engineering brick

{{Short description|Type of brick}}

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File:Wolverton Viaduct carrying train on West Coast Main Line.jpg on the West Coast Main Line]]

Engineering bricks are a type of brick used where strength, low water porosity or acid (flue gas) resistance are needed. Engineering bricks can be used for damp-proof courses.{{cite web |title=Glossary of Terms |url=http://www.structuralengineerscambridge.co.uk/helpful-information/ctec-glossary-of-terms |website=www.structuralengineerscambridge.co.uk}}

Clay engineering bricks are defined in § 6.4.51 of British Standard BS ISO 6707-1;2014 (buildings & civil engineering works - vocabulary - general terms) as "fire-clay brick that has a dense and strong semi-vitreous body and which conforms to defined limits for water absorption and compressive strength".https://shop.bsigroup.com/ProductDetail/?pid=000000000030257212

Stronger and less porous engineering bricks (UK Class A) are usually blue due to the higher firing temperature{{cite web| url = http://www.ucl.ac.uk/earth-sciences/impact/geology/london/ucl/materials/brick| url-status = dead| archive-url = https://web.archive.org/web/20150704163541/http://www.ucl.ac.uk/earth-sciences/impact/geology/london/ucl/materials/brick| archive-date = 2015-07-04| title = Brick}} whilst class B bricks are usually red. Class A bricks have a strength of {{Convert|125|N/mm2||abbr=on}} and water absorption of less than 4.5%; Class B bricks have a strength greater than {{Convert|75|N/mm2||abbr=on}} and water absorption of less than 7%.{{Citation needed|date = November 2018}}

Accrington brick is a type of engineering brick that was used in the construction of the foundations in the Empire State Building in New York City.{{Citation needed|date=November 2018}}