品级Grade 航空级
外观Appearance 白色粉末
红外光谱鉴别Infrared spectrometry 符合
干燥损失Loss on drying <2.0 % (10 g) (ca. 100°C)
丁醛基Butyral Content 70-75%
粘度Viscosity 15.0 - 18.0 mPa.s (c=10, EtOH 94%)
Butvar® B-98:
外观Appearance 白色易流动粉末
羟基含量Hydroxyl Content, %
(Expressed as % Polyvinyl Alcohol) 18.0-20.0
粘度Solution Viscosity, cps
(6% solids in methanol @ 20°C) 6.0-9.0
挥发份含量Volatile Content, % % 5.0 max.
乙酰基Acetate Content, (% Polyvinyl Acetate) 2.5 maximum
丁醛基Butyral Content, (% Polyvinyl Butyral) 80 (approximate)
分子量Molecular Weight* (Mw) 40,000-70,000
比重Specific Gravity 1.100
玻璃化温度Glass Transition Temperature (Tg), 72-78°C
Butvar® B-72:
外观Appearance 白色易流动粉末
羟基含量Hydroxyl Content, %
(Expressed as % Polyvinyl Alcohol) 17.5-20.0
粘度Solution Viscosity, cps
(7.5% solids in methanol @ 20°C) 170-260
挥发份含量Volatile Content, % 3.5 maximum
乙酰基Acetate Content, (% Polyvinyl Acetate) 2.5 maximum
丁醛基Butyral Content, (% Polyvinyl Butyral) 80 (approximate)
分子量Molecular Weight* (Mw) 170,000-250,000
比重Specific Gravity 1.100
玻璃化温度Glass Transition Temperature (Tg), 72-78°C
Butvar® B-76:
外观Appearance 白色易流动粉末
羟基含量Hydroxyl Content, %
(Expressed as % Polyvinyl Alcohol) 11.0-13.0
粘度Solution Viscosity, cps
(5% solids in ethanol @ 25°C) 18.0-28.0
挥发份含量Volatile Content, % 35.0 max.
乙酰基Acetate Content, (% Polyvinyl Acetate) 1.5 max
丁醛基Butyral Content, (% Polyvinyl Butyral) 88 (approximate)
分子量Molecular Weight* (Mw) 90,000-120,000
比重Specific Gravity 1.083
玻璃化温度Glass Transition Temperature (Tg), 62-72°C
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