Rigid Plastic Sheets in Greenhouses

Acrylic Structural Sheet

• Provides additional thermal insulation due to its internal rib and two surfaces
• Available in various thicknesses and sizes up to 1.2m x 12m

Polycarbonate Structured Sheet

• Offers high impact strength, approximately 200 times that of glass
• Has a life span of 10-15 years, despite a higher initial cost
• Less light transmission compared to acrylic, but is more flexible and stronger
• Resistant to flammability, except when an active flame is maintained in contact

Fiberglass Reinforced Plastic (FRP)

• Available in large corrugated sheets and various thicknesses
• Requires recoating every 5-6 years to maintain high light transmittance due to surface erosion

Polyethylene Film

• LDPE film is the most common covering material due to its low cost and large sheet size
• Ultraviolet stabilized films have a 2-3 year life span, reduce heat loss, and are stronger
• Can be used in a double layer for added benefits

Greenhouse PE Film

Characteristics

• Good transparency, thermal insulation, aging resistance, and long service life
• Excellent weather resistance, tear resistance, and ease of installation and maintenance

Advantages

• Ensures sufficient sunlight and promotes plant growth
• Reduces heat loss and maintains optimal temperatures
• Long-lasting and reduces the frequency of replacement
• Withstands external forces and ensures film integrity

Colors and Thickness

• Available in White, Blue, and Transparent colors
• Thickness ranges from 0.08mm to 0.2mm

Life Span

• Can last for 3-5 years

Polyvinyl Fluoride Film (PVF)

• Structurally similar to polyvinyl chloride (PVC) with a fluorine atom instead of chlorine
• Offers high light transmission and strength
• Long-life film suitable for use over aluminum extruded or steel frames

Comparison of acrylic and polycarbonate structural sheets used in greenhouses, highlighting their thermal insulation, size, and physical properties.