The test procedures described in the publication are used to determine the ability of grain refiners to reduce grain size during the solidification of aluminium alloys under standardized conditions, and to examine the structure of the grain refiner for uniformity. It has been reissued after a joint task group of the Aluminum Association’s Master alloys and additives division and the technical committee on product standards completed a round robin to evaluate the procedure described in TP-1.  

A separate report of the findings of the task group’s paper, “Report on the Interpretation of the Precision and Accuracy of the TP-1 Test When Multiple Laboratories Evaluate the Same Grain Refiner,” has also been published. The report ncludes details and evaluation of the round robin results. 

TP-1 is available from the Aluminum Association from