What buyers asking for an "Anhui shade net factory" are actually asking
The r/manufacturing buyer looking for a shade net factory in Anhui is usually making a geography request, but the underlying need is a material-grade request — in plain terms, "I don't want the sample to look fine and the production batch to fail in the sun." Shade net is HDPE monofilament knitted on warp-knit machines. A factory in Anhui can output anywhere from 50 g/m² (light agricultural shade) to 200 g/m² (heavy construction screening). The price ranges 4x across that spectrum, and the visual difference between a 3-year UV-stabilised net and a 1-year unstabilised net is almost zero at delivery.
The Suzhou-Anhui confusion is the first filter. Most international buyers searching "Suzhou shade net" land on factories near Shanghai (Jiangsu province), which is a different cluster. Anhui's Suzhou (宿州) is in the north of the province, near Henan. Hefei and Bozhou also produce shade net.
The three specs that actually determine the product
| Spec | Range | What it controls |
|---|---|---|
| Shade ratio | 30% / 50% / 70% / 90% | Application — 30–50% for greenhouse, 70% for general agriculture, 90% for construction screening or carparks |
| GSM (weight) | 50–200 g/m² | Durability and tear resistance; light agriculture nets sit at 50–80 g/m², heavy-duty at 140–200 g/m² |
| UV stabiliser | None / 3-year / 5-year | Expected service-life positioning under sun; often expressed by suppliers as kly (kilolangley) UV exposure rating |
A factory quote of "70% shade cloth, $0.18/m²" leaves all three open. A quote of "70% shade, 140 GSM, 5-year UV-stabilised HV2700 grade HDPE, virgin resin" is a specification.
Virgin vs recycled HDPE — the field signal
Recycled HDPE shade net can cost roughly 25–35% less at the factory gate, and buyers often report materially shorter outdoor life under direct sun. Two field signals:
- Colour uniformity — virgin HDPE with a single masterbatch colour run is often more uniform; recycled HDPE may show tonal variation along the monofilament because the input pellets came from mixed sources.
- Tensile retention after 12 months — as a practitioner-reported rule of thumb, virgin UV-stabilised net often retains tensile strength better over one season than recycled-resin equivalents, but exact retention depends on additive package, GSM, climate, and installation conditions.
The factory will not always volunteer which feedstock the order will run on. In Octo methodology, the supply contract should specify "100% virgin HDPE resin" by name, and one practical screening step is a burn test on the sample.
The burn test — what UV stabiliser looks like under flame
The burn test is a practitioner screen, not a lab identification method, and results should be treated as directional rather than conclusive.
A small piece of shade net held to a flame can produce indicative results:
| Observation | What it indicates |
|---|---|
| Black smoke, drips clear molten polymer, smells like wax | Consistent with HDPE; may indicate cleaner material, but not proof of virgin resin or absence of UV stabiliser |
| Burns slower, leaves a fine grey-white ash residue on the drip | May indicate additive presence, including some UV-stabiliser packages, but not a definitive HALS confirmation |
| Burns fast, black smoke, drips dark molten material, acrid smell | Can be consistent with recycled HDPE or contamination |
| Self-extinguishing or chars without dripping | May indicate a non-HDPE material or blend |
The burn test is not a lab method, but it is a 30-second filter that can help separate cleaner-looking HDPE samples from the cheapest grade. A factory confident in its material will usually not object to a burn test being performed on the sample in front of them.
The 3-Consistency Rule applied to shade net suppliers
Octo's 3-Consistency Rule: *"A Chinese manufacturer is not verified until its legal entity (SAMR), export record (HS codes), and production capability (factory visit + sample test) tell the same story."*
Check 1: SAMR business scope
Search the supplier on qyj.samr.gov.cn. For a shade net factory, the business scope (经营范围) should include one of:
- 塑料制品 (plastic products) — the broad category
- 塑料制品制造 (plastic products manufacturing) — manufacturing verb attached
- 农业生产资料 (agricultural production materials) — for factories selling into agricultural supply chains
- 遮阳网 / 遮光网 (shade net specifically) — when the factory is specialised
A scope showing only 销售 (sales) or 农资批发 (agricultural materials wholesale) more often describes a distributor or trader than a factory.
Check 2: Export record — HS code 6005.39
Shade net exports often fall under:
- 6005.39 — warp-knit fabrics of synthetic fibre, not bleached or dyed; a common HS heading used for knitted shade net.
- 6005.36 / 6005.37 — same warp-knit category, bleached or dyed variants.
- 3926.90 — sometimes used for plastic netting classified as "articles of plastic" rather than textile.
A supplier claiming export of shade net should ideally show shipment history under 6005.39 (or 3926.90 for some markets). Suppliers exporting under 6306 (tarpaulins) or 5407 (woven synthetic) may be in adjacent categories rather than the warp-knit shade-net segment.
Check 3: Production capability — warp-knit machines and feedstock
A real shade net factory runs warp-knit Raschel machines (commonly Karl Mayer or Chinese-built equivalents). Capability questions:
- How many warp-knit machines, and what working width? (Standard widths: 2m, 3m, 4m, 6m.)
- Single resin source or mixed? (Single-source virgin HDPE is the cleaner answer.)
- What UV-stabiliser additive and at what loading? (HALS at 0.3–0.6% by weight is often cited for 5-year-rated product.)
- In Octo methodology: place a sample order with explicit virgin-resin and UV-additive specification, then screen the received sample before scaling.
Red flags
- Quote names a shade percentage but no GSM and no UV rating
- Factory is in Jiangsu's Suzhou but advertises as "Anhui" — different province, different cluster
- SAMR scope shows only 农资批发 (agricultural materials wholesale), no manufacturing verb
- Refusal to specify "virgin HDPE" on the supply contract
- "5-year UV" claim with no HALS additive named and no loading percentage
- Sample passes burn test but production batch differs — confirm sample retention practice and batch testing on arrival
What Octo SAM does here
Octo SAM verifies Anhui (and adjacent Henan / Shandong) shade net factories on the full 3-Consistency stack: SAMR scope under 塑料制品制造 or 农业生产资料, customs cross-reference under commonly used HS headings such as 6005.39, and production capability — warp-knit machine count and width, virgin-resin sourcing documentation, UV-additive disclosure, and sample verification. For buyers running container-scale orders into agriculture, horticulture, or construction screening, we help confirm the producer entity and the claimed material grade before the PO ships.