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 04/2013

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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 8/2016

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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 06/2023

26th Eurosymposium: Ceramic production – economic and technical future

The 26th Eurosymposium of the KI Keramik-Institut GmbH took place in Meissen, Germany, on 6 and 7 September 2023 in bright September sunshine. Almost 100 participants gathered at the Hotel Burgkeller...

Issue 05/2013

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 01/2014

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....