Reference numbe r
ISO 8770:2003(E)
© ISO 2003
  
 
 INTERNATIONAL 
STANDARD  ISO
8770
Second edition
2003-11-15
Plastics piping systems for soil and 
waste discharge (low and high temperature) inside buildings — Polyethylene (PE) 
Systèmes de canalisations en plastique pour l'évacuation des eaux-
vannes et des eaux usées (à basse et à haute température) à l'intérieur 
des bâtiments — Polyéthylène (PE) 
 ISO 8770:2003(E) 
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ii © ISO 2003 — All rights reserved
  ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  iii
 Contents Page 
Foreword....................................................................................................................... ..................................... iv  
Introduction ................................................................................................................... ..................................... v  
1 Scope........................................................................................................................ .............................. 1  
2 Normative references ......................................................................................................... .................. 1  
3 Symbols and abbreviated...................................................................................................... ............... 2  
4 Material..................................................................................................................... .............................. 3  
5 General characteristics ...................................................................................................... .................. 4  
6 Geometrical characteristics.................................................................................................. ............... 4  
7 Physical characteristics ..................................................................................................... ................ 18  
8 Performance requirements ..................................................................................................... ........... 19  
9 Sealing rings................................................................................................................ ........................ 19  
10 Marking..................................................................................................................... ............................ 20  
11 Installation of piping systems .............................................................................................. ............. 21  
Annex A  (informative)  Additional characteristics of PE pipes and fittings ................................................ 22  
Bibliography ................................................................................................................... .................................. 23  
 ISO 8770:2003(E) 
iv © ISO 2003 — All rights reserved
 Foreword 
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies 
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO 
technical committees. Each member body interested in a subject for which a technical committee has been 
established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards 
adopted by the technical committees are circulated to the member bodies for voting. Publication as an 
International Standard requires approval by at least 75 % of the member bodies casting a vote. 
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent 
rights. ISO shall not be held responsible for identifying any or all such patent rights. 
ISO 8770 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the 
transport of fluids , Subcommittee SC 1, Plastics pipes and fittings for soil, waste and drainage (including land 
drainage) . 
This second edition cancels and replaces the first edition (ISO 8770:1991), which has been technically revised. ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  v
 Introduction 
Pipes and fittings conforming to this International Standard also meet the requirements of EN 1519-1 which 
are applicable to those pipes and fittings which, according to EN 1519-1, are intended to be used inside 
buildings (application area code “B”, see EN 1519-1) only. 
 INTERNATIONAL STANDARD ISO 8770:2003(E)
 
© ISO 2003 — All rights reserved  1
 Plastics piping systems for soil and waste discharge (low and 
high temperature) inside buildings — Polyethylene (PE)  
1 Scope 
This International Standard specifies the requirements for solid-wall polyethylene (PE) pipes and fittings for 
soil and waste discharge (low and high temperature) inside buildings, as well as the system itself. It does not 
include buried pipework. 
It also specifies the test parameters for the test methods referred to in this International Standard. This International Standard is applicable to PE pipes and fittings, as well as assemblies of such pipes and 
fittings, intended to be used for the following purposes: 
a) soil and waste discharge pipework for the conveyance of domestic waste waters (low and high 
temperature); 
b) ventilation pipework associated with a); 
c) rainwater pipework inside the building. It is applicable to pipes and fittings designed for jointing by means of elastomeric sealing rings or by butt 
fusion or electrofusion. 
2 Normative references 
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies. 
ISO 265-1, Pipes and fittings of plastics materials — Fittings for domestic and industrial waste pipes — Basic 
dimensions: Metric series — Part 1: Unplasticized poly(vinyl chloride) (PVC-U) 
ISO 1133:1997, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate 
(MVR) of thermoplastics  
ISO 3126: —
1), Plastics piping systems — Plastics components — Determination of dimensions  
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage 
applications — Part 1: Vulcanized rubber  
EN 681-2, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage 
applications — Part 2: Thermoplastic elastomers  
EN 728, Plastics piping and ducting systems — Polyolefin pipes and fittings — Determination of oxidation 
induction time 
                                                      
