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 :
◆ 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.