Resin Properties

• Resin Type: Isophthalic tooling polyester resin
• Color (Liquid): Dark amber / purple
• Reactivity: Medium
• Cure System: MEKP peroxide (included)
• Finish: Rigid, durable laminate with low shrink
• Application: High-performance fiberglass molds, marine laminates, structural tooling

Distinctive Advantages

• Excellent chemical resistance
• Low water absorption
• High heat distortion temperature
• Stable gel time
• High laminate strength
• SPC/SQC controlled quality
• Superior laminate physical properties

Technical Data

General Specs

• Flash Point: 89°F
• Shelf Life: Minimum 3 months
• Specific Gravity: 1.05–1.15
• Weight per Gallon: 8.74–9.57 lbs
• % Styrene Monomer: 46–50%
• Viscosity (Brookfield LVF): 325–525 cps
• Thixotropic Index: 1.5
• Gel Time @ 1.25% MEKP: 20–24 minutes

Color

• Liquid: Purple-opaque

Mechanical Properties

• Barcol Hardness: 38
• Heat Distortion Temperature: 106°C
• Tensile Strength: 7,300 psi
• Tensile Modulus: 5.34 x10⁵ psi
• Tensile Elongation: 1.5%
• Flexural Strength: 15,250 psi
• Flexural Modulus: 6.27 x10⁵ psi
• Compressive Strength: 12,700 psi
• Water Absorption (24 hr): 0.19%
• Water Absorption (2 hr boiling): 51%

Cure Conditions

• Clear casting with 1.25% MEKP
• Overnight room-temperature cure
• Two-hour post-cure recommended @ 250°F

Catalyst included with all resin sizes.
(1 Quart = 1 oz catalyst, 1 Gallon = 2 oz, 5 Gallon = 6 oz)

Application Notes

• Designed for tooling and mold construction where strength and stability are essential
• Exhibits low shrinkage and excellent dimensional stability
• Performs significantly better than orthophthalic resins in heat resistance and mechanical strength
• Requires standard MEKP catalyst for cure
• Can be laminated with fiberglass mat, cloth, woven roving, or biaxial fabrics

Safety

• Use in a well-ventilated area
• Contains styrene — avoid inhalation
• Wear gloves and eye protection
• Follow all MEKP handling precautions
• Keep away from heat, sparks, and flame

• 404 Tooling Polyester Resin
• MEKP Catalyst

Perfect for:

• 
  Fiberglass mold construction
  
• 
  Marine applications (boat hulls, tooling plugs, repair work)
  
• 
  Projects requiring durability under heat and stress