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TYPE C-59

This two-component cement can be oven or room temperature cured with equally good results. Type C-59 can be used on government contracts specifying MIL-A-3920 cement and requiring a certificate of compliance.

12000

Lens Bond Type C-59,
bottle w/catalyst

4oz

13000

Additional Catalyst

3cc

13003

Thinner (Monomeric styrene)

4oz

13004

Plasticizer Modifications

.5-5%

13008-A

Refractive Index Adjuster

5gr

 

Approximate Curing Times

 

Room Temperature
22
°C (72°F)

Oven Temperature
70
°C (160°F)

Catalyst Ratio

Pre-Cure

Full-Cure

Pre-Cure

Full-Cure

2:100

24 hours

6 days

45 minutes

2 hours

3:100

18 hours

4 days

30 minutes

1.5 hours

5:100

12 hours

3 days

22 minutes

1 hour

NOTE: Sufficient catalyst is supplied with each bottle of cement. The catalyst ratio shown at the top is recommended as standard. Changes in the ratio shown will alter the curing times shown, i.e., cure rate can be accelerated slightly by increasing the catalyst.

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 C-59 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.) The catalyst bottles have a specially designed controlled-drop tip, pre- calibrated at our laboratory to an accuracy of ±1%. To use, squeeze the inverted bottle, allowing one drop to fall at a time. For 2:100 mixture, use 2 drops per 3ml. of cement. For 5:100 mixture, use 5 drops per 3ml of cement. (or 8 to 5ml or 40 to 25ml).

N.B. The catalyst bottle supplied with Type C-59 Cement contains more than sufficient catalyst for a 3:100 catalyst:cement ratio.

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 C-59: 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-(0.0474 2)-[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 @ between 27°C-100°C

                                 5.58x10-5/°C @ 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...................2.9%

Outgassing CVCM..................0.1%

Shipping and Storage.............Type C-59 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.............................(4oz) 114 gm

*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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