Product description
Eastman cellulose acetate butyrate (CAB-381-20bp), 100% grade ester is a slight modification of the standard CAB-381-20 cellulose acetate butyrate and has a lower viscosity.
The BP grade was designed primarily to meet the needs of European formulators.
Eastman cellulose esters are based on up to sixty percent cellulose, one of the most abundant natural renewable resources.
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| Property | Typical Value, Units |
| General | |
| Butyryl Content | 36 wt % |
| Acetyl Content | 15.5 wt % |
| Colora | 68 ppm |
| Hazea | 7 ppm |
| Acidity as Acetic Acid | 0.03 wt % max. |
| Moisture Content | 3 wt % |
| Ash Content | 0.05% |
| Refractive Index | 1.475 |
| Heat Test @ 160°C for 8 hr | Tan melt |
| Melting Point | 185-195 °C |
| Specific Gravity | 1.2 |
| Wt/Vol (Cast Film) | 1.2 kg/L (10.0 lb/gal) |
| Bulk Density | |
| Poured | 336kg/m3 (21 lb/ft3) |
| Tapped | 432kg/m3 (27 lb/ft3) |
| Dielectric Strength | 787-984 kv/cm (2-2.5 kv/mil) |
| Glass Transition Temperature (Tg) | 128 °C |
| Molecular Weightb Mn | 70000 |
| Tukon Hardness | 18 Knoops |
| Hydroxyl Content | 0.80% |
| Viscosityc | 20.8 poise |
a Determination of color and haze is made on cab solution using pt-co color standards (color) and a monodisperse latex suspension (haze). Analysis is performed with a gardner model xl-835 colorimeter.
b Polystyrene equivalent number average molecular weight determined by gel permeation chromatography.
c Viscosity determined by astm method d 1343. Results converted to poises (astm method d 1343) using the solution density for formula a as stated in astm method d 817 (20% cellulose ester, 72% acetone, 8% ethyl alcohol).
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