Marine Flotation FOam

Natural-Therm® 2250 Series is a marine foam system that meets the Title 33 CRG 183.114 (Table 1). Some of the key characteristics that differentiate Natural-Therm® 2250 from other marine foams are:

✓ High Bio-Renewable Content
✓ Consistent density distribution
✓ Good Processing characteristics
✓ Lower Exothermic Reaction for great lift thickness
 

Recommended Uses

  • General purpose pour applications
  • Molding
  • Floating devices
 

Natural-Therm® 2250 series marine foams have exceptional physical properties. The chart below helps show the relationship between applied pass thickness, polyurethane foam-in-place density, and compressive strength. Accordingly, all other physical properties will be affected by the in-place density of the polyurethane foam.

Table 183.114 – Flotation Performance Tests
TEST 183.144 (B) ENGINE ROOM BILGE (C) ENGINE ROOM UNLESS OPEN TO ATMOSPHERE (D) BILGE
(a) Vapor Test - X -
(b) 24 Hrs Gasoline Test - - X
(c) 30 Day Gasoline Test X - -
(d) 24 Hour Oil Test - - X
(e) 30 Day Oil Test X - -
(f) 24 Hour Bilge Cleaner Test - - X
(f) 30 Day Bilge Cleaner Test X - -

Typical Component Properties

  • Viscosity @ 25°C, cps
  • Specific Gravity @ 25°C, g/ml
  • Mixing Ratio, % by volume

Typical Reactivity Properties

Spray Reactivity@120°F
  • Cream Time, seconds……….38-48
  • Tack Free Time, seconds……120-130
A Component polymeric MDI Natural-Therm 2050, B Component, polyol blend
200 300
1.24 1.16
50 50

Typical Processing Parameters

Hydraulic Pressure, psi 500
Spray Pressure, psi
Hose Temperature 120°F
Static, A/B 900-1200
Preheat Temperature
120°F Dynamic, A/B 700-1000

Typical Foam Properties

Compressive Strength, 10% deflection, ASTM D-1621, parallel, psi 28
Initial K-Factor*, ASTM C-518, BTU in/hr ft2 °F 0.140
Tensile Strength, ASTM D-1623, psi 28
Water Absorption, ASTM D-2842, lb/ft2 (% by volume) 0125-0.155
Tumbling Friability, ASTM C-421 % loss 1.0-3.5
Closed Cell Content, ASTM D-2856, % >97.5
Dimensional Stability, ASTMD-2126, % volume change:
  @ -20°F @ 158°F @ 100°F/100% R.H.
7 Days 0.4 0.9 1.6
14 Days 0.7 1.13 2.0
28 Days 1.00 1.70 2.70
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This chart demonstrates the typical relationship between applied pass thickness, polyurethane foam-in-place density, and compressive strength. Accordingly, all other physical properties will be affected by the in-place density of the polyurethane foam.
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Rate of Rise Data at 50°F
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Choice criteria 1 [s] 50.0% R 20.9
Choice criteria 2 [s] 80.0% R 25.5
start time [s] 15.0 % v 14.5
rise time [s] 98.0% R 36.2
max. velocity [mm/s]   15.6
max. velocity at   18.7
max. temperature [C]   122.3