Theta Industries dilatometer, high temperature viscometer, DTA/TGA, quenching deformation dilatometer Theta Industries, Inc. Theta Industries, Inc. Logo
Viscometer Comparison Chart
Specializing in the high temperature viscometer

Theta Industries has been producing the finest precision high temperature viscometers since 1966 with proven patented technology. Our viscometers come in three major designs: rotating viscometer, parallel plate viscometer and bending beam viscometer. These can be purchased in any standard design shown below or custom ordered to the customers specifications. All viscometers are completely controlled through our fully automatic DilaSoft I software. Easy to set up and run with the data saved in standard ASCII format for easy import into any analysis program. Theta's own analysis software comes complete with pre-designed graphs for all standard plots and is very easy to use yet extremely powerful. Theta's viscometers have been in constant use in industrial, scientific, education and research capacities for over 40 years. Our DilaSoft I software is continually updated and improved. We strive to produce the finest precision viscometers for our customers and stand behind our equipment. Please see the descriptions below and fill out one of our automated on-line Inquiry Forms for a specific model viscometer. Thank you for your interest in Theta Industries high temperature viscometers. We look forward to hearing from you.

This chart compares our most popular Viscometer instruments. Other models are available as well as completely custom designed and manufactured equipment.

Theta Industries, Inc. Viscometer Comparison Chart
Rheotronic II Rheotronic III Rheotronic IV

high temperature viscometer rotating high temperature viscometer parallel plate high temperature viscometer bending beam
Description Rotating Parallel Plate Bending Beam
Range 5 to 50x10 6 cP 10 9 to 10 12 cP 10 10 to 10 14 cP
Measuring Head RV-2 precision head with digital readout High precision LVDT
Specimen Size (len. x dia.) 40 cm 3 beaker 6 mm x 8 mm 3-6 mm x 55 mm
Specimen holder & push rods Al 2 O 3 rods, rotor & beaker SiO 2 SiO 2
Thermocouple S, K K K
Temperature range Ambient to 1800°C Ambient to 1000°C Ambient to 1100°C
Furnace type MoSi 2 Nichrome split SiC tube
Atmosphere air, *gas air, *gas air, *gas
Utility 120/220 VAC 50/60 Hz
Size (l x d x h) inches 22 x 22 x 40 22 x 22 x 36 22 x 22 x 36

View or download the high temperature Rotating Viscometer Specification Sheet (in Adobe PDF format) 

Options DilaSoft I for Windows software for advanced computer control, data collection & analysis
* = optional Platinum beaker & rotor.
Constant temperature circulator
Constant temperature circulator.
20 bit data acquisition.


Theta Industries has been the industry leader in thermal physical properties measurement and manufacturing of scientific test equipment including the Dilatometer, high temperature Viscometer and DTA/TGA instruments for over 40 years. We remain dedicated to bringing our customers the finest in both software and hardware to create the most advanced thermal analysis equipment available. We offer a full range of instruments for industrial, scientific, research and education including Dilatometers, quench/deformation dilatomers and high temperature Viscometers.

For information about the price and availability of Theta's latest software and equipment offerings call, write, Fax or E-mail to the address below for a prompt response. Or fill out our automated on-line Inquiry Forms right here!

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Theta Industries, Inc.
26 Valley Road
Port Washington, NY 11050
Phone: 516-883-4088 Fax: 516-883-4599 E-mail:

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High Temperature Viscometer comparison chart from Theta Industries, Inc.