What is a Optical Technician? Optical technicians, also known as ophthalmic laboratory technicians, create eyeglasses and contact lenses as well as lenses for binoculars and other optical devices. They fill prescriptions from ophthalmologists and optometrists, ensuring that the lenses refract light at the proper angle to permit optimal vision.
Needled Silica Insulation. InsulBattÃ¤ 1800 High Temperature needled silica insulation is fabricated from high quality Silica that will not burn and will withstand continuous exposure to temperatures of 1800Â°F / 982Â°C. This material resists most acids and alkalis and is unaffected by most bleaches and solvents. It is highly flexible and conformable.
Depends on what metal and what acid. Most common metals can be attacked by some type of acid. Other more rare and exotic metal are more resistant. Gold Platinum are resistant â¦to almost all acids except for a mixture of Nitric and Hydrochloric acid (aqua regia) and in the case of platinum the mixture must be hot. Tungsten and Tantalum are also in this category.