This specification describes the requirements and characteristics of
APC GAL galvanized pipes (galvanized pipes coated with blue extruded
polyethylene). APC GAL pipes are externally coated using modern
extrusion-coating technology. The pipes are designed for transportation
of fluids at temperatures not higher than 80 ºC, and are suitable for laying
underground, inside buildings and for use underwater. APC GAL
galvanized pipes are manufactured according to Israeli Standard 1205.1
requirements for domestic plumbing.
2. Materials and coating 2.1 Pipes and materials
The pipes and materials used in preparation of the coating comply with
their relevant standards and specifications as listed below:
The pipes comply with requirements of Israeli Standard 103
(standard B) or 593 (schedule 40).
a. Epoxy base material
A special epoxy suitable for application on heated pipes which is
cured by the heat of the pipe.
b. Adhesive material
A thermoplastic copolymer based on polyolefin resins with polar
groups and used for adhesion of the coating to the pipe surface.
c. Coating material
High density polyethylene (HDPE) containing colors and stabilizers
against oxidation and radiation.
2.2 Coating layers
The pipe coating has three-bonded layers.
2.2.1 Base layer - The foundation base layer of the coating is made of
epoxy resin at thickness of 100 μ.
2.2.2 Adhesive layer – The intermediate layer of material bonds
between the base and outer layers.
2.2.3 External layer – The external layer is of high density polyethylene
(HDPE) stabilized and painted blue.
2.3 Coating process
2.3.1 Preparation of pipe surface
Prior to application of the coating, the pipe is cleaned of dirt, oil
and rust. The surface is blasted by steel grits. (Note: The
thickness of the zinc layer following cleaning is at least 30 μ).
Prior to application of the coating the pipe is heated to the
temperature recommended by the manufacturer.
2.3.3 Base layer coating
Immediately following the heating of the pipe, epoxy is sprayed
onto the hot pipe.
2.3.4 Protective layer coating
Two layers are applied to the surface of the pipe using co-
After coating, the pipe is cooled with water.
3. Requirements and tests
3.1 Cleanliness level – The level of cleanliness is visually assessed.
3.2 Overall thickness of coating – The minimum overall thickness of the
coating is 1.5mm.The thickness may be up to 10% less than the
declared value on condition that the thinnest area is not more than 5cm,
along the entire length of the pipe.
3.3 Coating continuity – The coating should be continuous (without any
holes). The coating is considered continuous if no faults are found in
a Holiday Detector test at a voltage of 10kv along every millimeter of
3.4 Bond strength – Not less than 24 hours from the time of manufacture,
the average required strength (minimum) for separation of the coating
from the pipe will be 80N/cm.
3.5 Impact resistance – A 25mm diameter ball-shaped weight is dropped
on the coated area from a height of 1 meter. This exercise is repeated
at ten points along the length of the pipe with intervals of at least 30mm
between each point. The energy produced by this impact is 3.5J.
3.6 Penetration assessment – The penetration depth will not exceed
0.2mm at a temperature of 23 ± 2ºC and 0.3mm at a temperature of
50± 2ºC. In this test a piece of detached coating (maximum thickness of
2cm) is loaded with 2.5kg round steel pin with a cross-section area of
3.7 Elongation at breakpoint – In the test according to part 3of Israeli
Standard 878, the elongation at breakpoint will be at least 300%.
An A' class sample is tested (diagram 2 in Standard 878) at 25 mm/min.
3.8 Electrical resistance of coating – The coating resistance assessed
following acclimatization of the sample over 100 days will not be less
3.9 Heat ageing – A coating sample (of at least 2mm thickness) is
exposed to a temperature of 100ºC for 100 days. The melt flow
rate (MFI) is then measured deviate more than 35% from its
3.10 Light ageing – The MFR will not deviate more than 35% from its
original value. A coating sample with a maximum thickness of 2mm
is exposed to a filtered xenon beam while being doused with water.
The MFR is measured at the end of the test.