Chemical synonym
Cellulose Acetate Butyrate
Product description
Eastman Cellulose Acetate Butyrate (CAB-381-20) is a cellulose ester with high butyryl content and high astm(a) viscosity.
Other than a higher viscosity and higher molecular weight, this cellulose ester shares the same general characteristics as CAB-381-0.1 and cab-381-0.5.
CAB-381-20 offers a combination of solubility and compatibility, moisture resistance, excellent surface hardness, and good film strength.
CAB-381-20 is supplied as a dry, free-flowing powder.
Eastman cellulose esters are based on up to sixty percent cellulose, one of the most abundant natural renewable resources.
Aerosol coatings
Aerospace coatings
Architectural coatings
Auto oem
Auto plastics
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Building materials
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| Property | Typical Value, Units |
| General | |
| Butyryl Content | 37 wt % |
| Acetyl Content | 13.5 wt % |
| Hydroxyl Content | 1.80% |
| Viscosityc | 76 poise |
| Colora | 125 ppm |
| Hazea | 35 ppm |
| Acidity as Acetic Acid | <0.03 wt % |
| Ash Content | 0.05% |
| Refractive Index | 1.475 |
| Heat Test @ 160°C for 8 hr | Tan melt |
| Melting Point | 195-205 °C |
| Specific Gravity | 1.2 |
| Wt/Vol (Cast Film) | 1.2 kg/L (10.0 lb/gal) |
| Bulk Density | |
| Poured | 336 kg/m3 (21 lb/ft3) |
| Tapped | 432 kg/m3 (27 lb/ft3) |
| Dielectric Strength | 787-984 kv/cm (2-2.5 kv/mil) |
| Molecular Weightb Mn | 70000 |
| Glass Transition Temperature (Tg) | 141 °C |
| Tukon Hardness | 18 Knoops |
a Determination of color and haze made on a solution of the cellulose ester dissolved in mibk using pt-co color standards and johns-manville celite (diatomaceous silica products) haze standards.
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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