Optician Salary in Canada. The Canadian government classifies an optician under the group 31: professional occupations in health (3231). According to their statistics, the average annual income for someone working in the profession falls around $39,000 with approximately 16% of opticians earning over $50,000 per year.
So it needs to be tough. Low-cost bench vises often use steel, which is light and cheap. It's fine for light duties and for hobbyists, but it doesn't have the high resilience a professional would need. The best bench vises are made of cast iron, and two variants can be found: gray iron and ductile iron. Gray iron isn't about color, it's used to indicate the presence of graphite flakes. It's the most common form of cast iron, used in everything from vises to stove tops.
Not to be confused with viscous. Viscose is both a semi-synthetic fiber, formerly called viscose rayon, or rayon and a solution of cellulose xanthate. The latter is produced by treating dissolving pulp with aqueous sodium hydroxide and carbon disulfide which is used to spin the viscose rayon fiber.