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Polycarbonate vs Film Greenhouse - Sheet Comparison
Polycarbonate sheet greenhouse compared with film covers: longer life, lower heat loss and stronger impact and fire performance on a galvanized frame. .
TEL：+86 191 5068 3942
  • Features
Multi-span polycarbonate sheet greenhouse with exhaust fans on the gable and an external screen above
 
Steel truss and gutter structure inside a polycarbonate greenhouse with a service pipe
 

PC Sheet Against Film - What Changes:


PC sun board greenhouses are the advanced end of commercial greenhouse building. The material appeared in Europe in the 1970s and came into wide use in greenhouse construction as the fourth generation of covering after glass and film. PC board is usually a double or triple hollow transparent plate, or a single wave plate, and it holds high light transmittance, good sealing, good impact strength and good insulation, which is why it is judged the best overall performance of all the covering materials. It can be used in every greenhouse class and is not restricted by region; the only drawback is that the price is more expensive. The two covers are compared below, and the comparisons run through the lifetime of the house rather than only the first invoice, which is where the section on the PC sheet greenhouse range starts.


Life and Appearance:


A PC board house looks the better of the two and lasts far longer. The plastic film used on a film house has to be replaced roughly every two years, which means the cost and the labour come back again and again across the life of the structure. On a PC sheet house the covering is part of the building rather than a consumable, so the same money is spent once.

Heat Loss and Energy Use:


The thermal conductivity (K value) of plastic film is far higher than that of PC board, so a film house loses heat much more easily and the heating bill reflects it. Holding the heat in is a large part of what a covering is for, and the hollow structure of the sheet is what gives it that advantage.

Impact and Fire Performance:


On impact the difference is obvious: PC sheet carries the reputation of no broken glass, and because it does not go cold crisp at minus 100 degrees Celsius and does not soften at 135 degrees Celsius it keeps that performance across a wide temperature range. On fire, the sheet is tested to Class B with self-extinguishing behaviour, it does not produce toxic gases and it does not let the fire spread; burning plastic film on the other hand is a well known cause of serious loss. Taken together, this is why the glass houses, film houses and PC houses in our range are specified against the crop and the site rather than by habit.
 

Conclusion and Why us:


Through the comparison above, the PC board greenhouse is the better fit for vegetable production than a traditional plastic film house, and it is the cover that will take over more of that ground in the future. The houses are produced in our own plant, with 35 years of professional greenhouse production history, an in-house engineer department that can send engineers abroad to guide installation when a customer asks, and many years of supply to growers and project contractors across Africa, South Asia, the Middle East and Latin America. Many customers visit the factory each year for business cooperation. Read our factory page or the systems that go inside the house in greenhouse equipment. If you want to know more, please send an E-mail to sales@cngreenhouses.com, or call +86 191 5068 3942.

Reference material on covering materials is published by organisations such as the FAO, and commercial horticultural practice is reported by trade media such as HortiDaily.
 

Frequently Asked Questions:

Q: How long have you been manufacturing greenhouses?
A: Over 35 years. We design and produce greenhouses in our own factory and export to more than 32 countries, including Russia, the UAE, Kuwait, Canada, Chile and South Africa.
Q: How are the greenhouses packed for shipping?
A: Every shipment contains three parts: the metal structures, the covering system, and the installation accessories. All parts are packed for container shipping and arrive ready for assembly on site.
Q: How long does production take after payment?
A: Around 1 month after we receive the deposit. Every greenhouse is custom-built, so the exact schedule is confirmed when the order is placed.
Q: How often does a film cover need replacing?
A: A plastic film cover takes about two years to replace, and the cost and the labour come back with each change. That cycle is one of the main reasons growers move to a PC sheet cover.
Q: Does the PC sheet crack in cold or soften in heat?
A: No. The PC sun board does not go cold crisp at minus 100 degrees Celsius and it does not soften at 135 degrees Celsius, so it holds its impact resistance across a very wide temperature range.
Q: How does the sheet behave in a fire?
A: The PC sun board flame belongs to Class B with self-extinguishing behaviour. It does not produce toxic gases and does not let the fire spread, unlike a plastic film cover, which burns.

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