Donfoam 812 HCFC-141B base blend polyols for block foam

Donfoam 812 HCFC-141B base blend polyols for block foam

INTRODUCTION Donfoam 812 blend polyether polyols used for produce PUR block foam. The foam has uniform cell , low thermal conductivity, thermal insulation performance is good, flame retardant performance is good, low temperature no shrinking crack etc. Widely used in the process of all kinds of insulation work such as: building external wall, cold storage, tanks, large pipes etc.

PHYSICAL PROPERTY

AppearanceDynamic viscosity （25℃）      mPa.S Density （20℃）              g/ml Storage temperature              ℃ Storage stability                 month

Light yellow to brown transparent liquid 250±50 1.17±0.1 10-25 6

RECOMMENDED RATIO

Items	PBW
Blend Polyether PolyolIsocyanate	100 130

TECHNOLOGY AND REACTIVITY (the exact value varies depending on processing conditions)

	Manual Mixing
Raw Material Temperature   ℃Mould Temperature        ℃ CT                       s GT                       s TFT                      s Free Density            kg/m3	20-25 Ambient Temperature(15-45℃ ) 35-60 140-180 240-260 26-28

FOAM PERFORMANCES

Item	Test Standard	Specification
Overall Molding DensityMolding Core Density	GB 6343	40-45kg/m3 38-42kg/m
Closed-cell Rate	GB 10799	≥90%
Initial Thermal Conductivity（15℃）	GB 3399	≤24mW/(m.K)
Compressive Strength	GB/T8813	≥150kPa
Dimensional Stability                    24h      -20℃ RH90     70℃	GB/T8811	≤1% ≤1.5%
Water Absorption Rate	GB 8810	≤3%
Flammability	ASTM E84	Class A