1) To be published. (Revision of ISO 3126:1974) ISO 8770:2003(E) 
2 © ISO 2003 — All rights reserved
 EN 743:1994, Plastics piping and ducting systems — Thermoplastics pipes — Determination of the 
longitudinal reversion 
EN 744, Plastics piping and ducting systems — Thermoplastics pipes — Test method for resistance to 
external blows by the round-the-clock method 
EN 763:1994, Plastics piping and ducting systems — Injection-moulded thermoplastics fittings — Test method 
for visually assessing effects of heating 
EN 1053, Plastics piping systems — Thermoplastics piping systems for non-pressure applications — Test 
method for watertightness 
EN 1054, Plastics piping systems — Thermoplastics piping systems for soil and waste discharge — Test 
method for airtightness of joints 
EN 1055:1996, Plastics piping systems — Thermoplastics piping systems for soil and waste discharge inside 
buildings — Test method for resistance to elevated temperature cycling 
3 Symbols and abbreviations 
3.1 Symbols 
A length of engagement 
B length of lead-in 
C depth of sealing zone 
de outside diameter (at any point) 
dem mean outside diameter 
dn nominal outside diameter 
ds inside diameter of the socket 
dsm mean inside diameter of the socket 
DN nominal size 
DN/OD nominal size (outside-diameter related) 
e wall thickness (at any point) 
em mean wall thickness 
e2 wall thickness of the socket 
e3 wall thickness at the groove 
E wall thickness of an electrofusion socket 
L1 length of spigot 
L2 depth of penetration ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  3
 L3 length of fusion zone 
L4 unheated length of an electrofusion socket 
l effective length of a pipe 
N effective insertion depth 
R radius of swept fittings 
z design length ( z-length) of a fitting 
α nominal angle of a fitting 
3.2 Abbreviations 
PE polyethylene 
MFR melt mass-flow rate OIT oxidation induction time 
4 Material 
4.1 PE compound 
The compound for pipes and fittings shall be PE based material to which may be added those additives that 
are needed to facilitate the manufacture of components conforming to the requirements of this International Standard. 
In order to conform to national requirements on fire regulations, other additives may be used. 
Fabricated fittings or parts of fabricated fittings shall be made from pipes and/or mouldings conforming to this 
International Standard, except for the requirements for the wall thickness of fabricated fittings and/or mouldings from PE which conform to material and physical characteristics as required in this International Standard. 
4.2 Reprocessable and recyclable material 
In addition to virgin material, the use of reprocessable material obtained during the production and testing of products conforming to this International Standard is permitted. External reprocessable or recyclable material 
shall not be used. 
NOTE Definitions concerning materials are given in EN 1519-1. 
4.3 Melt mass-flow rate 
The MFR of the PE base material shall be determined in accordance with ISO 1133:1997, using set of 
conditions T (temperature: 190 °C, load: 5 kg). 
Pipes and fittings shall be made from materials with an MFR lying in the following range: 
0,2 g/10 min u MFR (190/5) u 1,1 g/10 min ISO 8770:2003(E) 
4 © ISO 2003 — All rights reserved
 4.4 Fusion-jointing compatibility 
Compounds designated PE 63, PE 80 and PE 100 having an MFR (190/5) lying in the range given in 4.3 shall 
be considered to be compatible for fusion-jointing to each other. 
4.5 Thermal stability 
When determined in accordance with EN 728, using a test temperature of 200 °C, the oxidation induction time 
(OIT) of the material shall be not less than 20 min. 
NOTE This requirement for thermal stability is only applicable to materials for pipes and fittings intended for butt 
fusion. 
4.6 Sealing ring retaining means 
Sealing rings may be retained, using means made from plastics other than PE, provided the joints conform to 
the requirements given in Clause 8. 
4.7 Fire behaviour 
No specific requirements are set by this International Standard on fire behaviour. Attention is drawn to the need to comply with any relevant national regulations in this respect. 
5 General characteristics 
5.1 Appearance 
When viewed without magnification, the following requirements shall be met: 
 the internal and external surfaces of pipes and fittings shall be smooth, clean and free from grooving, 
blistering, impurities, pores or any other surface irregularity likely to prevent conformity of pipes and 
fittings to this International Standard; 
 each end of a pipe or fitting shall be cleanly cut, if applicable, and shall be square to its axis. 
5.2 Colour 
Pipes and fittings shall be uniformly coloured through the whole wall. 
The recommended colour for pipes and fittings is black. 
6 Geometrical characteristics 
6.1 General 
All dimensions shall be measured in accordance with ISO 3126. The figures given in this International Standard are schematic sketches only, to indicate the relevant 
dimensions. They do not necessarily represent manufactured components. The dimensions given shall be conformed to however. ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  5
 6.2 Dimensions of pipes 
6.2.1 Outside diameter 
The mean outside diameter, dem, shall conform to Table 1 or Table 2, as applicable. 
Table 1 — Mean outside diameters 
(metric series)  
Dimensions in millimetres 
Nominal size Nominal outside 
diameter Mean outside diameter 
DN/OD dn d em 
  min. max.  
32 
40 
50 
56 
63 32 
40 
50 
56 
63 32,0 
40,0 
50,0 
56,0 
63,0 32,3 
40,4 
50,5 
56,5 
63,6 
    
