Advances in Ultrasonic Testing of Cementitious Materials
   Paper describes an ultrasonic device which is able to extract certain parameters of ultrasonic waves recorded continuously during the setting and hardening of mortar. [465 kB]
   http://www.iwb.uni-stuttgart.de/grosse/papers/Festschrift2.pdf

Hardness Testing
   Guide to hardness testing of materials. Brinell, Vickers and Rockwell test methods are illustrated, along with hardness conversion tables and charts.
   http://www.gordonengland.co.uk/hardness/

Materials Expertise for the Gas Industry
   Information about testing of butt welds, condensate, and materials used by gas industry (sinter metals, catalytic burners).
   http://www.xs4all.nl/~flscholt/