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Technical Data Sheet
Eastman™ Cellulose Acetate Butyrate (CAB-381-2 BP)

  • Auto OEM
  • Auto plastics
  • Auto refinish
  • Automotive
  • Coil coatings-appliances
  • Commerical printing inks
  • Consumer electronics
  • Graphic arts
  • Gravure printing inks
  • Motorcycles
  • Non-medical housings & hardware for elec
  • Truck/bus/RV
  • Wood coatings

Product Description
Remarkable polymers with a renewable backbone provided by nature itself.

Eastman™ Cellulose Acetate Butyrate BP (CAB-381-2BP) grade ester is a slight modification of the standard CAB-381-2 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.

Typical Properties

PropertyTypical Value, Units
Butyryl Content36 wt %
Acetyl Content14.5 wt %
Hydroxyl Content1.7 %
Colora87 ppm
Hazea20 ppm
     as Acetic Acid<0.03 wt %
Moisture Content<3 wt %
Ash Content0.05 %
Refractive Index1.475
Heat Test 
     @ 160°C for 8 hrTan melt
Melting Point175-185 °C
Specific Gravity1.2
     (Cast Film)1.2 kg/L (10.0 lb/gal)
Bulk Density 
     Poured416 kg/m3 (26 lb/ft3)
     Tapped480 kg/m3 (30 lb/ft3)
Dielectric Strength787-984 kv/cm (2-2.5 kv/mil)
Glass Transition Temperature (Tg)130 °C
Molecular Weightb 
Tukon Hardness18 Knoops
Viscosityc8.41 poise

aDetermination 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.
bPolystyrene equivalent number average molecular weight determined by gel permeation chromatography.
cViscosity 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).

Properties reported here are typical of average lots. Eastman makes no representation that the material in any particular shipment will conform exactly to the values given.

Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.