Ethyl cellulose |1.14 | 24.3 |[6]1.25 Cellulose acetate sheet |1.27-1.37| 21.8-20.2 |1.5-3.0 Cellulose acetate molding |1.27-1.63| 21.8-17.0 |1.4-2.8 Cellulose nitrate |1.35-1.60| 20.5-17.3 |1.0-3.0 ------------------------------+---------+--------------+----------- ------------------------------+---------------+------------------ | | Type |Effect of weak | Effect of strong | acids | acids | | ------------------------------+---------------+------------------ Synthetic resins: | | Tar-acid—Formaldehyde: | | Molded, wood flour filler |None to slight.|Varies[2] Molded, mineral filler | do | do[2] Molded, fabric filler | do | do[2] Laminated, paper base | do | do[2] Laminated, fabric base | do | do[2] Laminated, asbestos cloth | do | do[2] base | | Cast | do | Tar-acid—Furfural: | | Wood flour filler | do | do[2] Mineral filler | do | do[2] Fabric filler | do | do[2] Urea—Formaldehyde | do |Decomposed or | |surface attacked Vinyl, unfilled |Resistant |Resistant Vinyl, filled |Dependent on |Dependent on | filler. |filler. Acrylate |None |Oxidizing acids | |attack surface. Polystyrene | do |None Other plastics: | | Shellac compound |Deteriorates |Deteriorates Cold molded: | | Nonrefractory |Slight |Decomposes Refractory |Decomposes | do Rubber compounds: | | Chlorinated rubber |Resistant |Resistant Modified isomerized rubber| do | do Hard rubber | do |Attacked by | |oxidizing acids Casein | do |Decomposes Cellulose compounds: | | Ethyl cellulose |Slight |Decomposes Cellulose acetate sheet | do | do Cellulose acetate molding | do | do Cellulose nitrate | do | do ------------------------------+---------------+------------------