TC-808 A/B Page 1 of 2 Date: 11/05/2020
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-808 A/B
78 SHORE D URETHANE
CASTING SYSTEM
TC-808 A/B is a low viscosity, rapid setting, and rigid urethane compound. This system will cure quickly to a hard, tough
casting. TC-808 A/B is generally insensitive to moisture during and after cure and will readily bond to itself if stage pours are
required. TC-808 A/B is recommended in applications where a “thermoplastic feel” is desired.
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240 78 2
Density (g/cc) ASTM D792 1.08
Cubic Inches per Pound N/A 25.7
Color/Appearance Visual White/Opaque
Tensile Strength (psi) ASTM D638 6,000
Tensile Modulus (psi) ASTM D638 190,000
Elongation (%) ASTM D638 7
Flexural Strength (psi) ASTM D790 6,225
Flexural Modulus (psi) ASTM D790 170,000
Shrinkage (in/in) linear 12 x1/2 x1/2 0.004
Izod Impact, notched (ft-lb/in) ASTM D256 0.52
Heat Deflection Temperature, 66 psi ASTM D648-04 170 F (76.7 C)
Dielectric Constant, 1 MHz ASTM D150 3.447
Dissipation Factor, 1 MHz ASTM D150 0.0176
Ball Pressure Test (mm) 167 F (75 C) IEC 60695-10-2 1.7
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 100
Mix Ratio by volume 90 100
Specific Gravity @ 77 F (25 C) 1.14 1.02
Color Pale Yellow White
Viscosity (cps) @ 77 F (25 C) Brookfield 90 300
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 200
Work Time, 100g mass @ 77 F (25 C) 2 2.25 minutes
Demold Time @ 77 F (25 C) 10 20 minutes (see Note 1)
Properties above are typical and not for specifications.
TC-808 A/B Page 2 of 2 Date: 11/05/2020
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.”
CURE SCHEDULE/HEAT CU RING:
Most of the physical properties can be achieved in 5-7 days at 77 F (25 C). You may use your own post-cure schedule but the
physical properties may vary from BJB s cure schedule of 1-3 hours at 77 F (25 C) followed by 16 hours at 180 F (82 C). Do
not exceed curing temperatures of 200 F (93 C). Support of the part may be required to prevent part deformation during the
heat curing process.
NOTE 1:
TC-808 A/B generally cures to a demoldable state in about 10-20 minutes; however, thin sections or certain part configurations
may require more in-mold cure time. TC-808 A/B gains increasing toughness early in the cure cycle and thick sections, (3/8″
or greater), may be demolded much sooner. Sections that are less than a 1/8″ may require an hour or more before demold.
NOTE 2:
The “B” side should be remixed before each use until uniform in appearance. Opened containers of material should be purged
with dry nitrogen prior to replacing lids or caps to prevent moisture contamination from humid air.
STORAGE:
Store at ambient temperatures, 65-80 F (18-27 C). Unopened containers will have a shelf life of 6 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. 2 lbs. 103
Gallon Kits 8 lbs. 8 lbs. 411.2
5-Gallon Kits 40 lbs. 40 lbs. 2,056
55-Gallon Drum Kits 400 lbs. 400 lbs. 20,560
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. Solvents 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.
WARNING: This product can expose you to chemicals including Mercury compounds, which are known to the State of
California to cause cancer and birth defects or other reproductive harm. For more information, go to
www.P65Warnings.ca.gov.
Handling Guide