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Model SP-3A


     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.


  • 1000°C 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

  • Instruction manual.



Model: SP-3A

Warranty: 12 Months

Cooling: Air assist (15 psi, 3 cfm, dry, and oil free)

Atmosphere: Air

Temperature Range: RT to 1,000°C

Furnace: Tube style

Micro-switch travel resolution: 0.0001

Temperature Resolution: 1°C 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 controller with peak hold

Dimensions: 8 x 8 x 22 (20 x 20 x 56 cm)

Weight: 11.3 lbs. (5.1kg)

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