Quality Control
Named resin suppliers, testing against EN and ASTM methods, and what we will tell you when something goes wrong.
Sheet quality is decided long before anyone measures the finished product. It is decided by what goes into the extruder.
We buy virgin polycarbonate granules from Covestro, SABIC and Mitsubishi Chemical under long-term agreements. Standard production contains no recycled or reprocessed feedstock. This is the most expensive decision we make and the one that matters most.
Why recycled content is the industry’s quiet problem
Reprocessed polycarbonate is cheaper, and a sheet made from it looks identical on the day it arrives. The difference shows up two or three years later as yellowing, falling light transmission and brittleness — long after the invoice was settled and usually after the installer has moved on.
Our sheet is specified to retain ≥ 85% light transmission after ten years. That figure is only achievable with virgin resin.
What we control and test
| Stage | Control |
|---|---|
| Incoming resin | Supplier certification, batch traceability |
| Extrusion | Continuous line monitoring, thickness control |
| Dimensional | Checked against the order specification |
| Optical | Light transmission and haze on production samples |
| Mechanical | Impact testing to internal standards |
| Environmental | Verified stable −40 °C to 120 °C by national testing |
| Machining | ±0.1 mm on CNC operations |
Our internal technical standards for optical performance, impact strength and weathering are aligned to EN and ASTM test methods, developed by our in-house research institute — six PhDs and 23 core patents.
When something goes wrong
It occasionally does. What we ask is photographs of the material and the installation, the batch information from the packaging, and the service conditions.
Most field failures we investigate turn out to be installation issues — UV face installed downwards, ribs run across the slope, fixings over-tightened with no allowance for thermal movement, or an incompatible cleaning chemical. We will tell you when that is the case, with the evidence, and we will tell you equally plainly when the sheet was at fault.
Minimum order and lead time
This grade ships from 100 m² or 1 tonne — a trial pallet, not a full container. Standard sizes and stock colours run in 7–10 days; non-standard thickness or width in 12–18 days; add 3–7 days for CNC cut-to-size work. Quoted in USD on FOB, CIF or DDP terms. Full detail on the MOQ, lead time & shipping page.
Questions buyers ask
Can you provide material certificates?
Yes — resin supplier certification and batch traceability for the material supplied. Tell us at order stage if your customer requires documentation, so it travels with the shipment.
Do you test to EN or ASTM standards?
Our internal standards for optical, impact and weathering performance are aligned to EN and ASTM methods. For a specific certified test against a named standard, tell us which one and we will confirm what we can provide before you order.
How do I verify the sheet is virgin material?
Ask for a sample and compare it edge-on against sheet from another supplier. Recycled content shows as a grey-yellow cast in the edge, which is the hardest place to hide it.