Magikmold^® U-740 Urethane Rubber

Magikmold^® U-740 is a room-temperature curing (RTV), two-part, liquid urethane rubber designed for the manufacture of flexible molds and parts. This rubber has a Shore A40 hardness, 20-minute pour time, and 16-hour demold time.

Magikmold U-740 is a pourable rubber, but can be thickened with Fumed Silica to make brush-on molds.

 

Common Applications & Casting Materials

Magikmold U-740 molds are often used in:

• Concrete Casting for home decor, sculpture, and more
• Gypsum Plaster Casting for artistic and restoration projects
• Wax Casting for sculpture reproduction and candle-making applications
• Resin Casting for sculpture reproduction, prototyping, and much more

 

Magikmold U-740 rubber can also be used to make finished parts, including:

• Prototypes parts
• Industrial parts like gaskets and bushings

 

Release agent is generally not necessary for casting plaster and some waxes in U-700 Series molds. For resin casting (e.g., Magikast® Fast Cast Resins), first spray the mold with a suitable release agent (e.g., Stoner E-236 Urethane Mold Release) and brush with a dry brush to ensure thorough coverage. For concrete casting, use a suitable form release – avoid solvent-containing release agents as they can cause the mold to shrink or swell.

 

Physical Properties

Type	Polyurethane
Mix Ratio by Weight	1 Part A : 1 Part B
Shore Hardness	A40
Pour Time	20 min.
Demold Time @ 77°F	16 hr.
Cured Color	Amber
Mixed Viscosity	2,500 cP
Specific Volume	27.5 in³/lb
Specific Gravity	1.01
Tensile Strength	330 psi
Elongation	1,000 %
Die C Tear Strength	75 pli

 

WARNING: This product can expose you to chemicals including Toluene diisocyanate (TDI), which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.

 

Product Literature

Technical Data Sheet: Magikmold^® U-700 Series Technical Data Sheet

Safety Data Sheets: Magikmold^® U-740 Urethane Rubber Part A | Magikmold^® U-740 Urethane Rubber Part B