Density Modified High Gravity Compounds

  • Balance density, durability, and cost with custom formulations
  • Achieve optimum processability, even in complex geometries, with tailored viscosity
  • Brand products with molded-in custom matched color

Density-modified high gravity compoundsDensity-modified high gravity compounds from RTP Company combine the benefits of plastics with the desirable features of metals, namely heft. Our custom material development expertise allows RTP Company to formulate high gravity compounds that meet your requirements for mass and performance while keeping your application feasible from a production and cost perspective. High additive loadings can increase material viscosity. We always strive to maintain processability by keeping viscosity in check, because material flow and ability to fill intricate designs is as important as getting the precise density you need. You can choose the exact density necessary up to 11 g/cm3 to make your design perform exactly as you imagined it. Whether you need to adjust the center of gravity, dampen sound, or change consumers perceptions — high gravity compounds are the solution you’re looking for. Simpler, quicker, and less costly to work with than machining metals, plastics are also corrosion resistant in aqueous environments and correct polymer selection can provide resistance to the many different chemicals your application maybe exposed to during its lifecycle. While formulating your custom compound, RTP Company’s engineers can often add molded-in, custom color to allow easy identification of your product without expensive secondary painting processes.  

Additional Benefits

  • Tune density to desired level up to 11 g/cm3
  • Control center of gravity by adjusting mass
  • Increase perceived value by adding heft
  • Dampen sound and vibration by increasing density
  • Use injection molding to obtain net shapes without cost of machining metals
  • Inherent corrosion resistance of plastics
  • Chemical resistance with appropriate polymer
  • Environmentally-friendly alternative for lead

Typical Applications

  • Mimic metal heft
  • Cosmetic containers
  • Plated articles
  • Swinging sporting goods
  • Vibration dampening
  • Sound deadening
  • Ballasts
  • Lead replacement
  • Ammunition
  • X-ray/radiation shielding

Typical Properties for Density Modified Nylon 6 Compounds

Glass Bubble Nylon 6 Unmodified Nylon 6 2.0 Density Nylon 6 4.0 Density Nylon 6 5.75 Density Nylon 6
Specific Gravity 0.92 g/cm3 1.13 g/cm3 2.0 g/cm3 4.0 g/cm3 5.75 g/cm3
Notched Impact 0.3 ft/lbs/in 16 J/m 0.8 ft/lbs/in 43 J/m 1.2 ft/lbs/in 64 J/m 1.0 ft/lbs/in 53 J/m 0.9 ft/lbs/in 48 J/m
Tensile Strength 7,000 psi 48 MPa 11,000 psi 76 MPa 8,000 psi 55 MPa 6,500 psi 45 MPa 4,000 psi 28 MPa
Tensile Modulus 0.80 x106 psi 5,516 MPa 0.40 x106 psi 2,758 MPa 0.75 x106 psi 5,171 MPa 0.60 x106 psi 4,137 MPa 1.50 x106 psi 10,342 MPa
Flexural Strength 10,000 psi 69 MPa 16,000 psi 110 MPa 13,000 psi 90 MPa 12,000 psi 73 MPa 9,000 psi 92 MPa
Flexural Modulus 0.70 x106 psi 4,826 MPa 0.43 x106 psi 2,965 MPa 0.48 x106 psi 3,310 MPa 0.60 x106 psi 4,137 MPa 1.70 x106 psi 11,722 MPa


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