UV Requirements by Netting Product Type: A Buyer’s Map

Editor’s Note: This article is part of our UV Stabilizers for Agricultural Plastics Guide. Visit the Hub for the full breakdown of UV ratings, stabilizer chemistry, supplier verification, and product selection.

UV requirements rise with sun exposure and how permanently the net stays up. Insect netting (often under cover) needs roughly 360–540 KLY, shade cloth in direct sun 360–720 KLY, vineyard netting 720+ KLY, and permanent overhead hail netting the most at 720–1080 KLY. The rule that connects them all: match the net’s rating to your regional UV load and its installation life, not to the lowest quote.

One UV grade does not fit every net, which is why we run different stabilizer packages across our lines. A net spends its life in a specific way — under glass, in full sun, up for one season or for a decade — and that pattern decides how much UV protection it actually needs. Here is how the requirement changes by product, with the relevant rating for each and where to go deeper for your crop.

Why does UV requirement differ by product type?

Two variables drive it: how much direct sun the net takes, and how long it stays installed. A net under a greenhouse roof sees filtered UV; a hail net on a permanent orchard structure takes the full dose for a decade. The longer and the more exposed, the higher the KLY rating it must carry to reach its rated life.

Insect netting: UV under cover

Insect netting often works under a greenhouse or shade structure, so its UV load is moderate — but fine mesh is unforgiving when it fails. A rating of 360–540 KLY suits most applications, with anti-aphid grades at the higher end. The failure mode that matters here is aperture drift: as UV embrittles the fine yarn, the mesh deforms and the openings change, letting target pests through even while the net looks intact.

This is also where thin yarn bites hardest — fine nets have the highest surface-area-to-volume ratio, so material quality matters even more than the rating. See our insect netting hub for mesh and crop selection, and the insect-proof netting product specs.

Shade cloth: the highest direct exposure

Shade cloth takes some of the most direct UV of any product because its whole job is to sit in full sun — so it needs 360–720 KLY depending on region and shade factor. Quality shade cloth using virgin HDPE plus a proper UV package holds its colour and shade percentage across years of continuous exposure; cheaper cloth fades and loses shade factor early, which changes the microclimate it was specced to create.

Reflective aluminised products add another consideration — the metallised surface and the polymer both have to survive UV. Explore shade applications by crop and the aluminet reflective shade range for specifics.

Vineyard netting: multi-year, localised intensity

Vineyard netting stays up across seasons and often sits in high-UV wine regions, so 720+ KLY is a sensible floor. Side and overhead bird/hail protection in vineyards combines multi-year installation with the intense sun of places like inland Australia, Chile and southern Europe — a demanding combination that punishes an under-rated net within a couple of seasons.

Because vineyard systems are an investment kept for years, the lifespan maths favours a higher rating up front. The vineyard netting hub covers configuration and crop-specific choices.

Hail netting: the maximum requirement

Permanent overhead hail netting carries the highest UV rating of all — 720–1080 KLY — because it stays up for a decade in full sun and its 8–12 year lifespan depends on that protection.^[1] This is the product where the rating most directly buys you years: a net that comes down each season for handling reasons drops to 5–7 years, while a permanent, correctly rated installation reaches the top of the range.

See the hail netting hub for structure and deployment, and the leno hail netting specs. Bird netting and windbreak sit between these cases — typically 360–540 KLY — driven by how exposed and how permanent the specific installation is.

How do you turn this into your own specification?

Combine two numbers: your regional annual UV load (KLY) and the product’s exposure-and-permanence profile, then specify a rating at or above that floor with headroom for permanent installs. A net rated for Central Europe (≈100 KLY annual) is under nearly double the dose in Australia or Chile, so the same product needs a higher grade there.

Then apply the material-first rule across every product type: the rating is a ceiling the stabilizer helps you reach, but thin yarn or recycled resin caps the real result no matter the grade. Compare grams per square metre and confirm virgin HDPE first. To set your regional number, see KLY by region; for what each grade delivers in years, the lifespan benchmarks; and for the full framework, the UV stabilizers hub.

Frequently Asked Questions

Do all agricultural nets need the same UV rating?

No. UV requirement scales with direct-sun exposure and installation life. Insect netting under cover may need 360–540 KLY, shade cloth in full sun 360–720, vineyard netting 720+, and permanent hail netting 720–1080. Matching the rating to the product’s exposure pattern and to your region is the whole point.

What KLY rating does insect netting actually need?

Most insect netting needs 360–540 KLY, with anti-aphid and fully exposed applications at the higher end. Because the yarn is fine, material quality matters as much as the rating — UV embrittlement causes aperture drift that lets pests through. Confirm virgin resin and adequate weight alongside the UV grade.

Why does hail netting need the highest UV rating?

Hail netting stays up permanently overhead in full sun and is expected to last 8–12 years. That combination of maximum exposure and longest life demands 720–1080 KLY. A net that’s taken down and rehung each season suffers handling damage on top of UV and lasts only 5–7 years.

Does shade cloth degrade faster than hail netting in the same climate?

For a given UV grade, shade cloth typically shows wear sooner because it’s built lighter and takes direct sun across its full surface. That’s why shade cloth and hail netting are rated and built differently. A quality shade cloth still lasts 5–7 years; the point is to rate each product for its own job rather than assume one grade covers both.

Can I use the same net for shade and for hail protection?

Not interchangeably. Shade cloth is engineered for light management and a specific shade factor; hail netting is engineered for impact resistance and permanent overhead life. Their UV packages, weights and structures differ. Specify each for its actual purpose, and match both to your regional UV load.

How does my region change the rating I need?

Significantly. High-UV regions such as Australia, Chile and the US Southwest deliver nearly double the annual UV of Central or Northern Europe, so the same product needs a higher KLY grade there. Set your regional KLY first, then choose a product rating at or above it, with headroom for permanent installations.

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References

1. Reviews of hail netting in apple orchards, MDPI Climate and Horticulturae (2025): UV-stabilized HDPE hail nets last ~8–10 years on permanent structures, dropping to 5–7 with repeated seasonal removal. mdpi.com
2. “The UV stability in agriculture nets explained” — virgin-HDPE shade cloth with UV inhibitors retains colour, shade factor and tensile strength across multiple years of continuous exposure. agrishade.com

By Kevin Lyu, Founder of EyouAgro. Since 1996 we have manufactured hail, shade, insect and vineyard netting on our own eight production lines in Shanghai — each with a UV package matched to its job — for growers across Australia, Chile, Spain and Europe.

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