LENS BOND TYPE M-62 is used companies cementing large quantities of optical elements. Because of its one-hour oven cure at 70°C and with its four-hour room temperature pre-cure the use of Type M-62 permits the technician to mix a quantity of cement and bond a lot of elements before the cement starts to gel. Type M-62 meets MIL-A-3920 Standards.

Curing Times

Sufficient catalyst is supplied with the bottle of cement, mixed at a 3:100 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 2:1000 4 hours 4 days 20 minutes 1 hours 3:1000 3 hours 3 days 15 minutes 45 minutes 5:1000 2 hours 2 days 10 minutes 30 minutes

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
Outgassing CVCM: 0.1 %
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).