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среда, 12 апреля 2017 г.

Types of building materials and solar greenhouses for growing vegetables.



- Acrylic is resistant to weathering, does not break easily and is very transparent. Radiation absorption rate is higher than the glass; almost double acrylic sheet transmits 83% of light and reduce the amount of heat lost only 20-40%. The material does not yellow. The downside is that is that it can catch fire, is expensive and is easily scratched.
- Polycarbonate better withstand impact and is more flexible, easier and cheaper than acrylic. Double polycarbonate sheets transmit about 75-80% of the light and reduce heat loss to 40%. The material scratches easily, has a high rate of contraction in about a year begins to turn yellow and lose its transparency.
- panels of polyester fiberglass are durable, look good and have a moderate price. Compared with glass panels are more resistant to impact and send a little less light; while turn yellow.
- polyethylene panels are very cheap but can be used only temporarily, it does not look very well and have maintained more carefully than others. It is quickly destroyed by the sun's ultraviolet rays; if treated with special substances lasts 12-24 months longer than untreated ones.
- polyvinyl have a very high rate of emission of radiation and thus increase the temperature in the greenhouse during the night. It is more expensive than polyethylene and tends to accumulate dust.

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