Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
polymer
plastic material |
| gptkbp:brand |
gptkb:CR-39
|
| gptkbp:category |
thermosetting plastic
|
| gptkbp:chemicalClass |
gptkb:allyl_diglycol_carbonate
|
| gptkbp:density |
1.32 g/cm³
|
| gptkbp:developedBy |
gptkb:PPG_Industries
|
| gptkbp:hasProperty |
lightweight
impact resistance UV resistance high optical clarity |
| https://www.w3.org/2000/01/rdf-schema#label |
PPG CR-39
|
| gptkbp:introducedIn |
1940s
|
| gptkbp:marketedAs |
gptkb:PPG_Industries
|
| gptkbp:notableFor |
first plastic used for ophthalmic lenses
|
| gptkbp:refractiveIndex |
1.498
|
| gptkbp:usedFor |
optical lenses
eyeglass lenses |
| gptkbp:usedIn |
sunglasses
optical instruments safety goggles |
| gptkbp:bfsParent |
gptkb:PPG
|
| gptkbp:bfsLayer |
6
|