Character position definition and scope:

A one-character alphabetic code indicates the kind of material used in the manufacture of sound recordings (both instantaneous and mass-produced).  This code is only intended to relate to a sound recording rendered on a mechanical device.

Most contemporary commercial or mass-produced 16, 33-1/3, and 45 rpm discs are made of vinyl (plastic).  Early discs were made of wax, aluminum, acetate, or shellac.  Most commercial or mass-produced 78 rpm discs are made of shellac.  Most instantaneous cylinders were made of wax.  Compact audio discs (CDs) are made of polycarbonates coated with a reflective surface (usually aluminum).

A fill character ( | ) is used when no attempt has been made to code this position.

Record requirements for National-level and Minimal-level records:  Optional.

Guidelines for applying content designators:

Code:

Description:

a

Lacquer coating

b

Cellulose nitrate

c

Acetate tape with ferrous oxide

g

Glass with lacquer  Item is a glass disc base with a lacquer coating.

i

Aluminum with lacquer  Item is an aluminum disc base with a lacquer coating.

l

Metal

m

Plastic with metal

n

Not applicable

p

Plastic

r

Paper with lacquer or ferrous oxide  Item is a paper or cardboard disc, tape, or cylinder base with a lacquer or ferrous oxide coating.

s

Shellac

u

Unknown  The kind of material used in the manufacture of the item is not known.

w

Wax

z

Other  The item cannot be described by any of the available codes.

|

No attempt to code

Content designator history:

Character position 08 (Kind of material) was moved to position 10 when field 007 was restructured in 1981.

m - Molded cylinder - mass produced  [obsolete]:  This code was made obsolete in 1981 when this characteristic was included in the definition of code p (Plastic).  The current code m was defined in 1986.

In 2016, the character position was redescribed to indicate that Kind of material is only intended to relate to a sound recording rendered on a mechanical device.

n - Not applicable  [obsolete, 2002]

a - Lacquered  [renamed, 2002]

b - Cellulose nitrate  [new, 2002]

c - Acetate tape with ferrous oxide  [new, 2002]

g - Glass with lacquer  [new, 2002]

i  - Aluminum with lacquer  [new, 2002]

m - Plastic with metal  [renamed, 2002]

nNot applicable  [new, 2016]

r  - Paper with lacquer or ferrous oxide  [new, 2002]

z - Other  [new, 2002]

To return, select:

007:  Sound recording

007  Physical Description Fixed Field