Last season I walked a tomato block where the grower had just swapped tarps for a net for farming made from UV-stabilized HDPE. The difference? Cooler canopy, fewer sunburned fruits, and—he swears—less thrips pressure on the edges. To be honest, shade isn’t just about comfort; it’s a crop insurance policy when the mercury spikes.
Heatwaves are arriving earlier; water stress is persistent. Many customers say 30–60% shade is now their default for nurseries, with vegetable growers moving to seasonal 40–50% and fruit orchards testing perimeter windbreaks. Surprisingly, aquaculture and livestock yards are catching up, using knitted cloth for microclimate control and to reduce heat-stress mortality. Smart houses are pairing sensors with motorized spans, but simple fixed spans still dominate because they just work.
Origin: China. Material: knitted high-density polyethylene (HDPE) with UV stabilizers.
| Construction | Raschel warp-knitted, lightweight yet tear-resistant |
| Shade rate options | 30%, 40%, 50%, 60%, 70%, 80% (±5% real-world) |
| GSM (areal density) | ≈ 55–180 g/m² depending on shade rate |
| Width × length | Up to 8 m width seamless; roll length 50–200 m |
| UV package | HALS-based, ISO 4892-3 tested, ≈ 16–20 kLy rating |
| Tensile strength | ASTM D5035: ≈ 350–700 N (strip method, varies by GSM) |
| Edge finishing | Selvage or reinforced hems; eyelets optional |
| Color | Black, green, white, or bi-color (diffuse options) |
| Expected service life | 5–8 years temperate; 3–5 years tropical sun (usage-dependent) |
Virgin HDPE resin is blended with UV masterbatch and pigment, extruded into tapes/monofilaments, then warp-knitted on Raschel machines. Knitting density controls shade rate and airflow. Post-knit, rolls are relaxed, trimmed, and optionally hemmed with eyelets. QC pulls samples for tensile (ASTM D5035), UV weathering (ISO 4892-3), dimensional stability, and optical shade (per AS 4174 guidance). Real-world use may vary, but good UV packages resist embrittlement and chalking.
| Vendor | UV/Standards | Shade range | Lead time | Certs | Indicative price |
|---|---|---|---|---|---|
| YJ Wire Mesh (China) | ISO 4892-3, ASTM D5035 reports | 30–80% | 10–20 days | ISO 9001, REACH/RoHS (on request) | ≈ $0.18–0.45/m² |
| Local Importer | Basic UV claim, limited data | 40–70% | Stock/2–4 days | Varies | ≈ $0.30–0.65/m² |
| Marketplace Brand | Unknown UV package | 30–60% | 7–15 days | — | ≈ $0.15–0.35/m² |
If you plan multi-season use, insist on UV test data and shade-rate certificates. It seems obvious, but many budgets forget the sun is the real buyer here.
Customer feedback: “Feels thicker than last season’s roll,” one berry grower told me; another noted a 20–30% drop in irrigation frequency during hot spells.
Spain, strawberries: 50% shade reduced fruit sunburn and lifted marketable yield by ≈12% over 9 weeks. Mexico, tomatoes: sidewall spans cut edge scorch and improved uniformity; brix held steady. Coastal shrimp ponds: partial cover lowered water temps ≈2°C midday, improving survival through a heat spike. Not lab-perfect, but real farms, real gains.
Bottom line: a good net for farming isn’t flashy—it’s reliable microclimate control. With the right UV package and honest specs, it will outlast two or three cheap rolls and protect your margins along the way. If you’re unsure, start with one bay, measure canopy temps, and scale—simple.
Standards & refs