to scrub through dry-deciduous towards the plains in the Eastern end.

The region is noted for its rich biodiversity. It houses about 3500 species of flowering plants, out of which 1500 are endemic to the Western Ghats.  The fauna consists of over 100 species of mammals, 550 species of birds, 30 species of reptiles and amphibians, 300 species of butterflies, and a large number of invertebrates and many more species that await discovery by scientists.