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	$30.00
13000	Additional Catalyst	3cc	$3.00
13003	Thinner (Monomeric styrene)	4oz	$6.00
13004	Plasticizer Modifications	.5-5%	$2.00
13008-A	Refractive Index Adjuster	5gr	$20.00

Approximate Curing Times

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-(0.04742)-[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 @ 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.

TYPE M-62

Because of its 1 hour oven cure at 70°C, Type M-62 is used by companies cementing large quantities of optical elements, and with its 4 hour room temperature pre-cure, the use of Type M-62 permits the technician to mix a quantity of cement and bond many elements before the cement starts to gel. This cement is qualified to meet MIL-A-3920.

12100	Lens Bond Type M-62 bottle w/catalyst	4oz	$30.00
13000	Additional Catalyst	3cc	$3.00
13003	Thinner (Monomeric styrene)	4oz	$6.00
13004	Plasticizer Modifications	.5-5%	$2.00
13008-A	*Refractive Index Adjuster	5gr	$20.00

Approximate Curing Times

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 M-62 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 M-62 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 M-62: 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°(-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/°@ 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...................2.5% 
Outgassing CVCM..................0.1% 
Shipping and Storage.............Type M-62 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.

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	$30.00
13000	Additional Catalyst	3cc	$3.00
13003	Thinner (Monomeric styrene)	4oz	$6.00
13004	Plasticizer Modifications	.5-5%	$2.00
13008-A	*Refractive Index Adjuster	5gr	$20.00

Approximate Curing Times

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.

TYPE RD3-74

Type RD3-74 is a modification of Type F-65 containing a plasticizer. Because 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 RD3-74 solves this problem by remaining slightly elastic after curing.

12300	Lens Bond Type RD3-74, bottle w/catalyst	4oz	$30.00
13000	Additional Catalyst	3cc	$3.00
13003	Thinner (Monomeric styrene)	4oz	$6.00
13004	Plasticizer Modifications	.5-5%	$2.00

Approximate Curing Times

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 RD3-74 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. (NOTE: Only the amount of cement that can be used within pre-cure time should be prepared.) 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 RD3-74 Cement contains more than sufficient catalyst for a 5:100 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 RD3-74: 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°(-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/°C at 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 
Shipping and Storage.............Type RD3-74 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)

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.

TYPE DC-90

A Hybrid Two-Component UV Sensitive Cement

Summers Optical has developed a hybrid two component ultraviolet sensitive cement that offers offers optical companies some of the benefits of ultraviolet pre-curing while assuring the complete cures, low strain and excellent thermal and chemical resistance of two component optical cements. 

Lens Bond Type DC-90 permits the user to pre-cure the elements in approximately 12 minutes using a low wattage black light and then full cure at room temperature without any additional UV exposure in 48 to 72 hours. The low viscosity, high flow and wetting abilities of Type DC-90 eliminate the problem of working out entrapped air between large lens and optical filters. The longer room temperature full cure permits a very strong mechanical as well as chemical bond to the substrates while the short pre-cure reduces the need for an excessive number of holding devices.

Pre-Cure and full-cure times are dependent on the UV transmission of the element being bonded.

12301	Lens Bond Type DC-90, bottle w/catalyst	4oz	$33.00
13000	Additional Catalyst	3cc	$3.00
13003	Thinner (Monomeric styrene)	4oz	$6.00
13004	Plasticizer Modifications	.5-5%	$2.00

Approximate Curing Times

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 DC-90 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 3:100 mixture, use 3 drops per 3ml. of cement.

N.B. The catalyst bottle supplied with Type DC-90 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 DC-90: 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-curing with an ultraviolet light, 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 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, UV transmission of elements, distance of lamp and power of light source 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°(-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) 
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/°C at 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 
Shipping and Storage.............Type DC-90 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)

*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.

TYPE DB-99

Lens Bond (Deblocking Cement), Type DB-99 is a solvent-free, rapid, ultraviolet light curable, temporary adhesive for precision optics. The product can be cured quickly at room temperature under UV light.

Lens Bond Type DB-99 will provide structural integrity during grinding and polishing operations. It can be debonded easily by soaking in a heated, aqueous deblocking solution. It can also be debonded by submerging in acetone for a few hours.

12303

Lens Bond Type DB-99, bottle w/catalyst

1oz

$38.00

Approximate Curing Times

Instructions For Use

1. Preparations of Elements: Other than normal optical cleaning procedures, no special preparation is required. The best final cleaner is reagent grade or chemically pure acetone.

2. Application and Curing of Lens Bond Cold Blocking Adhesive: Squeeze a few drops of the cold blocking adhesive from the convenient dispenser bottle onto the surface of the element to be bonded. Spherical and piano surfaces require grooved or slotted tooling to allow access of the deblocking solution into the interface (Piano surfaces can be debonded by submerging elements in acetone for approximately 2 hours). The user should always check with the glass or plastic manufacturer for the transmission characteristics at 365 nm of the materials they wish to bond. Less than 85% transmission at this wavelength will lengthen the cure time. The cement should be cured in 90 seconds under UV light, but the cure time may vary depending on the power of the light source and the type of element.

(High intensity UV light sources will cure the adhesive faster, however they are not recommended for use with small lenses. The effect of the heat given off by the light source may cause lens distortion).

3. Deblocking of the Elements: The removal of lenses is accomplished by soaking the elements in a heated solution of detergent and water. Deblocking is a function of bond area and temperature. After soaking, the deblocking cement should leave no residue. Atypical deblocking time is 7-15 minutes using a solution heated to 85ºC (190ºF). Deblocking time is based on a 0.5 in2 bond area. (Extremely high bath temperature can cause glass to crack.)

Safety: Although Lens Bond deblocking cement is very safe to use, some people may be sensitive to the chemicals comprising the formulation. For them, the use of finger cots or gloves is recommended. Adequate ventilation should always be provided.

Specifications

Viscosity...................................420 cps. 
Refractive Index (full-cured)...............1.54 
Refractive Index (uncured)..................1.52 
Modulus.....................................6.4 (925)
pH..........................................6.25 
Specific Gravity............................1.15 
Shore A-2 Hardness..........................60 
Elongation..................................50%
Tensile Strength {ASTM D882, N/mm2 (psi)]...3.3(475)
Shipping and Storage........................Type DB-99 needs no special handling or 
                                            storage. It should, however, be kept away  
                                            from intense light and elevated temperatures. 
Shelf Life..................................12 months at room temperature
Size........................................30 gm (1 oz)

Summers Optical

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A Division of EMS Acquisition Corp.
1560 Industry Road, P.O. Box 380, Hatfield, PA 19440
Tel: 215-412-8380; Fax: 215-412-8450 or 215-412-8451
E-Mail: sgkcck@aol.com