The hidden pitfalls of glazing structural ceramics

At KI Keramik-Institut GmbH Meißen, lots of experience has been gathered in the study of defect patterns on industrially manufactured, glazed and engobed structural ceramics.

The paper documents a recent case of damage involving the familiar problem of “discoloration of roof tile glazes due to anhydrite washout”. It shows that there is another, similar defect pattern that cannot be attributed to the CaO content. By profiling actual pertinent tests and analyses, the author attempts to shed light on the causes behind the subject defect pattern. Helpful hints and suggestions are offered on how to...

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Issue 2013-04

The hidden perils of glazing building ceramics

1 Problem description In the late 1990s, an incident was reported in the roofing tile industry in which a large number of around one- to two-year-old glazed roofing tiles had become discoloured, as...

Issue 2016-8

Engobes and glazes on ceramic building products – recommendations for testing to certify durability

In the past, some glazed roofing tiles have exhibited damage that only became visible after a certain period of time. Moreover, not all tiles in one production batch were affected. Producers of glazed...

Issue 2013-05

Frost resistance of ceramic building materials – factors of influence, standards and new test methods (Part 2)

5 Test method pore-size distribution (PSD) and frost damage Frost resistance is decisively dependent on tensile strength, porosity and pore-size distribution. In principle, low porosity and high...

Issue 2014-01

Roof+Timber International showcasing innovations from the roof tile industry

The Braas roofscape experience Braas will be presenting their complete single-source roof system, including a wide variety of roof tiles like the new, improved Achat 10V curved interlocking tile....

Rheinbach-based WZR wins NRW Efficiency Prize

Light ceramics carry heavy roof tiles

WZR ceramic solutions has been awarded the Northrhine-Westphalian Efficiency Prize for 2013 from Effizienz-Agentur NRW for developing what they call their “PT-Keramik“. This innovative high-tech...