| ¡@ What is the temperature
limit on Corzan® CPVC on a cost basis?
The upper temperature limit on Corzan® CPVC is 200¢XF. There is no
lower temperature limit on Corzan® CPVC and the material will withstand pressure. At
very cold temperatures the material will become brittle and the impact strength will
decline.
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How much more is Corzan®
CPVC than PVC on a cost basis?
Corzan CPVC is more expensive than PVC on a per foot basis but the
material is much capable of handling higher temperatures than PVC, thus the higher price
per pound of material provides a significant value in demanding high temperature
applications.
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What is the difference between
Corzan® CPVC and PVC?
The maximum process temperatures are as follows: PVC max. Temp = 140¢XF
CPVC max. Temp = 200¢XF PVC has a crystalline structure thus enabling it to be made into
flexible material. CPVC does has a more rigid chain due to the additional chlorine atoms
attached to the PVC chain and thus is a more brittle material. The difference in chemical
structure of CPVC allows it to have a higher temperature resistance. In terms of chemical
resistance the two are very similar.
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What is the difference between
Corzan® CPVC and CPVC?
There is some difference between regular CPVC and Corzan® CPVC.
Corzan® CPVC is the result of further development of CPVC. Corzan® CPVC has better
impact strength and better process capabilities than normal CPVC products. It is also a
slightly more expensive than CPVC and only licensed manufacturers are capable of making
the product. A licensing agreement with Noveon is a commitment to specify Corzan® CPVC
while Noveon will make efforts to provide a continually better product than normal CPVC in
addition to the support of the marketing arm and the technical service group.
As an offshoot of the Corzan licensing program, a Quality of Pipe program
is in place to ensure high quality standards. These standards are above the ASTM
requirements for plastic pipe and substantiate the quality of Corzan® CPVC products.
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Can Corzan® CPVC handle
this chemical?
Corzan® CPVC is compatible with most mineral acids, bases, salts and
aliphatic hydrocarbons. It is a much more suitable material than other non-metals in these
environments. Many factors affect chemical resistance such as concentration, temperature,
pressure, external stress and product quality. Due to the large number of variables,
material suitability is often based on in-service testing.
Click below for more detailed information on Chemical
Resistance.
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Can Corzan® CPVC handle
this pressure?
Corzan® CPVC is pressure rated. There is a list of pressure ratings
for the different sizes of pipe in the Engineering Design Manual. The ratings apply to a
fluid temperature of 73¢XF. At higher temperatures there are derating factors to specify
new working pressures. There are maximum working pressure curves in the EDM on page 4.3.2.
For more information on the physical properties or to receive a copy of
the Engineering Design Manual please contact us.
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What about cold temperatures?
Cold temperatures do not affect the pressure rating of the Corzan®
CPVC, though it will make the Corzan more brittle. Therefore, in a cold environment
Corzan® CPVC loses its impact strength slightly.
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What does sunlight do to
Corzan® CPVC?
The UV exposure will reduce the impact strength of the material. The
tensile strength and the pressure handling capability of the pipe is not affected by the
exposure to ultraviolet light. To combat the effect of ultraviolet rays, Corzan® CPVC
has been blended with a significant amount of TiO2. TiO2 is well recognized as a well
known ultraviolet blocking agent and helps to protect the polymer backbone. In addition,
Common acrylic latex paint can act as a defense against the degradation of Corzan®
CPVC in UV.
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How do you put this together?
Solvent cement is one of the three methods to put two sections of
Corzan® CPVC pipe together. This is a two step process with a primer and a solvent
cement. The solvent cement is recommended for all the conditions of the Corzan® CPVC
system.
Flanging is another means of joining Corzan® CPVC pipe and is used
generally when temporary disassembly is required. Flanging requires a gasket which will be
chemically resistant to the process fluids.
Threading on schedule 80 pipe up to 4 inches in diameter is a third method
of joining Corzan® CPVC. Threading is acceptable only in cases where the system will
operate under 130¢XF.
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What sizes does this come in?
Corzan® CPVC comes in 1/4 inch through 12 inch for schedule 40 and 80
pipes and 6 inch through 24 inch for duct piping larger duct sizes can be made from sheet
material.
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What is the flame and smoke
rating?
Corzan® CPVC has outstanding fire and smoke performance. Corzan®
CPVC has a flash ignition temperature of 900¢XF which is the lowest temperature at which
the Corzan® CPVC will catch fire. Additionally, the limiting oxygen index for
Corzan® CPVC is 60%, meaning the Corzan® CPVC material will sTop burning unless
the oxygen level of the air around it contains 60% oxygen. This being unlikely,
Corzan® CPVC will sTop burning unless a flame is constantly applied to it. Corzan®
CPVC also generates little smoke. Both the flame spread and the smoke generation were
tested by the SWRI (South West Research Institute) and the results are as follows:
| ¡@ |
Flame Spread |
Smoke Developed |
| Requirement |
25 or less |
450 or less |
| Results (material 0.031"-0.064" thick) |
15 |
70-125 |
Recently Noveon developed a new product which has been approved by Factory
Mutual for use in the construction of cleanroom equipment for the semiconductor industry.
FMRC 4910 is a new requirement established by Factory Mutual for cleanroom construction
materials which will limit the damage to chip manufacturing facilities in the
semiconductor industry.
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