75 80 
90 
100 
110 75 
80 
90 
100 
110 75,0 
80,0 
90,0 
100,0 
110 75,7 
80,8 
90,9 
100,9 
111 
    
125 160 
200 
250 
315 125 
160 
200 
250 
315 125,0 
160,0 
200,0 
250,0 
315,0 126,2 
161,5 
201,8 
252,3 
317,9 
 
Table 2 — Mean outside diameters 
(series based on inch dimensions)  
Dimensions in millimetres 
Nominal size Nominal outside 
diameter Mean outside diameter 
DN/OD dn dem 
  min. max. 
38 
44 
57 38 
44 
57 37,9 
44,3 
57,0 38,4 
44,8 
57,5 
 ISO 8770:2003(E) 
6 © ISO 2003 — All rights reserved
 6.2.2 Effective length of pipes 
The effective length,  l, of a pipe shall not be less than that declared by the manufacturer and shall be 
measured as shown in Figure 1. For pipes with sockets, the effective length is considered to be the distance 
between the pipe ends minus the socket length. For practical reasons, this length is measured to the outside of the socket. 
 
Key 
1 single socket pipe 
2 plain-ended pipes 
a) with chamfer 
b) without chamfer 
Figure 1 — Effective length of pipes 
6.2.3 Chamfering 
If a chamfer is applied, the angle of chamfering shall be between 15° and 45° to the axis of the pipe (see 
Figure 3). When pipes without a chamfer are used, the pipe ends shall be deburred. 
The remaining wall thickness of the end of the pipe shall be at least 1/3 of emin. 
6.2.4 Wall thicknesses 
The wall thickness, e, shall conform to Table 3 or Table 4, as applicable, but for the metric series a maximum 
wall thickness at any point of up to 1,25 emin is permitted, provided that the mean wall thickness,  em, is less than 
or equal to the specified em,max . ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  7
 Table 3 — Wall thicknesses 
(metric series)  
Dimensions in millimetres 
Nominal size Nominal outside 
diameter Wall thickness 
  Pipe series 
  S 16 S 12,5 
DN/OD dn e e m e e m 
  min. max. min. max. 
32 
40 
50 
56 
63 32 
40 
50 
56 
63 3,0 
3,0 
3,0 
3,0 
3,0 3,5 
3,5 
3,5 
3,5 
3,5 3,0 
3,0 
3,0 
3,0 
3,0 3,5 
3,5 
3,5 
3,5 
3,5 
      
75 
80 
90 
100 
110 75 
80 
90 
100 
110 3,0 
3,0 
3,0 
3,2 
3,4 3,5 
3,5 
3,5 
3,8 
4,0 3,0 
3,1 
3,5 
3,8 
4,2 3,5 
3,6 
4,1 
4,4 
4,9 
      
125 
160 
200 
250 
315 125 
160 
200 
250 
315 3,9 
4,9 
6,2 
7,7 
9,7 4,5 
5,6 
7,1 
8,7 
10,9 4,8 
6,2 
7,7 
9,6 
12,1 5,5 
7,1 
8,7 
10,8 
13,6 
 
