LENS BOND TYPE RD-3-74 is a modification of Type F-65 containing a plasticizer. As most optical cements contract upon curing, they can occasionally set up stresses in thin elements. This stress could either cause bond breakage or lens distortion. Type RD 3-74 solves this problem by remaining slightly elastic after curing.

Curing Times

Sufficient catalyst is supplied with the bottle of cement, mixed at a 1:100 ratio or more. Changes of the ratio will alter the curing times, i.e. cure rate can be accelerated by increasing the catalyst.

Room Temperature 22°C
Oven Temperature 70°C
Catalyst Ratio Pre-Cure Full-Cure Pre-Cure Full-Cure
1:1000 2 hours 36 hours Not recommended!
3:1000 45 minutes 30 hours Not recommended!
5:1000 30 minutes 1 day Not recommended!

Technical Data

Viscosity: 275 cps to 320 cps
Refractive Index: 1,55 at 25°C (full cured) resp. 1,53 (uncured)
Operational Temperature Range: -54°C (-65°F) to +100°C (+212°F)
Shear Strength: 5,200 lb/inch2
Dielectric Contrast: 3 at 106 cps
Water Absorption: 0,3% (24 hours, 25°C)
Shrinking in Cure: approx. 4%
pH: 3,2
Specific Gravity: 1,22
Shore D Hardness: approx. 90
Thermal Conductivity: 500 x 10–6 cal (sec) (cm2) (°C) (cm)
Flash Point (uncured): 50°C
Shipping and Storage: No special handling; should be kept from intense light and elevated temperatures.

Shelf Life: 18 months from date of manufacture

Packing Size: 114 g (4 oz).