Plastiline™ - Humes

SUMMARY OF PRINCIPAL
PROPERTIES
1 Tensile strength
Longitudinal and transverse tensile test results exceed
17 MPa. This strength combined with excellent
mechanical interlock of keys in concrete means permanent
fixture. Weep channels prevent build-up of back pressure
caused by any moisture behind the sheet, except in the
case of fully-lined structures, where special precautions are
required.
2 Elongation
Not less than 225% at failure and together with the
tensile strength allows coverage of flexible joints without
damage to the lining.
3 Porosity
Gases and solutions will not penetrate Plastiline.
The sheet is an homogeneous extrusion, free from
pinholes. Spark testing at at least 10,000 volts after
manufacture checks the entire surface of all sheets.
4 Plasticiser permanence
Use of a stable plasticiser ensures high plasticiser
permanence. Samples recovered from live sewers after up
to 30 years in service validate this performance property.
Also the laboratory testing determined loss of plasticiser
under vastly accelerated test conditions at 90 O C does not
exceed 1%.
5 Weldability
Jointing and sealing together sections of Plastiline is
readily achieved by a trained operator using a heat fusing
process. The resultant weld is equivalent in protection to
that of the parent sheet.
6 Temperature effects
Flexibility of the sheet increases with rising temperatures
but otherwise this material is not affected by the normal
range of ambient temperatures. In most cases Plastiline
is suitable for pipeline temperatures normally encountered
and up to 80 O C for limited periods not exceeding 24 hours.
Normal steam curing of concrete does not affect
Plastiline except for temporary softening of the sheet.
7 Embedment
Keys are designed for easy embedment during the pipe
lining process and to give positive mechanical lock into the
pipe or structure. Keys will withstand a test pull
normal to the concrete, equivalent to a minimum of
14 N/mm length of key, refer Clause 11.4 page 17.
8 Water absorption
At a temperature of 23 O C the maximum water absorption
is 0.10% after 24 hours. This low percentage illustrates the
fact that water penetration is negligible and the sheet forms
an impermeable barrier.
10 Tear strength
The value of 80 N/mm minimum tear strength, both
longitudinally and transversely, reflects the toughness
of the material. Although a sharp instrument may
puncture it, there is no tendency for the perforation to
progress further.
11 Abrasion resistance
Plastiline possesses higher abrasive resistance qualities
than concrete itself. Recommended velocity limits in
sewers are 6 m/s in straight sections and 3 m/s at curves.
12 Food contact
Standard Plastiline should not be used to line food
containers.
13 Combustion
Plastiline will not support combustion.
RESISTANCE TO
AGGRESSIVE AGENTS
The ability of PVC to resist deterioration when exposed
to a wide range of chemical substances is well known.
Some of the more common substances which can collect in
sewers as effluent from industrial processes are listed
below. For information on the resistance of PVC to other
substances, enquiries may be made to Humes.
1 Acids
Completely unaffected by almost all dilute mineral and
organic acids, including sulfuric, nitric, lactic and malic.
It is also unaffected by some concentrated acids, provided
certain temperature limits are not exceeded.
2 Alkalis
Resistant to concentrated alkalis such as caustic soda,
quicklime and ammonium hydroxide.
3 Aggressive salts
Exposure to salt solutions which attack concrete or
reinforcement reveals no loss of endurance.
These include ammonium nitrate, sodium chloride, ferric
chloride, sodium hypochlorite and sulfates.
4 Organic compounds
Withstands action by soaps, detergents, oils (animal,
vegetable, mineral), fats, greases, and waxes.
5 Solvents
Insoluble in all common alcohols, glycol and glycerine.
Not recommended for applications where chlorinated
hydrocarbons, esters, ketones and similar solvents are
present.
6 Petroleum products
Suitable for use where petrol, diesel oil, and crude oil
are encountered intermittently as in sewers.
7 Chlorine
Resistant to chlorinated water and sewage. Direct
exposure to chlorine gas may cause deterioration.
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