Table 4 — Wall thicknesses 
(series based on inch dimensions)  
Dimensions in millimetres 
Nominal size Nominal outside 
diameter Wall thickness 
DN/OD dn e e m 
  min. max. 
38 
44 
57 38 
44 
57 2,9 
2,9 
2,9 3,5 
3,5 
3,5 
6.3 Dimensions of fittings 
6.3.1 Outside diameters 
The mean outside diameter, dem, of the spigot end shall conform to Table 1 or Table 2, as applicable. ISO 8770:2003(E) 
8 © ISO 2003 — All rights reserved
 6.3.2 z-lengths 
The design length(s) [ z-length(s)] of fittings (see Figure 7 to Figure 21) shall be as given by the manufacturer. 
NOTE The z-length(s) of a fitting are intended to assist in the design of moulds and are not intended to be used for 
quality control purposes. ISO 265-1 may be used as a guideline. 
6.3.3 Wall thickness 
The minimum wall thickness, emin, of the body or the spigot end of a fitting shall conform to Table 3 or Table 4, 
as applicable, except that a reduction of 5 % resulting from core shifting is permitted. In such cases, the average of two opposite wall thicknesses shall be equal to or greater than the values given in Table 3 or Table 4, as applicable. 
Where a fitting or adaptor provides a transition between two nominal sizes, the wall thickness of each 
connecting part shall conform to the requirements for the applicable nominal size. In such cases, the wall 
thickness of the fitting body is permitted to change gradually from the one wall thickness to the other. 
Where a sealing ring is located by means of a retaining cap or ring (see Figure 2), the wall thickness in this 
area shall be calculated by addition of the wall thickness of the socket and the wall thickness of the retaining 
cap or ring at the corresponding places in the same cross-sectional plane. 
The wall thicknesses of fabricated fittings, except for spigot ends and sockets, may be changed locally to suit 
the fabrication process, provided that the minimum wall thickness of the body conforms to the minimum value of e
3 as given in Table 7 or Table 8, as applicable. 
 
Figure 2 — Example of calculation of wall thickness of socket with retaining cap 
6.4 Dimensions of sockets and pipe ends 
6.4.1 Dimensions of ring seal sockets and spigot ends 
6.4.1.1 Diameters and lengths 
The diameters and lengths of ring seal sockets and spigot ends (see Figure 3, Figure 4 and Figure 5) shall 
conform to Table 5 or Table 6, as applicable, and shall be in accordance with the following conditions: 
a) where sealing rings are firmly retained, the minimum value of A and the maximum value of C shall be as 
measured to the effective sealing point (see Figure 5 for an example) and this point shall give a full 
sealing action; 
b) where sealing rings are firmly retained, the required values given for dimension B (see Figure 4) do not 
apply. 
Different designs of ring seal socket (see Figure 4) may be used, provided the joints conform to the 
requirements given in Clause 8. ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  9
  
Figure 3 — Dimensions of sockets and spigot ends for ring seal joints 
 
Figure 4 — Typical groove designs for ring seal sockets 
 
Figure 5 — Example of measurement of effective sealing point ISO 8770:2003(E) 
10 © ISO 2003 — All rights reserved
 Table 5 — Diameters and lengths of ring seal sockets and spigot ends 
(metric series)  
Dimensions in millimetres 
Nominal size Nominal 
outside 
diameter Other socket dimensions Length of 
spigot end 
   Type   a Type L a    
DN/OD dn dsm A A B C L1 
  min. min. min. min. max. min. 
32 32 32,4 28 — 5 25 46 
40 40 40,5 28 — 5 26 46 
50 50 50,6 28 85 5 28 46 
56 56 56,6 30 86 5 30 48 
63 63 63,7 31 87 5 31 49 
        
75 75 75,8 33 88 5 33 51 
80 80 80,9 34 88 5 34 54 
90 90 91 36 89 5 36 54 
100 100 101 38 89 5 38 54 
110 110 111,1 40 91 6 40 62 
        
125 125 126,3 43 93 7 43 69 
160 160 161,5 50 96 9 50 82 
200 200 201,9 58 100 12 58 98 
250 250 252,4 68 105 18 68 118 
315 315 318 81 111 20 81 144 
a Sockets of type N (normal type) and type L (long type) are designated for different lengths of pipe. Type L sockets may be used  as 
an expansion joint in fixed joint systems which do not in themselves allow for expansion and contraction. 
 
