Labino Softening Point

The Model SP-3A was conceived, developed and patented by Dominick Labino, an internationally renowned glass scientist and artisan, who recognized the glass industry's need for a simple, rapid softening point determination.

This simple, low cost device is a modified parallel plate viscometer whose results correlate very well with Littleton Softening Point Temperatures that are determined according to ASTM C-338. Solid glass samples are used instead of glass fibers. Consequently, sample preparation is easier, particularly for glass compositions that are difficult or impossible to form fibers.

Model SP-3A


A complete and compact bench-top instrument for approximating the softening point of solid glass pieces by the Labino Method.

The Model SP-3A is a unique, patented system that was designed as a low cost instrument for quickly and easily measuring the Littleton Softening Point of glasses without pulling fibers. The tests are performed on a small blocks of glass samples.


  • 1000C furnace
  • programmable process controller
  • stainless steel sample holder and penetration rod
  • 100 stainless steel ball bearings
  • one vial of high alumina powder
  • Type "K" thermocouple
  • and instruction manual.
Specification :

Model  :  SP-3A
Warranty  :  12 Months
Cooling  :  Air assist (15 psi, 3 cfm, dry, and oil free)
Atmosphere  :  Air
Temperature Range  :  RT to 1,000C
Furnace  :  Tube style
Micro-switch travel resolution  :  0.0001
Temperature Resolution  : 1C or F
Thermocouple  :  Type K
Ball bearing size  : 1/8
Sample Size  :  5 mm square x 3 mm thick
Power Requirements  :  120vac/5amp or 240vac/2.5amp, 50/60 Hz
Power Control  :  SSR
Sampleholder  :  Stainless Steel
Penetration rod  :   Stainless Steel
Furnace Movement  :  Manual lift
Temperature Control  :  Dwyer 16010 controller with peak hold
Dimensions  :  8 x 8 x 22(20 x 20 x 56 cm)
Weight  :  11.3 lbs. (5.1kg)