- info@infunplastic.com
- +86-18530860523
- Zhoukou city, Henan province, China
Two rolls of “200 micron film” can perform nothing alike. Quality is engineered in the extrusion line — resin grade, co-extrusion, and an honest UV package. Here’s how to verify what you’re actually buying.
Quality is engineered in the extrusion line, not added at the label printer. These five factors decide how a roll performs in the field.
Virgin, branded resin gives consistent strength and clarity; reprocessed resin degrades both.
3–5 layer films keep UV and additive layers protected; single-layer blends wear out faster.
The type and loading of UV stabilizers sets real service life in sun.
Even mixing of anti-drip/anti-fog prevents patchy performance.
Variation across the roll creates weak points that tear first.
Stated tolerance and UV life backed by test data — not just a number on the roll.
What “good” looks like on paper. Use this as the benchmark when you read a supplier’s data sheet.
| Tensile strength (MD / TD) | high & balanced |
| Elongation at break | absorbs wind load |
| Light transmission | 88–93% |
| Haze / diffusion | stated per crop |
| Thickness tolerance | ±5% max |
| UV life claim | test-backed |
Values measured per EN 17033 / ISO 4892. Your target spec may differ — tell us your crop and climate and we’ll tune the formula and send a lot-specific COA.
You do not need a lab to catch bad film. A few field checks go a long way before a roll goes up.
Measure at several points across the roll width; reject if outside ±5% of spec.
Cut a strip and pull; it should stretch and resist, not snap immediately.
A handheld PAR/lux meter through the film vs ambient gives a quick read.
Even clarity, no streaking, no gel spots, no odour (odour suggests contaminated resin).
Confirm against order; short-rolling is a common cheat.
Require certificates on file before a large order, not after a failure shows up mid-season.
Third-party confirmation of material and physical properties — not a self-declaration.
Consistent manufacturing process control, batch after batch.
Proves biodegradable mulch genuinely composts in soil — not a marketing claim.
Know what bad film looks like so you can refuse it at the gate, not at harvest.
| Defect | Cause | Risk |
|---|---|---|
| Thickness variation | Poor extrusion control | Early tears at thin points |
| Gel / fish-eye spots | Contaminated resin | Weak spots, light blockage |
| Strong plastic odour | Recycled / off-spec resin | Short life, crop-safety concern |
| Streaky clarity | Bad additive mixing | Uneven light, patchy growth |
| False UV claim | No / too little stabilizer | Chalks and embrittles in one season |
Send this list with your PO. It separates serious manufacturers from traders.
Check resin grade, co-extrusion layers (3–5), UV stabilization with test data, and thickness tolerance (±5%). Verify on arrival with a thickness gauge and a tensile strip.
SGS for independent property verification, ISO 9001 for process control, and EN 17033 specifically for biodegradable mulch film.
Not always, but very cheap film usually cuts resin grade or UV loading. Judge by stated specs and certificates, not price alone.
It builds the film in separate layers so UV and additive packages are protected inside, extending functional life versus a single blended layer.
Use a micrometer or thickness gauge at multiple points across the roll width. Reject if readings vary more than ±5% from the spec.
A strong odour often indicates reprocessed or off-spec resin, which shortens life and can be a crop-safety concern. Quality virgin-resin film has little to no odour.
“We now require SGS and a thickness gauge on every incoming roll. The bad batches stopped arriving, and mid-season failures dropped to near zero.”
Send us your crop, climate and required certificates — we’ll quote film with stated tolerance and a lot-specific COA.
Agricultural Film Supplier