Table 6 — Diameters and lengths of ring seal sockets and spigot ends 
(series based on inch dimensions)  
Dimensions in millimetres 
Nominal size Nominal 
outside 
diameter Other socket dimensions Length of 
spigot end 
DN/OD dn dsm A B C L1 
  min. min. min. max.  min. 
38 
44 
57 38 
44 
57 38,2 
44,7 
57,5 25 
25 
25 3,8 
3,8 
3,8 12 
15 
18 37 
40 
43 
 ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  11
 6.4.1.2 Wall thicknesses 
The wall thickness of the socket, e2, and the wall thickness in the groove area, e3, shall conform to Table 7 or 
Table 8, as applicable. 
Table 7 —  Wall thicknesses of sockets 
(metric series) 
Dimensions in millimetres 
Nominal size Nominal outside diameter Wall thicknesses 
DN/OD dn e2 e3 
  min.  min. 
32 32  2,7 2,3 
40 40 2,7 2,3 
50 50 2,7 2,3 
56 56 2,7 2,3 
63 63 2,7 2,3 
    
75 75 2,7 2,3 
80 80 2,7 2,3 
90 90 2,7 2,3 
100 100 2,8 2,4 
110 110 3,1 2,6 
    
125 125 3,6 3 
160 160 4,5 3,7 
200 200 5,6 4,7 
250 250 7 5,8 
315 315 8,8 7,3 
 
Table 8 — Wall thicknesses of sockets 
(series based on inch dimensions) 
Dimensions in millimetres 
Nominal size Nominal outside diameter Wall thicknesses 
DN/OD dn e2 e3 
  min.  min. 
38 38 2,7 2,3 
44 44 2,7 2,3 
57 57 2,7 2,3 
 ISO 8770:2003(E) 
12 © ISO 2003 — All rights reserved
 6.4.2 Dimensions of electrofusion sockets 
The dimensions of electrofusion sockets (see Figure 6) shall conform to Table 9. 
 
Figure 6 — Example of an electrofusion socket 
6.4.3 Dimensions of pipe ends for butt fusion joints 
The mean outside diameter, dem, of pipes with plain ends intended to be used for butt fusion joints shall 
conform to Table 1 or Table 2, as applicable. The wall thickness, e, shall conform to Table 3 or Table 4, as 
applicable. ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  13
 Table 9 — Dimensions of electrofusion sockets 
Dimensions in millimetres 
Nominal 
size Nominal 
outside 
diameter Other socket dimensions 
DN/OD dn dsm L2 L3 L4 E 
  min. min. min. min.  
32 32  20 10   
40 40  20 10   
50 50  20 10   
56 56  20 10   
63 63  23 10   
       
75 75 a 25 10 5 b 
80 80  25 10   
90 90  25 10   
100 100  28 15   
110 110  28 15   
       
125 125  28 15   
160 160  28 15   
200 200  50 25   
250 250  60 25   
315 315  70 25   
a The mean inside diameter, dsm, of the socket shall be measured in a plane which is parallel to and at a 
distance of L4 + 0,5 L3 from the socket mouth. The mean inside diameter of a socket shall be specified by the 
manufacturer in such a way that, after assembly and fusion- jointing of pipes and fittings, the joints will conform 
to the requirements given in Clause 8. 
b The wall thickness, E, of the electrofusion socket shall be at least equal to the minimum wall thickness, 
emin, of the corresponding pipe conforming to Table 3. 
 
6.5 Types of fitting 
This International Standard is applicable to the following types of fitting. Other designs of fittings are permitted. 
a) Bends (see Figure 7, 8, 9, 10, 11 or 12): 
 unswept or swept angle (see ISO 265-1); 
 spigot/socket or socket/socket; 
 butt-fused from segments. 
The nominal angle, α, may be selected from the following: 15°, 22°30 ¢, 30°, 45°, 67°30 ¢, 80°, 87°30 ¢ to 90°. 
b) Branches and reducing branches (branching single or multiple) (see Figure 13, 14, 15, 16, 17, 18 or 19): 
 unswept or swept angle (see ISO 265-1); 
 spigot/socket or socket/socket. 
The nominal angle, α, may be selected from the following: 45°, 67°30 ¢, 87°30 ¢ to 90°. ISO 8770:2003(E) 
14 © ISO 2003 — All rights reserved
 If other angles are required, they shall be agreed between the manufacturer and purchaser and be identified 
accordingly. 
c) Reducers (see Figure 20). 
d) Access fittings (see Figure 21). 
 The inside diameter of the cleaning hole shall be as specified by the manufacturer. 
e) Couplers: 
 double-socket (see Figure 22); 
 repair collar (see Figure 23). 
f) Push-fit sockets for butt fusion of pipe ends (see Figure 24). 
g) Plugs (see Figure 25). 
  
