Structural Composites’ 



ISO 9001:2015 Registered for Design Assistance, Manufacture and Testing of Composite Products

Research and Development
Composite structures and materials, Manufacturing Process Development, Government and Commercial
Research and development, Structural design and analysis, Finite Element Analysis, CAD, and Scale up planning
Rapid prototyping and low volume production
Testing- Sigma Labs
Industry standard testing- ASTM,ISO,RTP,DNV, USCG, Others.
Sigma Labs

Industry Standard & Custom Testing:

Mechanical Properties

  • Flex, Tensile, Compression, Shear, Flexure (four-point bend)

Physical Properties

  • Heat Deflection, Accelerated Weathering


  • Hot/Cold, Humidity, Salt Spray, Cryogenic, Water Bath, Impact

Resin and Gel Coat

  • Hardness, Ratio, Blister, Opacity/Film Cure, Fineness of Grind, Viscosity

Specialized Test Equipment:

Load Cells

  • 30-kip, 60-kip and 120-kip Mechanical Test Machines
  • Environmental Test Chamber for Hot/Cold Testing (-100°F to 600°F)

Specimen Preparation

  • Composite Panel Fabrication

· Waterjet Cutting

Environmental Conditioning

  • Temperature/Humidity Chamber
  • Salt Spray Chamber
  • Cryogenic Freezer
  • Muffle Furnace
  • Water Bath
4-Point Bend Test

Typical ASTM Tests:

ASTM C297: Flatwise Tensile Strength

ASTM D256: Impact Resistance

ASTM D570: Water Absorption

ASTM D638: Tensile Strength / Modulus

ASTM D695: Comp. Strength / Modulus

ASTM D790: Flexural Strength

ASTM D792: Density and Specific Gravity

ASTM D953: Bearing Strength

ASTM D1781: Climbing Drum Peel

ASTM D2344: Short-Beam Shear Strength

ASTM D2471: Gel Time & Peak Exotherm

ASTM D2734: Void Content

ASTM D3039: Tensile Strength / Modulus

ASTM D3165: Single Lap Shear

ASTM D3171: Resin Content

ASTM D3846: In-Plane Shear Strength

ASTM D5229: Moisture Absorption

ASTM D5628: Drop Impact Test

ASTM D5766: Tensile Strength, Open Hole

ASTM D6272: 4-Point Flexure

ASTM D7250: Sandwich Flexure (3-Point)