TC-5045 A/B Page 1 of 2 Date: 09/08/2022
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TC-5045 A/B
45 SHORE A
ROOM TEMPERATURE CURING SILICONE
TC-5045 A/B is a room temperature, addition/platinum curing silicone rubber designed for mold making, encapsulation
applications, pressure pads, gaskets, and various types of parts. It is an excellent mold material for casting rigid and flexible
urethane systems. It may also be used as a mold making material for casting low melting metals in continuous operations to
650 F (344 C) and sporadic applications of 850 F (454 C). TC-5045 A/B has proven to be less inhibited in its cure than
standard platinum based silicones. It has a very favorable CTE for heat expandable mandrels used in composite tooling.
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore A ASTM D2240 45 5
Density (g/cc) ASTM D792 1.33
Cubic Inches per Pound N/A 20.5
Color/Appearance Visual Pink/Opaque
Tensile Strength (psi) ASTM D412 756
Elongation (%) ASTM D412 400
Tear Strength (pli) ASTM D624 Die B 96
Shrinkage (in/in) linear ASTM D2566 @ 1 depth Nil
Coefficient of Thermal Expansion (in/in/ F) ASTM831 14.64 x 10
-5
Dielectric Constant, 100 Hz ASTM D150 3.187
Dissipation Factor, 100 Hz ASTM D150 0.0054
Dielectric Constant, 100 kHz ASTM D150 3.139
Dissipation Factor, 100 kHz ASTM D150 0.0014
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 10
Mix Ratio by volume 100 13
Specific Gravity @ 77 F (25 C) 1.38 1.03
Color Tan Red Oxide
Viscosity (cps) @ 77 F (25 C) Brookfield 56,900 900
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 25,500
Work Time, 100g mass @ 77 F (25 C) 45 minutes
Gel Time 60 minutes
Demold Time @ 77 F (25 C) 16 24 hours
Demold Time @ 150 F (65.6 C) 2 4 hours
SILICONE CASTING RUBBERS
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An ISO-9001 Certified company
TC-5045 A/B Page 2 of 2 Date: 09/08/2022
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
NON-WARRANTY “Except for a warranty that materials substantially comply with the data presented in Manufacturer’s latest bulletin describing the product (the basis for this substantial
compliance is to be determined by the standard quality control tests generally performed by Manufacturer), all materials are sold “AS IS” and without any warranty express or implied as
to merchantability, fitness for a particular purpose, patent, trademark or copyright infringement, or as to any other matter. In no event shall Manufacturer’s liability for damages exceed
Manufacturer’s sale price of the particular quantity with respect to which damages are claimed.”
INHIBITION:
Although TC-5045 A/B has proven to be less inhibited in curing against most substrates some materials may cause inhibition or
neutralization of the curing agent. Inhibition may easily be determined by brushing a small quantity of TC-5045 A/B over a
localized area of the surface to be reproduced. If the TC-5045 A/B is gummy or uncured after the curing time, then you know
the mold surface is acting as an inhibitor. Molds made from wood, plaster, metal or plastic should not cause inhibition if they are
clean. To insure against possible problems, it is advisable to spray a RF barrier film (BJB product RF-5215) over any
questionable surfaces. This is the best way of treating clays and surfaces that cause inhibition.
STORAGE:
Store ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 12 months from date of
shipment when properly stored at recommended temperatures. Purge opened containers with dry nitrogen before re-sealing.
PACKAGING Part A Part B
Cubic Inches
per Kit
Quart Kits 2 lbs. 3.2 oz. 46
Gallon Kits 8 lbs. 13 oz. 182
5-Gallon Kits 40 lbs. 4 lbs. 902
55-Gallon Drum Kits 450 lbs. 45 lbs. 10,148
SAFETY PRECAUTIONS:
Use in a well-ventilated area. Avoid contact with skin using protective gloves and protective clothing. Repeated or prolonged
contact on the skin may cause an allergic reaction.
Eye protection is extremely important. Always use approved safety glasses or goggles when handling this product.
IF CONTACT OCCURS:
Skin: Immediately wash with soap and water. Remove contaminated clothing and launder before reuse. It is not
recommended to remove resin from skin with solvents. Solvent only increase contact and dry skin. Seek
qualified medical attention if allergic reactions occur.
Eyes: Immediately flush with water for at least 15 minutes. Call a physician.
Ingestion: If swallowed, call a physician immediately. Remove stomach contents by gastric suction or induce vomiting only
as directed by medical personnel. Never give anything by mouth to an unconscious person.
Refer to the Material Safety Data Sheet before using this product.
Silicone Handling Guide