Figure 7 — Bend with single socket (unswept) Figure 8 — Bend with single socket (swept) 
 
  
Figure 9 — Bend with only sockets (unswept) Figure 10 — Bend with only sockets (swept) ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  15
   
Figure 11 — Bend, butt-fused from segments Figure 12 — Bend with single socket, butt-fused 
from segments 
 
 
 
Figure 13 — Branch (unswept) Figure 14 — Reducing branch (unswept) 
 ISO 8770:2003(E) 
16 © ISO 2003 — All rights reserved
   
Figure 15 — Reducing branch (swept) Figure 16 — Reducing branch with only sockets 
(swept) 
 
 
 
Figure 17 — Butt fusion branch Figure 18 — Double branch 
 ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  17
  
Figure 19 — Angular double branch 
 
Figure 20 — Reducer 
 ISO 8770:2003(E) 
18 © ISO 2003 — All rights reserved
   
Figure 21 — Access fitting with round cleaning hole Figure 22 — Double-socket (coupler) 
 
  
Figure 23 — Repair collar Figure 24 — Push-fit socket for butt 
fusion of pipe ends Figure 25 — Plug  
7 Physical characteristics 
7.1 Physical characteristics of pipes 
When determined in accordance with the methods specified in Table 10, using the parameters indicated, the 
physical characteristics of pipes shall conform to the requirements given in Table 10. 
Table 10 — Physical characteristics of pipes 
Characteristic Requirements Test parameters Test method 
Longitudinal reversion a u 3 % Test temperature (110 ± 2) °C EN 743:1994 
 The pipe shall exhibit no 
bubbles or cracks Immersion time 30 min Method A: Liquid 
  or 
  Test temperature (110 ± 2) °C EN 743:1994 
  Immersion time for:  Method B: Air 
  e u 8 mm 60 min  
  e > 8 mm 120 min  
Melt mass-flow rate (MFR) Permitted max. deviation 
when processing the 
compound into a pipe: 
0,2 g/10 min Temperature 
Load 190 °C 
5 kg ISO 1133:1997 
Set of conditions T 
a The choice of method A or method B is the responsibility of the manufacturer. ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  19
 7.2 Physical characteristics of fittings 
When determined in accordance with the methods specified in Table 11 and Table 12, using the parameters 
indicated, the physical characteristics of fittings shall conform to the requirements given in Table 11 or 
Table 12, as applicable. 
Table 11 — Physical characteristics of fittings 
Characteristic Requirements Test parameters Test method 
Effects of heating a Test temperature (110 ± 2) °C EN 763:1994 
  Heating time 60 min Method A: 
Air oven 
a 1) The depth of any cracks, delaminations or blisters shall not exceed 20 % of the wall thickness around the injection point(s ). No part of 
the weld line shall be open to a depth of more than 20 % of the wall thickness. 
 2) When fittings are manufactured from pipes, the pipes shall conform to the requirements given in Table 10.  3) Mouldings that are used for fabricated fittings may be tested separately. 
Table 12 — Physical characteristics of fabricated fittings 
Characteristic Requirement Test parameters Test method 
Watertightness a No leakage Water pressure 0,5 bar EN 1053 
  Duration 1 min  
a Only for fabricated fittings made from more than one piece. A sealing ring retaining element is not considered as a piece. 
8 Performance requirements 
When determined in accordance with the methods specified in Table 13, using the parameters indicated, the 
fitness-for-purpose characteristics of the joints and the system shall conform to the requirements given in Table 13. 
Table 13 — Fitness-for-purpose characteristics of the system 
Characteristic Requirement Test parameters Test method 
Watertightness a No leakage Shall conform to EN 1053 EN 1053 
Airtightness a No leakage Shall conform to EN 1054 EN 1054 
Elevated-temperature 
cycling No leakage before or 
after test 
