Surface stress meter GASP

The GASP®, or Grazing Angle Surface Polarimeter, is an optical instrument designed to measure SURFACE
STRESS in glass products. The procedure is nondestructive, accurate and simple, suitable for in-plant or field
testing of actual glass products.

GASP uses :
Tempered Glass:
◆ to control tempering level and get feedback for tempering furnace adjustment.
◆ to avoid over-tempering and thus increase capacity and reduce spontaneous breakage risk.
◆  Factory Production Control according to EN 12150-2, after necessary correlation tables between surface
stress and mechanical strength has been established.

Heat Strengthened glass:
◆ to control surface stress level and get feed back for furnace control.
◆  Factory Production Control according to EN 1863-2, after necessary correlation tables between surface
stress and mechanical strength has been established.
◆ Production Control per ASTM C 1279 in conformance with ASTM C 1048.

Annealed glass, windscreens, TV glass:
◆ to measure residual stress after annealing.
◆ to control required compressive surface stress on windscreen at areas were average stress is tensile.
The GASP is designed to measure on the “tin side” of float glass. We also provide a selection of UV lamps
which are useful for identifying the tin side.

Model options and accessories

Depending on the usage described before there are 2 basic models, that both come with several options to
accommodate every need :
 
  • Standard GASP for fl at surfaces, or for slightly curved surfaces
  • GASP-CS for curved and flat surfaces
These two versions can be equipped with a fi ber-optic or laser light source. 

Both versions come with a standard sensitivity quartz measuring wedge. For low stress products, such as annealed glass, windshields or TV panels, there is a high sensitivity wedge which doubles the measurement resolution. Both wedge types are interchangeable and may be used with the same instrument.

Both GASP models can be equipped with a video head and connected to a black/white monitor. Video-GASP is available separately or as an upgrade to a regular GASP.

The video GASP and laser GASP with video option, can also be used with our automatic stress mesurement
software AMAYA.
 
All GASP instruments are supplied as complete kits, equipped as follows :
 
  •  INSTRUMENT OPTICAL ASSEMBLY
  •  STANDARD «QUARTZ» MEASUREMENT WEDGE
  •  INDEX FLUID ( 30 cc )
  •  CARRYING CASE
  •  AC POWER SUPPLY/RECHARGER
  •  BATTERY PACK ( Laser model only )
  •  MANUAL WITH CALIBRATION CHART
DOWNLOAD LEAFLET ABOUT THIS PRODUCT (PDF)