The latex rubber stability test machine / apparatus tests the mechanical stability of concentrated natural and synthetic latex rubber when subjected to high speed mechanical stirring or mechanical shear.
Stirring is applied to the latex rubber at a constant of 14,000 rpm until the end point, or latex instability is reached.
The approach to the end point is usually indicated by a drop in meniscus of the latex, loss of turbulence and a change in the sound of stirring action.
The end point is determined by the first appearance of small pieces of coagulated rubber.
This end point is confirmed by the presence of an increased amount of coagulated rubber after 15 seconds additional rotation.
The end point in this case is the presence of approximately 1% of coagulum based on total solids.
The mechanical stability value for a latex is expressed as the number of seconds elapsed from the start of the test to the end point.
This is the test procedure for Natural latex, please contact us for information on the Synthetic latex testing procedure.
BS ISO 35 : 2006
Natural rubber latex concentrate. Determination of mechanical stability
BS ISO 2006-1 : 2009
Rubber latex, synthetic. Determination of mechanical stability. High-speed method
ASTM Designation D1076 - 15
Standard Specification for Rubber - Concentrated, Ammonia Preserved, Creamed and Centrifuged Natural Latex
ASTM Designation D1417 - 16
Standard Test Methods for Rubber Latices - Synthetic
S2T Group Ltd
125 High Road
Tel +44 1992 878 152