What is Polycarbonate?
Polycarbonate is a strong, transparent plastic material known for its durability and resistance to impact. In the context of home & garden items like greenhouses and cold frames, it’s frequently used as a glazing – meaning it forms the clear panels that let in light. It's significantly tougher than standard glass, offering better protection against accidental damage or weather conditions. Polycarbonate is also lighter than glass, which can make installation easier, though it may be more expensive upfront. Maintaining polycarbonate requires regular cleaning to remove dirt and debris for optimal light transmission.
Polycarbonate’s strength stems from its molecular structure – it's a thermoplastic polymer known for exceptional impact resistance, far exceeding that of standard glass. This makes it an ideal choice for UK gardens where weather conditions can be particularly harsh; polycarbonate panels are often deployed in greenhouses and cold frames to withstand strong winds, heavy rain, and even hail. The specific thickness of polycarbonate sheets varies considerably; you'll typically find gauges ranging from 4mm to 10mm, with 6mm being a common size for smaller structures. Thicker panels offer greater structural rigidity and improved insulation, but also increase the cost.
When selecting polycarbonate, pay attention to UV resistance – prolonged exposure to the sun can degrade the material over time, causing it to become brittle and yellow. Look for products labelled ‘UV stabilised’ or with a high UVF (Ultraviolet Protection Factor) rating; ideally above 80%. A common mistake is assuming all polycarbonate is created equal; different manufacturers use varying additives. Measuring accurately before purchase is vital – polycarbonate sheets are typically measured in length and width, but consider the curve of the sheet if it's designed for a specific frame. Furthermore, ensure you have appropriate sealant to create a weatherproof seal when joining panels, as polycarbonate can be prone to cracking if improperly sealed.
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FAQ
What does UVF (Ultraviolet Protection Factor) mean?
UVF measures the level of protection a polycarbonate sheet provides against harmful ultraviolet radiation from the sun. A higher UVF rating – typically 80 or above – indicates significantly reduced degradation and yellowing over time, crucial for UK gardens with intense sunlight.
How does polycarbonate compare to glass?
Polycarbonate is roughly half the weight of equivalent-strength glass and offers superior impact resistance. However, glass generally has better thermal insulation properties than polycarbonate, although high-quality polycarbonate panels can still provide good insulation – consider this when selecting a glazing material.
What should I check when buying polycarbonate sheets?
Always verify the UVF rating; look for panels specifically designed for outdoor use. Also, examine the thickness and ensure it matches your structural requirements and the dimensions of your frame to avoid costly mistakes during installation.
Is polycarbonate prone to cracking?
While incredibly impact-resistant, polycarbonate can crack under extreme force or if subjected to sudden temperature changes. Proper installation with appropriate sealant is vital to prevent this; ensure panels are securely fastened and the joint is weatherproofed thoroughly.
How does the thickness of polycarbonate affect its performance?
Thicker sheets offer greater structural integrity and improved insulation, but also increase cost and weight. 6mm is a common general-purpose thickness for greenhouses, while 8mm or 10mm might be preferable for larger structures or regions with harsher weather.
What type of sealant should I use?
Specifically formulated silicone sealants are recommended for bonding polycarbonate sheets. Avoid using standard PVC sealants as they won’t provide the necessary adhesion and UV protection, leading to potential cracking at the joints.
Can I drill polycarbonate?
Yes, but it's crucial to use a slow-speed drill with a sharp blade designed for plastics – otherwise, you risk melting or cracking the material. Always wear eye protection when drilling polycarbonate to prevent plastic dust from entering your eyes.
What does ‘multiwall’ polycarbonate mean?
Multiwall polycarbonate consists of several layers of polycarbonate separated by air gaps, significantly improving insulation performance and reducing noise transmission – this is especially beneficial in colder climates or areas with high wind noise.
Is polycarbonate more expensive than glass?
Initially, yes, polycarbonate tends to be more expensive than standard glass due to its superior properties. However, consider the long-term cost savings from reduced maintenance, increased durability, and potentially lower energy bills (due to better insulation).
What is the difference between PC and BC Polycarbonate?
BC (Birefringent) polycarbonate has a textured surface that reduces reflections within the panel, improving light transmission – this can be particularly noticeable in areas with limited sunlight. PC (Clear) polycarbonate is standard and offers excellent clarity without this reflective effect.