Rigit polyprene 23M

Polyprene 23M is a rigid polyurethane foam system blown by HCFC 141b and CO₂ (produced by the reaction of water with isocyanate). It is intended for discontinuous applications: f.e. structural metal panels for building and cool-store.

Typical Component Properties

	Units	A-23M Polyol	B – Polymeric MDI
OH number	mg KOH/g	330	-
H₂O content	%	1.7	-
NCO content	%	-	30 – 32
Viscosity, 25°C	cps	300	200
Specific Gravity, 25°C	g/cm³	1.15	1.23

Recommended Process Conditions

	Units	Values
A-23M Polyol	pbw	100
B – Polymeric MDI	pbw	115
Components temperature	°C	20 – 22
Typical moulds temperature	°C	35
Demoulding time	min	20

Typical Reaction Characteristics

	Units	Hand-mix*
Ratio	Polyol /Iso	100:115
Cream time	s	22
Gel time	s	175
Tack free time	s	390
Free rise density	kg/m³	24.6

*Data referred to laboratory tests made with Isocyanate component at 20°C and Polyol component at 20°C, hand-mixed with mechanical stirrer at 3000 rpm. Reported values vary depending on processing conditions.

Handling and Storage

The Iso component must be stored in liquid state. In case of crystallization it has to be melted heating the drum at 60-70°C for no more than 24 hours.

	Units	A-23M Polyol	B – Polymeric MDI
Storage temperature	°C	15 - 25	15 - 25
Shelf life	months	6	6

Typical Polymer Properties

These items are provided as general information only.

	Units
Overall density range	kg/m³	42
Compressive strength (10%)	MPa	0.15
Size stability (24 h aging): - at +70°C;	%	>0.1
- at -25°C	%	>0.1
Thermal conductivity	W/mK	0.021

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