Introduction of CR39 sunglasses lenses

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What is CR39 sunglasses lenses?The CR39 resin lens material is a thermosetting resin. The mold is opened first, and then it is manufactured by compression casting.  which was developed by the Columbia Research Institute of PPG Company in 1942, so it is called "Columbia resin". CR39 lens is one of the most used lenses.At present, most of the resin lenses  for correcting vision and sunglasses are made of CR39 resin material,CR39 sunglasses lenses are currently one of the most widely used lenses, widely used in various types of frames, especially mid-to-high-end acetate sunglasses and metal sunglasses. 

CR39 sunglasses lenses for acetate sunglasses
CR39 sunglasses lenses for acetate sunglasses

Features of CR39 sunglasses lenses. Among the most commonly used lenses of CR39, nylon, and PC, CR39 has the characteristics of good light transmittance, high hardness, not fragile, moderate weight, and rich colors. It is one of the lens types that many consumers love and is widely used. Now popular acetate sunglasses, metal sunglasses and so on.

The craftsmanship of CR39 sunglasses lenses. First open the casting mold (such as different specifications, cambers, thickness, etc.), and then cast CR39 resin material to form a CR39 white lenses (many samples of eyewear use CR39 white lenses).

Water-proof and oil-proof process. After the strengthening process, a waterproof or oil-proof lenses can be added according to customer requirements. Waterproof membrane identification method: Sprinkle some water on the lens, stand the lens up, the water will immediately harvest into drops and drip easily. The ones that are not waterproof are not easy to harvest and drip. Oil-proof lenses identification method: Use an oil-based pen to draw on the surface of the lens, the vertical color will shrink into a drop shape, and it will be removed by gently rubbing it with a cloth. It is not oil-proof, that is, it does not shrink into drops and is difficult to wipe off. According to requirements, only waterproof or oil-proof effect can be added, or both effects can be added, namely oil-proof and waterproof. According to requirements, it can also be used for general waterproof and oil-proof effects, or super-water-proof and super-oil-proof effects (that is, the oil-proof and waterproof effect is particularly good).

How to identify CR39 lenses. This is mainly for nylon and PC lenses. 1) Knife bracket method: Use a utility knife to wrap it on the side. The powdered one is CR39. Nylon and PC are filamentous. 2) Shape recognition method: CR39 lenses generally do not have a handle, and nylon and PC lenses have a handle. 3) Voice recognition method: Use your fingers to flick the surface of the lens, CR39 sounds solid and heavy, nylon is relatively brittle, and PC lenses is the most brittle.

Application of CR39 sunglasses lens. 1) Most myopia lenses now use CR39 resin lenses; 2) CR39 sunglasses lenses are also one of the most widely used lenses at the moment. They are widely used in acetate glasses, metal glasses, titanium glasses and buffalo horn frames etc. (but irregular glasses rings Not suitable, for example, the corners are more obvious; and fish-line glasses, three arrows are not suitable).


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