Walk into any farm supply store and the greenhouse covering options look almost identical. Clear sheets, rolled up, sold by the metre.
They are not the same thing. The base polymer changes how long the cover lasts, how much light reaches your plants, and how warm the house stays at night. So the honest answer to what type of plastic is best for greenhouses starts with another question: what are you growing, and how long must the cover last?
Flexible Films
Films cover the large majority of greenhouses worldwide, and among greenhouse uv plastic materials they are the most widely used by a wide margin. They are light, cheap per square metre, and easy to replace.
Polyethylene
Polyethylene, usually in its low-density or linear low-density form, is the default greenhouse film almost everywhere.
It is inexpensive, flexible enough to stretch over curved hoops without creasing, and light enough that the frame underneath can be modest.
Its weakness is sunlight itself. Raw polyethylene breaks down quickly under ultraviolet light, turning brittle and yellow within months. Every greenhouse film therefore carries stabiliser additives, and the quality of that package matters more than the polymer underneath.
EVA
EVA, short for ethylene vinyl acetate, behaves like a more refined cousin of polyethylene.
It stays flexible in cold weather, stretches further before tearing, and holds its clarity longer. Its most useful trait is heat retention. EVA blocks more of the long-wave infrared that escapes on clear nights, so the inside of the house cools down more slowly after sunset.
In highland growing areas where night temperatures drop sharply, that single property can be worth the extra cost. In hot lowland regions it matters far less, and may even work against you.
Multi-Layer Co-Extruded Films
Most quality greenhouse films sold today are not a single material at all. They are three or five layers bonded together during manufacture, each doing a different job.
The outer layer carries the heaviest UV protection because it takes the sun directly. A middle layer provides heat retention and strength. The inner layer carries the anti-condensation treatment, since that is where water forms.
This is why two films of identical thickness can behave completely differently. One may be a single plain layer, the other a carefully built sandwich.
Rigid Panels
Panels cost considerably more upfront but last far longer, so they suit permanent structures rather than seasonal ones.
Polycarbonate
Usually sold as twin-wall or multi-wall sheet with hollow channels running through it. Those channels trap air, making polycarbonate a genuine insulator rather than just a cover.
It resists impact remarkably well and lasts many years. The trade-offs are cost, weight, and a structure strong enough to carry it. The hollow channels also diffuse light rather than transmitting it clearly, usually an advantage for plants but it means you cannot see through it properly.
Acrylic
Acrylic transmits light better than almost anything else and barely yellows with age. It is also the most expensive option and more brittle than polycarbonate, cracking rather than flexing under impact. It appears mostly in display glasshouses and research facilities rather than production growing.
Rigid PVC
Still found on older structures, but it yellows and grows brittle faster than the alternatives and has largely been displaced by polycarbonate.
UV Resistant and UV Blocking Are Not the Same Thing
This confuses a lot of buyers, and the two terms sit right next to each other in product listings.
UV resistant describes the film protecting itself. Stabiliser additives absorb ultraviolet energy or interrupt the chain reaction it starts, so the film stays strong and clear for longer. This is about the life of the cover.
UV blocking describes the film protecting what is underneath. The film stops ultraviolet light from passing through to the plants and insects inside. This is about what happens in the growing space.
Blocking UV has real effects. Many pest insects, including whitefly, aphids and thrips, navigate partly by ultraviolet light, so a UV-opaque cover is harder for them to find and move around in. Some fungal pathogens also need UV to sporulate.
But it is not always desirable. Certain crops develop colour and flavour compounds in response to UV, and some pollinators rely on it. UV-blocking film is a deliberate choice for a specific crop, not a general upgrade.
Every greenhouse film should be UV resistant. Not every greenhouse film should be UV blocking.
What Makes Sense in a Tropical Climate
Near the equator, three conditions change the answer to what type of plastic is best for greenhouses.
Sunlight is intense year-round, so films age faster here than in temperate countries and the stabiliser package deserves more attention than it usually gets.
Heat is the constant problem rather than cold, so infrared heat-retention matters far less than ventilation and light diffusion. A film that scatters light reaches lower leaves and reduces scorching hot spots.
Humidity is high and rainfall heavy, so condensation on the inner surface is constant, and anti-drip treatment stops it forming droplets that fall onto leaves.
Choosing by Structure Life, Not by Price per Metre
For most growers, the practical answer to what type of plastic is best for greenhouses is a multi-layer polyethylene or EVA-blend film with a proper UV stabiliser package. It covers large areas affordably and can be replaced when it ages.
Rigid panels suit permanent buildings where the frame is already substantial and the cover will stay for a decade or more.
UV-stabilised greenhouse film is available from Urban Plastic, and it is worth talking through your structure type and expected replacement cycle before settling on a specification.
The mistake worth avoiding is comparing greenhouse uv plastic materials on price per square metre alone. A cheap film replaced yearly costs more over five years than a stabilised one lasting three, and every replacement interrupts a crop.
FAQ
What type of plastic is best for greenhouses?
For most growers, a multi-layer polyethylene or EVA-blend film with a proper UV stabiliser package. Rigid polycarbonate panels suit permanent structures where the frame can carry the weight.
What is the difference between UV resistant and UV blocking film?
UV resistant means the film protects itself from breaking down in sunlight. UV blocking means the film stops ultraviolet light reaching the plants and insects inside. Every greenhouse film should be UV resistant; only some crops benefit from UV blocking.
Is EVA better than polyethylene for greenhouses?
It depends on climate. EVA stays flexible longer and retains more night-time heat, which helps in cool highland areas. In hot lowland regions that heat retention is less useful and may be a disadvantage.
Why are greenhouse films made in several layers?
Because each layer does a different job. The outer layer carries UV protection, the middle layer adds strength and heat retention, and the inner layer carries the anti-condensation treatment where water actually forms.
Does blocking UV help with pest control?
It can. Whitefly, aphids and thrips navigate partly by ultraviolet light, so a UV-opaque cover makes the house harder for them to locate and move through. Some fungal pathogens also depend on UV to sporulate.
For more information about Greenhouse Plastic UV please contact: Whatsapp/Mobile Phone: +62 811 1721 338 (Ms. Ais) or Email : info@urbanplastic.id