LABORATORY SUPPLIES AND CHEMICALS 



1067a 



STANDARD METHOD FOR DETER- 

 MINING THE SOFTENING POINT OF 

 BITUMINOUS MATERIALS OTHER 

 THAN TAR PRODUCTS 



1067a OPERATION Carefully melt sample and 

 till ring with material to be tested. Remove any excess. 

 Place ball in center of ring and suspend in beaker 

 containing approximately 400 c. c. of water at a tem- 

 perature of 5 C. Softening point is temperature at 

 which specimen has dropped one inch. Successive tests 

 should average within 3 C. For temperatures above 

 95 C., gylcerine should be used instead of water. 



RING AND BALL 



APPARATUS Brass ring 15.875 m.m. ($ in.) in 

 diameter, 6.35 m.m. (J4 in-) deep, 2.38125 m.m. (^ in.) 

 wall, suspended, 25.40 m.m. (1 in.) above bottom of 

 beaker. Steel ball 9.525 m.m. (ft in.) in diameter, 

 weighing between 3.45 g. and 3.50 g. Standardized 

 thermometer. Glass Beaker, approximately 600 c.c. 

 capacity. 

 Price $10.00 



1068 



DUCTILITY MACHINE. Adapted for ductility and elonga- 

 tion tests under various conditions of temperature and 

 speed. This machine has a standard stretch of 150 centi- 

 meters with a 5 cm. or 60 cm. speed per minute. Three 

 test pieces can be tested at one time. It is constructed 

 entirely of metal, porcelain lined. Furnished with direct or alternating 

 current motor, including three briquette moulds $200.00 



1069 PENETROMETER. Latest im- 

 proved form with finest ad- 

 justment. By testing the 

 depth to which, under a 

 definite load and during a 

 given time the Standard 

 Needle will penetrate, you can 

 determine the consistency of 

 the asphalt cement or similar 

 material. The stationary dial 

 is graduated into 100 divisions 

 of 1/10 m.m, each. The 

 indicator works automatically 

 and gives absolutely correct 

 readings $55.00 



1069 



1070 



1070 



ADHESION MACHINE, Kirschbraun's. For testing comparatively the 

 adhesive strength of asphalt as a binder for mineral 

 conglomerates in the construction of asphalt pave- 

 ments. Complete with two sample cups and in- 

 structions 23.00 



1070a EXTRA CUP for No. 1070 Adhesion Machine 1.00 



