Term
| What type of material is CR39? |
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Definition
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Term
| What type of material is polycarbonate? |
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Definition
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Term
| What type of material is Trivex? |
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Definition
| quasi thermosetting/thermoplastic |
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Term
| What type of ultraviolet light is 100% blocked by Trivex? |
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Definition
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Term
| What size ball is used for ANSI Z80.1, dress eyeware? |
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Definition
| 0.56 ounce steel ball dropped from 50" |
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Term
| What size ball is used for basic impact and high impact? |
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Definition
| 2.4 ounce and 17.6 ounce balls |
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Term
| What size ball does Trivex withstand when dropped at 50"? |
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Definition
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Term
| What is the tensile strength of Trivex? Plastic? |
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Definition
| 130-180 lbs, Plastic tensile strength is only 30 lbs. |
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Term
| What type of lenses are made by extrusion compression molding? |
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Definition
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Term
| What is the advantage of extrusion compression molding versus injection compression molding? |
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Definition
| Extrusion compression molding has no material stress, whereas injection compression molding is 150 tons/square inch. |
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Term
| What does it mean that Resolution lenses are birerefringence free? |
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Definition
| There is no manufacturing induced stress distortion. |
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Term
| How much 398 nm UV light does resolution material absorb? |
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Definition
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Term
| Can you tint reolution material? |
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Definition
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Term
| Is reolution produced in plus powers? |
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Definition
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Term
| Is the front of a resolution lens aspheric or atoric? What about the back? |
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Definition
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Term
| What type of material is Clear 16 and Thin and Dark? How small can you surface their center thickness and still pass the drop ball test? |
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Definition
1) New glass lense types
2) 1.5 mm |
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Term
| What type of lens is NXT in referring to how its made? |
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Definition
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Term
| What two type of lenses are ideal for drill mounts? |
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Definition
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Term
| Name one advantage of Polycarbonate over NXT? |
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Definition
| Polycarbonate has a slightly higher index of refraction. NXT has a lower specific gravity, higher Abbe number, and is more chemically resistant. |
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