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TYPE F-65

Type F-65 was developed mainly for its rapid, room temperature cure. With F-65, the engineer or researcher can test his systems in a few hours. Type F-65 also saves time in pilot and small production runs, or where curing ovens are not available. This cement is qualified to meet MIL-A-3920.

12200
Lens Bond Type F-65
bottle w/catalyst
4oz
 

13000 
Additional Catalyst
  3cc
 
13003
Thinner (Monomeric styrene)
4oz
 
13004
Plasticizer Modifications
.5-5%
 
13008-A
*Refractive Index Adjuster

Approximate Curing Times

Room Temperature
22°(72°F)
Oven Temperature
70°(160°F)
Catalyst Ratio Pre-Cure Full-Cure Pre-Cure Full-Cure
2:100 60 minutes 36 hours Not Recommended
5:100 30 minutes 1 day Not Recommended
NOTE: Although we do not recommend complete oven curing, elements that have been pre-cured at room temperature for 30 minutes can then be placed in the oven to achieve a full cure in a half hour. 
The catalyst ratio shown is recommended as standard. Sufficient catalyst is supplied with each quantity.

Instructions For Use

1. Preparation of Elements: Other than normal cleaning procedures, no special preparation is required. The best final cleaner is reagent grade or C.P. acetone.

2. Preparation of Cement: Prepare Type F-65 by the addition of catalyst to cement in a clear glass container. Thorough mixing is important. While stirring, hold container up to the light and observe the Schlieren Effect. When the Schlieren Effect disappears, continue mixing for at least 30 seconds. The entrapped air in the cement will surface if the mixture rests at room temperature for a short time, or is briefly subjected to a vacuum of 625mm Hg. (25" Hg.) Sufficient catalyst is supplied with Type F-65 cement for a 5:100 ratio (5 drops per 3ml of cement). 

Safety: Although LENS BOND is quite safe to use, some persons may be sensitive to the chemicals comprising the formulation. For them, the use of finger cots or gloves is recommended. Adequate ventilation should be provided. 

3. Application and Curing of Type F-65: Place the prepared LENS BOND on the concave surface, and place the convex surface thereon. Press down firmly and gently until LENS BOND completely wets the matching surfaces. Then, with a slow rotary motion and light pressure, force air bubbles from between the lenses. Excess Cement can be removed with a cloth slightly moistened with alcohol or acetone. (Excess solvent will remove cement from between the cemented components.) After pre-cure, holding devices can be removed and the components carefully cleaned. Before environmental testing, however, the lenses must be fully cured. 
Full-cure time is in addition to the pre-cure time. If there is no reason to remove holding devices after pre-cure, components should be cured for the total time (pre-cure plus full-cure). If there is any doubt about cure being achieved, allow components to cure for a longer period of time. The Cement will not overcure. If cure is not achieved in a reasonable amount of time, the catalyst ratio, mixing procedure, and temperature should be checked. 

Note: If the elements will undergo hostile environmental tests, allow 48 to 72 hours between full-cure and testing.

Specifications

Viscosity........................275 cps. to 320 cps. 
Refractive Index (full-cured)....1.55 at 25°C 
Refractive Index (uncured).......1.53 
Operational Temperature Range....-54°C(-65°F) to 100°C(212°F) 
Youngs Modulus...................6.2 x 105lbs/in2 
Shear Strength...................5200 lbs/in2 
Impact...........................(.3 to .4)ft lb/in 
Specific Heat....................(.2 to .4) Cal/gm 
Dielectric Constant..............3 at 106 cps 
Loss Factor at 106 cps...........(.05) 
Water Absorption.................0.3% (24 hours. 25°C on bulk material) 
Dispersion Formula...............n=1.5754-(0.04742)-[0.0070/(2-0.028)]+
[
0.0011/(2-0.028)2] Shrinkage on Cure................Approximately 4% pH...............................3.2 Specific Gravity.................1.22 Shore D. Hardness................Approximately 90 Surface Tension..................44 Dynes/cm. Linear Coefficient of Expansion..Approximately 6.3x10-5/°C at between 27°C-100°C 5.58x10-5/°@ between 100°C-200°C Thermal Conductivity.............500x10-6 cal(sec)(sq.cm)(°C)(cm) Flash Point (uncured)............50°C Glass Transition (Tg)............>90°C Outgassing TML...................2.6% Outgassing CVCM..................0.1% Shipping and Storage.............Type F-65 needs no special handling or storage. It should, however, be kept away from intense light and elevated temperatures. Shelf Life.......................18 months from date of manufacture Size.............................114 gm(4oz)
*The reference index may be increased to 1.59-1.61 with the use of our Cat# 13008,
 - Refractive Index Adjuster
For technical data on adhesion properties, solvent and thermal resistance as well as 
transmission studies, please go to our technical data section on this site.

 


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