2   5  7        16    21         31         41
    - --- -- --------- ----- ---------- ---------- ----------
   |X|   |  |XXXXXXXXX|     |          |          |          |
    - --- -- --------- ----- ---------- ---------- ----------
       |  |              |       |__________|__________|
       |  |              |                  |_(2) Material Properties (F10.0)
       |  |              |
       |  |              |_(1)Material Group Number(I5)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on Last Data Record in Data Category.(A3)
       

(1) Material group number - This number is referred to in the Element Topology Data Record (Data Category 2) and is the index to the values given in columns 21-40 (2).

(2) Material property values. Material properties may, optionally, be divided into sets for each structure (see The STRC Data Record - Coordinate Structure Association). Any element whose material group number corresponds to that given in columns 16-20 (1) has these values associated with it. Details of the properties appropriate to each element type are given below.