Sagging for DN u 50: 
u 3 mm 
Sagging for DN > 50: 
u 0,05 dn Shall conform to EN 1055 Test assembly a) 
(Figure 1 and/or 3) 
of EN 1055:1996 
a Not required for butt fusion joints. 
9 Sealing rings 
9.1 Sealing rings shall not have any detrimental effects on the properties of the pipe or fitting. 
9.2 Various designs of sealing ring for ring seal sockets are permitted provided that the joints produced 
using them conform to the requirements specified in Clause 8. 
Materials for sealing rings shall conform to EN 681-1 or EN 681-2, as applicable. ISO 8770:2003(E) 
20 © ISO 2003 — All rights reserved
 10 Marking 
10.1 General 
10.1.1 Marking elements shall be labelled or printed or formed directly on the component in such a way that 
legibility is maintained during storage, weathering, handling and installation, as well as during the subsequent 
use of the component. 
NOTE The manufacturer is not responsible for marking being illegible due to actions caused during installation and 
use such as painting, scratching or covering of the components or by use of detergents, etc., on the components unless 
agreed or specified by the manufacturer. 
10.1.2 Marking on a pipe or fitting shall not initiate cracks or other defects likely to prevent conformity to the 
requirements of this International Standard. 
10.2 Minimum required marking of pipes 
The minimum marking required for pipes is specified in Table 14. 
Pipes shall be marked at intervals of, at the maximum, 1 m, and at least once per pipe. Pipes with a length 
less than 1 m may be marked with a label at least once per pipe. 
Table 14 — Minimum required marking of pipes 
Item Marking or symbol 
Number of this International Standard 
Manufacturer's name and/or trade mark 
Nominal size 
Minimum wall thickness 
Material 
Type of socket 
Manufacturer's information ISO 8770 
XXX 
e.g. DN 110 
e.g. 3,4 
PE 
e.g. Type N 
a 
a To ensure traceability, the following details shall be given: 
— the production period (year and month), in figures or in code; 
— a name or code for the production site if the manufacturer is producing at different sites. 
10.3 Minimum required marking of fittings 
The minimum marking required for fittings is specified in Table 15, whereby the manufacturer's information 
may be either on the fitting or on the packaging. If the manufacturer's information is on the packaging, it shall 
be determined by national requirements. 
Table 15 — Minimum required marking of fittings 
Item Marking or symbol 
Number of this International Standard ISO 8770 
Manufacturer's name and/or trade mark XXX 
Nominal size e.g. DN 110 
Minimum wall thickness e.g. 3,4 
Nominal angle e.g. 67°30 ¢ 
Material PE 
Type of socket e.g. Type N 
Manufacturer's information a 
a To ensure traceability, the following details shall be given: 
— the production period (year and month), in figures or in code; 
— a name or code for the production site if the manufacturer is producing at different sites. ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  21
 11 Installation of piping systems 
For the installation of pipes and fittings conforming to this International Standard, national and/or local 
requirements and relevant codes of practice shall apply. 
In addition, the pipe manufacturer may give a recommended practice for installation which covers the 
transport, storage and handling of the pipes and fittings as well as to the installation in accordance with the 
applicable national and/or local instructions. 
For external above-ground applications, additional requirements depending on the climate shall be agreed 
between the manufacturer and the purchaser. 
Guidance on installation may be found in ISO/TR 7024. ISO 8770:2003(E) 
22 © ISO 2003 — All rights reserved
 Annex A  
(informative) 
 
