TC-812 REV 1 A/B Page 1 of 2 Date: 02/22/2023
For more information call BJB Enterprises, Inc. (714) 734-8450 Fax (714) 734-8929
www.bjbenterprises.com
RIGID FILLED POLYURETHANES
By BJB Enterprises. Inc.
An ISO-9001 Certified company
TC-812 REV 1 A/B
LIGHTCAST
TC-812 REV 1 A/B Lightcast is a lightweight, rigid, quick setting, low shrinkage, low viscosity filled cast urethane that weighs
30-40% less than most conventional unfilled urethane systems. Parts made from TC-812 REV 1 can float in the water and its fast-
curing properties allow parts to be demolded in 1 hour or less. TC-812 REV 1 is ideal for carving, sanding, drilling, machining,
and modifying parts due to its low-density filler content. This product is perfect for fast patterns, mold cores, vacuum forming
bucks, temporary molds, lightweight models, fishing lures, and much more.
RoHS/REACH Compliant Mercury and Phthalate Free Easy to Paint or Pigment
Low Density/Lightweight Fast Processing Economical
Low Shrinkage Easy to Machine/Sand/Carve Floats/Buoyant
PHYSICAL PROPERTIES TEST METHOD RESULTS
Hardness, Shore D ASTM D2240 60 5
Density (g/cc) ASTM D792 0.70
Cubic Inches per Pound N/A 39.62
Color/Appearance Visual Opaque Cream
Tensile Strength (psi) ASTM D638 2,600
Flexural Modulus (psi) ASTM D790 2.1 x 10
5
Shrinkage (in/in) linear 12 x1/2 x1/2 0.003
Heat Deflection Temperature @ 66psi ASTM D648 140 F (60 C)
Note: Reported physical properties ae based on test specimens cured at room temperature (77 F) for 7 days.
HANDLING PROPERTIES Part A Part B
Mix Ratio by weight 100 90
Mix Ratio by volume 100 100
Color Amber White
Viscosity (cps) @ 77 F (25 C) Brookfield 350 340
Mixed Viscosity (cps) @ 77 F (25 C) Brookfield 375
Work Time, 0.5 lb. mass @ 77 F (25 C) 4 5 minutes
Gel Time 8 10 minutes
Demold Time @ 77 F (25 C) 1 Hour
Properties above are typical and not for specifications.
MIXING INTRUCTIONS:
Both sides of TC-812 REV 1 A/B must be pre-mixed before each use. We recommend using a Jiffy Mixer to resuspend the
fillers, then combine Parts A and B by weight. Mix thoroughly in a polyethylene pail scraping the sides and bottom, de-air the
mixture and pour within two minutes. For best results, be sure that TC-812 REV 1 A/B and molds are at room temperature.
TC-812 REV 1 A/B Page 2 of 2 Date: 02/22/2023
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.”
ACCESSORIES:
BJB offers silicone RTV mold making materials along with a wide range of accessory items. These include de-airing agents,
pigments, mold releases, and Jiffy
Mixers. Visit BJB s website at www.bjbenterprises.com or consult a BJB representative for
more information.
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
Gallon Kits 6.2 lbs. 5.6 lbs.
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.
Handling Guide