As the weather warms up and the temperature rises, the sun begins to be active in front of us again, and sunglasses return to our sight. Do you know the advantages and disadvantages of various types of sunglasses?
1、 Glass sunglasses lenses
Glass lenses were previously a commonly used material for sunglasses, but due to their heavy weight, fragility, and high production costs, their use gradually decreased. But glass is scratch resistant. If the lens is made of hardened glass or crystal, there will be no scratch marks without encountering diamonds and granite.
2、 Resin material sunglasses lenses
Friends who often wear glasses must have heard of resin lenses, but what exactly is resin lenses? Resin (CR-39) is actually a chemical substance with a phenolic structure, extracted from phenolic components in petroleum. Its characteristics are light weight, high temperature resistance, strong impact resistance, and effective UV blocking. The major advantage of using resin lenses on sunglasses is their easy coloring performance. Many fashionable sunglasses utilize the coloring properties of resin lenses, but resin lenses have poor toughness and are not resistant to impact.
3、 Nylon material sunglasses lenses
Nylon sunglasses are commonly used in sports brand sunglasses and high-quality brand sunglasses. They have high elasticity, excellent optical quality, and extremely strong impact resistance. When nylon lenses were invented, they were used as eye protection lenses and have professional protective functions. The disadvantage is that nylon lenses have poor wear resistance and high production costs.
4、 PC material sunglasses lenses
PC refers to polycarbonate, a type of plastic (abbreviated as PC), which is a polymer with carbonate groups in its molecular chain. PC material lenses, in simple terms, are sunglasses made of plastic material. This material can also be classified into high and low end, including PC lenses commonly used by professional athletes and colored or colorless plastic sheets that cost a few cents per set. Its characteristics are lightweight and good coloring performance, but its disadvantages are low wear resistance and unstable optical performance.
5、 TAC material sunglasses lenses
TAC sunglasses lenses are widely used in China. TAC (cellulose triacetate), Triacetyl Cellulose）， Its composition is very complex and it is one of the high penetration polymer materials. TAC, as a type of sunglasses, has the characteristics of acid and alkali resistance, light and thin texture, and high cost-effectiveness. However, its poor wear resistance has become the weakness of TAC lenses. Its unstable optical characteristics are also the reason why although TAC lenses are cheap, they are ultimately abandoned by the vast majority of brands.
Do you prefer low-cost TAC lenses or resin lenses with convenient coloring and good UV resistance for these five different materials of sunglasses?
