DIN 19531:1987-11

1 Field of application
2 Dimensions, designation and symbols
      2.1 Pipes
             2.1.1 Dimensions
             2.1.2 Standard designations
      2.2 Fittings
             2.2.1 Dimensions
             2.2.2 Fitting types
                      2.2.2.1 Elbows
                      2.2.2.2 Single branches, double
                                 branches and corner double
                                 branches, with spigot end
                      2.2.2.3 Eccentric reducers
                      2.2.2.4 Parallel branches
                      2.2.2.5 87degree 30' saddles
                      2.2.2.6 Offsets
                      2.2.2.7 WC elbows
                      2.2.2.8 Wall-hung WC 90degree elbows
                      2.2.2.9 Socket plugs
                      2.2.2.10 Access pipes
                      2.2.2.11 Single straight couplings
                      2.2.2.12 Double straight couplings
                      2.2.2.13 Solvent cement sockets
                      2.2.2.14 Long sockets (twice normal
                                 length)
                      2.2.2.15 Long sockets (three times
                                 normal length)
                      2.2.2.16 Connectors for cast iron pipe
                                 spigot ends
                      2.2.2.17 Connectors for vitrified
                                 clayware pipe sockets
3 Requirements
      3.1 Materials
             3.1.1 Pipes and fittings
             3.1.2 Sealing rings
      3.2 Fire behaviour
      3.3 Design and workmanship
      3.4 Impact strength
      3.5 Heat reversion
             3.5.1 Pipes
             3.5.2 Fittings
      3.6 Watertightness
      3.7 Vicat softening temperature
      3.8 Surface finish
      3.9 Colour
      3.10 Dimensions
      3.11 Resistance to thermal stressing
      3.12 Behaviour of sealing ring during assembly
      3.13 Water absorption
      3.14 Sulphated ash content
4 Testing
      4.1 Time of testing
      4.2 Fire behaviour
      4.3 Design and workmanship
      4.4 Impact strength
      4.5 Heat reversion
             4.5.1 Pipes
             4.5.2 Fittings
      4.6 Watertightness
      4.7 Vicat softening temperature
      4.8 Surface finish
      4.9 Colour
      4.10 Dimensions
      4.11 Resistance to thermal stressing
             4.11.1 Pipes and fittings of normal wall
                      thickness
                      4.11.1.1 Alternating stress
                      4.11.1.2 Continuous stress
             4.11.2 Pipes and fittings of greater wall
                      thickness
                      4.11.2.1 Alternating stress
                      4.11.2.2 Continuous stress
             4.11.3 Test assembly
      4.12 Behaviour of sealing ring during assembly
      4.13 Water absorption
      4.14 Sulphated ash content
5 Inspection
      5.1 General
      5.2 Internal control
      5.3 Third-party inspection
6 Marking