254mm Raw Glass Blank DIY Newtonian Reflection Telescope Primary Mirror K9 Glass

Category

Mirrors & Prisms

Store

eBay

Brand

Unbranded

For example: QF8 (light flint) BaK11 (barium crown) K9 (crown) Generally speaking, crown glass belongs to the alkali silicate system, and most flint glasses belong to the lead silicate system. The composition of K9 is as follows: SiO2-69.13% B203=10.75% Ba0=3.07% Na20=10.40% K20-6.29% As203=0.36%.

100.79 GBP