![]() Soda Lime glass has a thermal co-efficient expansion of 93 (10-7) which is approximately 10 ppm (parts per million), and a transmittance value of 88% at 375-750nm, with a glass flatness class of 5um It transmits a very wide variety of light sources from 350nm upwards, with an excellent UV transparency. The glass is optically good, very flat and has no imperfections. Soda Lime Glass is the most common substrate used for targets, due to its good quality/price ratio. Clearance at centre is 0.30mm, giving a minimum spoke width of 0.002mm at the centre ![]() SL1-4 314 Spoke design, where l= D / 100 for simpler calculations.Clearance at centre is 0.25mm, giving a minimum spoke width of 0.003mm at the centre SL1-3 120 Spoke design, giving 3 deg rotation.Clearance at centre is 0.20mm, giving a minimum spoke width of 0.004mm at the centre ![]()
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