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Toray BT250E-1

Toray BT250E-1 resin system is a 121°C (250°F) cure epoxy prepreg system with excellent toughness and strength. It provides an outstanding surface finish under vacuum-bag/oven-cure only. The resin system, which is self-adhesive to honeycomb and foam core, is MIL-R-9300 qualified and makes a great choice for many Applicationss in the low-tomedium-service temperature range.

Properties

Physical Form
Prepreg

Product families

Composite Materials — Prepregs & Molding Compounds
  • Thermoset Prepregs

Other characteristics

End Uses
Radomes, Reflectors, Tanks
Functions
Prepreg
Polymer Name
Epoxy Resins & Compounds
Processing Methods
Out of Autoclave Prepreg, Vacuum Bagging
Markets
  • Automotive & Transportation
  • Industrial
Product Type
121°C (250°F) Cure, Epoxy Prepreg System
Technology
Composite Materials
Composites End Use
  • Radomes
  • Reflectors
  • Tanks
Material Features
  • Excellent Toughness
  • Flame Retardant
  • Good Surface Appearance
  • High Strength
HIGHLIGHTS

Excellent system for out of autoclave cure; Toughened for good impact resistance; MIL-R-9300 qualified; Ideal for low-to-medium service temperature Applicationss

Technical data

Table 1 of 3

8 rows
CharacteristicValueUnit
Compressive Modulus2.8 (0.4)Gpa (Msi)
Compressive Strength115 (16.7)MPa (Ksi)
Flexural Modulus3.4 (0.50)Gpa (Msi)
Flexural Strain5.5%
Flexural Strength156 (22.6)MPa (Ksi)
Tensile Modulus3 (0.44)Gpa (Msi)
Tensile Strain2.5%
Tensile Strength75 (10.9)MPa (Ksi)

Table 2 of 3

2 rows
CharacteristicValueUnit
Coefficient of Thermal Expansion (CTE)71 (39)ppm/°C (ppm/°F)
Glass Transition Temperature (Tg)125 (257)°C (°F)

Table 3 of 3

6 rows
CharacteristicValueUnit
Density1.17g/cc
Dielectric Constant at 10 GHz3—
Dielectric Constant at 10 GHz on 4581 quartz3.26—
Loss Tangent at 10 GHz0.019—
Loss Tangent at 10 GHz on 4581 quartz0.0081—
Moisture Absorption after 24 hr water boil2%

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