Material Engineering
Comprehensive technical specifications for crown molding materials and properties.
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Wood Properties
- Moisture Content: 6-8%
- Density: 35-45 lb/ft³
- Hardness: 950-1500 Janka
- Dimensional Stability: 2.8%
- Grain Direction: Vertical
- Fire Rating: Class C
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MDF Specifications
- Density: 45-50 lb/ft³
- Internal Bond: 150 psi
- Screw Hold: 325 lb
- Modulus: 350,000 psi
- Thickness Swell: <8%
- Formaldehyde: E1 grade
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PVC/Polymer
- Impact Strength: 12 ft·lb/in
- Tensile Strength: 7,000 psi
- Heat Deflection: 165°F
- UV Resistance: 10 years
- Expansion Rate: 0.4%/20°F
- Flame Spread: 25
Installation Standards
Critical specifications for professional installation:
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Cutting Parameters
- Saw Speed: 4000-5000 RPM
- Blade TPI: 80-100
- Kerf Width: 0.087-0.094"
- Cut Angle: ±0.1°
- Feed Rate: 12 ft/min
- Chip Load: 0.001-0.003"
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Mounting Requirements
- Stud Spacing: 16" O.C.
- Nail Gauge: 15-18 GA
- Nail Spacing: 12-16"
- Joint Overlap: 1.25"
- Adhesive Coverage: 30 ft/tube
- Bond Strength: 250 psi
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Environmental Controls
- Room Temp: 65-75°F
- Humidity: 35-55%
- Acclimation: 48-72 hrs
- Air Flow: 0.5-1.5 ft/s
- Light Level: 50+ fc
- Dust Control: <5 mg/m³
Design Specifications
Key specifications for aesthetic and functional requirements:
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Profile Geometry
- Spring Angle: 38-52°
- Projection: 2.5-6.5"
- Drop: 2.5-6.5"
- Relief Depth: 0.25-0.75"
- Edge Radius: 0.125-0.250"
- Pattern Repeat: 12-48"
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Finish Standards
- Paint Adhesion: 5B ASTM
- Gloss Level: 15-85 units
- Film Build: 3-5 mils
- Coverage: 350-400 ft²/gal
- Washability: 2000+ cycles
- VOC: <50 g/L
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Performance Metrics
- Load Capacity: 8 lb/ft
- Sag Resistance: 0.5mm/ft
- Impact Rating: Grade 1
- Sound NRC: 0.15-0.25
- Thermal Movement: ±1/16"
- Service Life: 30+ years