POLY IR® 1 POLY IR® 2 POLY IR® 3 POLY IR® 4 POLY IR® 5 POLY IR® 6 POLY IR® 7
Index of Refraction
visible (sodium D line) 1.52 1.53 1.50 1.53 1.425 1.49 at 1 µm 1.53
8-14 µm 1.53 1.54 - 1.54 - - 1.54
beyond 15 µm 1.48 1.48 1.50 1.48 - - 1.48
Tensile modulus (103 PSI) 14-38 60-180 165-225 60-180 150-300 350-450 60-180
Flexural modulus (103 PSI) 8-60 100-260 170-250 100-260 170-250 390-470 100-260
Hardness D40-50 (Shore) D60-70 (Shore) R85-110 (Rockwell) D60-70 (Shore) R80 (Rockwell) M80-100 (Rockwell) D60-70 (Shore)
Thermal expansion (10-5/°C) 10-20 11-13 6-10 11-13 4.5-7 5-9 11-13
Service Temperature, °C 65 100 120 100 70* 80 100
Effect of sunlight crazes rapidly none crazes rapidly slight none none crazes rapidly
Effect of weak acids little very little none very little none none very little
Effect of strong acids attacked by oxidizing acids attacked by oxidizing acids attacked slowly by oxidizing acids attacked by oxidizing acids none attacked by conc. oxidizing acids attacked by oxidizing acids
Effect of weak alkalies little very little none very little none none very little
Effect of strong alkalies little very little very little very little none attacked very little
Effect of organic solvents little little below 60°C little below 80°C little below 60°C slight sol. in ketones, esters, and some hydrocarbons little below 60°C
Physical Properties of POLY IR® Materials
*POLY IR® 5 material becomes flexurally weak above 70°C, i.e., its heat deflection temperature is very low even for the small stresses normally encountered in mounted lenses. Unless you take special precautions to avoid such stresses, we do not recommend that POLY IR® 5 material be use above 70°C even though its other properties, both physical and optical, are good to 135°C. POLY IR® 5 material is a vey frustrating material: one with good high-temperature properties which cannot be used at high temperatures.