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Park Aerospace F-552

Park’s F-552 is a high purity silica filled phenolic resin coated on high strength grade silica fabric. F-552 is used in the manufacture of intermediate temperature ablative rocket nozzles, heat shields, and combustion chambers in highly oxidative environments.

Polymer Name: Phenolic Compound

Functions: Prepreg

Reinforcement Material: Other Reinforcement Material

Processing Methods: Compression Molding, Prepreg Processing

Technical Data Sheet

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Chemical Family
Phenols & Phenolics
Fillers Included
Silica
Polymer Name
Phenolic Compound
Reinforcement Material
Other Reinforcement Material
Composite Materials Functions
Prepreg
Technologies
Composite Materials
Product Families
Composite Materials — Prepregs & Molding Compounds
Thermoset Prepregs

Features & Benefits

Materials Features
Ablation Resistant
Key Features & Benefits
  • Provides a combination of high-strength and ablative properties for demanding applications.
  • Low thermal expansion
  • Good Tack and Drape properties
  • Conforms to WS-21053
  • Resin conforms to MIL-R-9299
Product Forms
  • Available in Broadgoods, Chopped Molding Compound and Bias Tape
  • Solution coated fabrics up to 38” inches wide
  • Compatible with Autoclave or Press Molding processes

Applications & Uses

Markets
Automotive & Transportation
Applications
Automotive & Transportation — Transportation
Aerospace & Aviation
Composites Processing Methods
Compression Molding,
Prepreg Processing
Applications / Qualifications
  • Rocket Nozzles
  • Combustion Chambers
  • Heat Shields
  • Rocket Motor Throat Sections
Autoclave Cure Cycle (Broadgoods)
  • Apply 24”Hg vacuum (minimum) for 1 hour before beginning heat cycle
  • Apply 10 psi autoclave pressure
  • Raise product temperature from RT to 250°F at 2 - 5°F/min
  • Increase autoclave pressure to 40psi, vent vacuum at 15 – 20 psi
  • Hold product at 250 ± 5°F for 30 minutes
  • Raise product temperature to 325 ± 5°F at 2 - 5°F/min
  • Hold product at cure temperature for 60 – 90 minutes
  • Cool to 150°F at no at no more than 8°F/min prior to releasing autoclave pressure
Press Cure Cycle (Chopped Molding Compound)
  • Apply 1,000 - 2,000 psi pressure during cure
  • Cure product at 325°F for 90 – 120 minutes

Properties

Physical Properties
ValueUnitsTest Method / Conditions
Nominal Prepreg Weight 30oz/sqyd-
Resin Solids Content29 - 36%-
Filler Content4 - 11%-
Resin Flow (325°F, 150 psi) 10 - 20%-
Volatiles (325°F, 10 min) 3 - 5.5%-
Nominal Cured Ply Thickness0.021--
Barcol Hardness70-ASTM-D-2583
CTE - With Ply (75 - 340°)5.8μin/inꞏºFASTM-E-831
CTE - Across Ply (75 - 340°)18.8μin/inꞏºFASTM-E-831
Mechanical Properties
ValueUnitsTest Method / Conditions
Specific Gravity 1.8g/ccASTM-D-792
Specific Heat0.26BTU/lb°FASTM-C-351
Thermal Conductivity - With Ply (250°F) 0.29BTU/ft2-hr°FASTM-C-177
Thermal Conductivity - Across Ply (250°F) 0.4-ASTM-C-177
Thermal Diffusivity - With Ply (250°F) 0.014ft2/hrASTM-C-177
Thermal Diffusivity - Across Ply (250°F)0.012-ASTM-C-177
Cure Cycle (325°F)1000psi-
Tensile Strength - Dry (75°F) 16.48KsiASTM-D-638
Tensile Modulus - Dry (75°F) 1.25MsiASTM-D-638
Tensile Strength - Dry (90° 75°F) 16.5KsiASTM-D-638
Tensile Modulus - Dry (90°C 75°F) 1.3MsiASTM-D-638
Compressive Strength - Dry (75°F)60.8KsiASTM-D-695
Compressive Modulus - Dry ( 75°F) 3.5MsiASTM-D-695
Compressive Strength - Dry (90° 75°F)40.3KsiASTM-D-695
Compressive Modulus - Dry (90° 75°F) 2.9MsiASTM-D-695
Short Beam Shear - Dry (75°F)5.9KsiASTM-D-2344

Regulatory & Compliance

Quality Standards
MIL-R-9299C,
WS-21053

Storage & Handling

Prepreg Storage Life
  • Out Life: 30 days @ 75°F
  • Shelf Life: 6 months @ 40°F (dry)