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PostPosted: Sun Apr 09, 2017 1:03 pm 
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Are they different from Victorian bricks?


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PostPosted: Sun Apr 09, 2017 2:46 pm 
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Would that not depend on how they were made and then how long in the kiln for?

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PostPosted: Sun May 21, 2017 8:27 am 
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Blue engineering bricks are, seemingly. The DPC in many 1930s is solely engineering bricks.

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PostPosted: Sun May 21, 2017 10:21 am 
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The comments to date are correct.

The absorbency (or resistance to) is dependent on the way that it is made!
Engineering bricks either blue or red are most moisture resistant than other bricks.
Technical info as follows:-

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.

Clay engineering bricks are defined in British Standard BS 6100 "Glossary of building and civil engineering terms" as "brick sized fired clay units having a dense and strong semi vitreous body, conforming to defined limits for water absorption and compressive strength."[1]

Stronger and less porous engineering bricks (UK Class A) are usually blue due to the higher firing temperature[2] whilst class B bricks are usually red. Class A bricks have a strength of 125N/mm² and water absorption of less than 4.5%; Class B bricks have a strength greater than 75N/mm² and water absorption of less than 7%.

Accrington brick is one type of engineering brick.

See also[edit]
Staffordshire blue brick


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PostPosted: Sun May 21, 2017 11:17 am 
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No bricks are impervious to water,neither is concrete as they are both porous.
Sit a brick in a tub of water and watch what happens.


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PostPosted: Mon May 22, 2017 3:54 pm 
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:withstupid:

As Stevie says, no bricks are impervious to water.
The nearest you will get is a "Class A ENGINEERING Brick which as a water absorbtion rate of 4.5% (all as stated above.

Just as a point of interest, why do you ask?

davyp1


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