Additional characteristics of PE pipes and fittings 
A.1 General 
EN 476 specifies the general requirements for components used in discharge pipes, drains and sewers for 
gravity systems. Pipes and fittings conforming to this International Standard fully meet these requirements. 
Additional information is given in this annex. 
A.2 Material characteristics 
Pipes and fittings conforming to this International Standard generally have the following characteristics: 
 Modulus of elasticity E1 min  W 700 MPa; 
 Average density ≈ 0,94 g/cm3; 
 Average coefficient of linear expansion ≈ 0,2 mm/m ⋅K; 
 Thermal conductivity ≈ 0,4 W/m ⋅K; 
 Specific heat capacity ≈ 2 300 J/kg ⋅K to 2 900 J/kg ⋅K; 
 Surface resistance > 1013 Ω. 
A.3 Chemical resistance 
PE piping systems conforming to this International Standard are resistant to corrosion by water with a wide 
range of pH-values such as soil and waste water, rain water, surface water and ground water. 
If piping systems conforming to this International Standard are to be used for waste water contaminated with 
chemicals, such as industrial discharges, their chemical and temperature resistance will also have to be taken 
into account. 
Guidance is given on the chemical resistance of PE in ISO/TR 10358 and for rubber materials in ISO/TR 7620. ISO 8770:2003(E) 
© ISO 2003 — All rights reserved  23
 Bibliography 
[1] ISO 161-1, Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and 
nominal pressures — Part 1: Metric series  
[2] ISO 161-2, Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and 
nominal pressures — Part 2: Inch-based series  
[3] ISO 3633, Plastics piping systems for soil and waste discharge (low and high temperature) inside 
buildings — Unplasticized poly(vinyl chloride) (PVC-U)  
[4] ISO 4065, Thermoplastics pipes — Universal wall thickness table  
[5] ISO/TR 7024, Above-ground drainage — Recommended practice and techniques for the installation of 
unplasticized polyvinyl chloride (PVC-U) sanitary pipework for above-ground systems inside buildings  
[6] ISO/TR 7620, Rubber materials — Chemical resistance  
[7] ISO 7671, Plastics piping systems for soil and waste discharge (low and high temperature) inside 
buildings — Polypropylene (PP)  
[8] ISO 7675, Plastics piping systems for soil and waste discharge (low and high temperature) inside 
buildings — Chlorinated poly(vinyl chloride) (PVC-C)  
[9] ISO 7682, Plastics piping systems for soil and waste discharge (low and high temperature) inside 
buildings — Acrylonitrile-butadiene-styrene (ABS)  
[10] ISO/TR 10358, Plastics pipes and fittings — Combined chemical-resistance classification table  
[11] ISO 19220, Plastics piping systems for soil and waste discharge (low and high temperature) inside 
buildings — Styrene copolymer blends (SAN + PVC)  
[12] EN 476, General requirements for components used in discharge pipes, drains and sewers for gravity 
systems  
[13] EN 1329-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the 
building structure — Unplasticized poly(vinyl chloride) (PVC-U) — Part 1: Specifications for pipes, fittings and the system  
[14] EN 1451-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the 
building structure — Polypropylene (PP) — Part 1: Specifications for pipes, fittings and the system  
[15] EN 1453-1, Plastics piping systems with structured-wall pipes for soil and waste discharge (low and 
high temperature) inside buildings — Unplasticized poly(vinyl chloride) (PVC-U) — Part 1: Specifications for pipes and the system  
[16] EN 1455-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the 
building structure — Acrylonitrile-butadiene-styrene (ABS) — Part 1: Requirements for pipes, fittings 
and the system  
[17] EN 1519-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the 
building structure — Polyethylene (PE) — Part 1: Specifications for pipes, fittings and the system  
[18] EN 1565-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the 
building structure — Styrene copolymer blends (SAN 
+ PVC) — Part 1: Specifications for pipes, fittings 
and the system  ISO 8770:2003(E) 
24 © ISO 2003 — All rights reserved
 [19] EN 1566-1, Plastics piping systems for soil and waste discharge (low and high temperature) within the 
building structure — Chlorinated poly(vinyl chloride) (PVC-C) — Part 1: Specifications for pipes, fittings 
and the system  
[20] EN 12056-1, Gravity drainage systems inside buildings — Part 1: General and performance 
requirements  
[21] ENV 13801, Plastics piping systems for soil and waste discharge (low and high temperature) within the 
building structure — Thermoplastics — Recommended practice for installation  
[22] RAL 840-HR2), Colour register  
                                                      
2) Obtainable from national standards institutes. ISO 8770:2003(E) 
ICS  83.140.30; 91.140.80 
Price based on 24 pages 
© ISO 2003 — All rights reserved