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Ensinger PEI

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General Plastics LAST-A-FOAM® FR-3720 Polyurethane Foam
Categories: Other Engineering Material; Composite Core Material; Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane Foam, Unreinforced

Material Notes: Product Description: LAST-A-FOAM® FR-3700 is a CFC-free, rigid, closed-cell, flame-retardant polyurethane foam available in densities ranging from 3 to 40 pounds per cubic foot. Tougher and less friable than our FR-6700 series, this aerospace-grade, BMS 8-133-qualified foam enables cutting of crisper edges, making it well-suited to machining complex shapes for composite cores. It exhibits a high strength-to-weight ratio due to its cellular structure and cross-linked resin. Because of its closed-cell structure, LAST-A-FOAM® FR-3700 has excellent resistance to water absorption and will not swell, crack, or split on exposure to water. LAST-A-FOAM® FR-3700 provides exceptional protection for hazardous cargo and payloads as an impact- and fire-insulation liner in transport or packaging containers. It also serves as human bone test media.

Features:

  • Stable
  • Inert
  • Resistant to most chemicals and solvents
  • Easily shaped with common woodworking tools
  • Performs well as wood replacement
  • Will not support fungal growth
Applications:
  • Models and design prototypes
  • Composite Core
  • Honeycomb edge close-out for aircraft interior sandwich panels used in overhead storage bins, passenger cabin class dividers, galleys and lavatories
  • Vacuum form dies and mold patterns

Information provided by General Plastics Manufacturing Company

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Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 5.73 lbs/ft3, cut foam surface
 71.640 lbs/ft3, cut foam surface
 
Electrical PropertiesOriginal ValueComments
Dielectric Constant 1.05 - 1.4
@Frequency 1e+6 Hz
3-20 lbs/ft3
 
Thermal PropertiesOriginal ValueComments
CTE, linear 34.0 µin/in-°F
@Temperature 23.9 - 121 °C
Thermal Conductivity 0.349 BTU-in/hr-ft²-°FASTM C518
Maximum Service Temperature, Air 250 °F
Minimum Service Temperature, Air -320 °F
 
Descriptive Properties
Closed Cell Content95%3 lbs/ft3, ASTM D2856, Procedure B
 98%25 lbs/ft3, ASTM D2856, Procedure B
Tumbling Friability (%)040 lbs/ft3, 20 mins at 60 rpm, ASTM C421
 23.63 lbs/ft3, 20 mins at 60 rpm, ASTM C421
Water Absorption0.01 lbs/ft²at 18 lbs/ft³, ASTM D2842
 0.02 lbs/ft²at 3 lbs/ft³, ASTM D2842

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