HDPE net wrap is the material that holds a round bale together, and most guides stop at explaining what it is. The part that actually affects a farm day to day is different: how to use it well, how to get it off the bale safely, and what to do with it afterwards. Get those wrong and the consequences range from wasted feed to a dead animal. This guide covers the full working life of HDPE net wrap, from what it is through to how to dispose of it responsibly.
What HDPE Net Wrap Is
HDPE stands for High-Density Polyethylene, a plastic polymer produced from ethylene. Ethylene is a small hydrocarbon molecule, a monomer, and through a process called polymerization, many ethylene monomers are joined into the long polymer chains that make up polyethylene. HDPE is the higher-density, higher-strength member of the polyethylene family, which is exactly why it is chosen for net wrap: it delivers high strength at low weight.
That strength-to-weight balance is what makes net wrap possible at all. A single layer of thin mesh has to restrain a round bale that can weigh hundreds of kilograms and constantly pushes outward against its binding. Many people are surprised that something so light can hold something so heavy and dense, but that is precisely what good HDPE does.
If you want the detail on how the resin grade and manufacturing process affect quality, our guide on how net wrap manufacturers produce net wrap goes deeper. Here, the focus is on using it.
How HDPE Net Wrap Is Made, Briefly
The manufacturing runs through two stages. First, the HDPE resin is extruded into a wide, thin film and wound into a large primary roll. Second, that film is slit into narrow tapes, and those tapes are knitted on looms into the open mesh that gives net wrap its form. The knitting, not weaving, is what creates the characteristic net structure, and the finished product is supplied to farmers in large rolls sized to fit balers.
The mesh structure matters for understanding what net wrap does and does not do. Because it is an open mesh, it holds a bale in shape while letting air through. That makes it right for dry hay and straw. It also means net wrap does not seal a bale airtight, so it does not, on its own, make silage. Silage needs a solid, airtight film. On round bale silage, net wrap goes on first to hold the bale, and silage film is applied over it to create the oxygen seal.
What HDPE Net Wrap Is Used For
The core job is protecting and containing baled feed.
Net wrap holds a bale in a compact, stable shape so it does not lose its form during handling, stacking, and transport. Without it, or with a poor binding, bales shed material, which is direct feed loss, and they slump out of shape, which makes them harder to handle and store. A well-wrapped bale holds together from the field to the feed face.
It also protects the bale from the elements to a degree. It helps a round bale shed some rain because of its shape, resists the dust and contamination that downgrade feed, and denies rodents and birds the easy access they exploit on loose bales. For dry hay stored outdoors, this protection, combined with proper storage, keeps feed sound through months of storage.
What net wrap does not do is waterproof a bale. The mesh lets water through, so dry hay wrapped in net still needs dry, covered storage to stay in good condition. The wrap holds the bale; covered storage keeps the rain off the hay inside.
Using Net Wrap Well
A few practices separate net wrap that performs from net wrap that disappoints, and none of them are complicated.
- Match the width to your baler. The net must cover the full face of the bale, including the shoulders. Wrap that is too narrow leaves the bale ends exposed, which is where weather damage and material loss begin.
- Apply consistent tension. Even tension gives a firm, uniformly bound bale that holds its shape. Loose or uneven application produces a soft bale that slumps.
- Use enough layers for the job. More layers give better security and weather resistance at the cost of fewer bales per roll. For long outdoor storage or bales that will be transported and handled repeatedly, more layers pay off. For sheltered, short-term storage, fewer suffice.
- Store spare rolls out of the sun. Even UV-stabilized net degrades if rolls sit in direct sunlight for long periods before use. Keep them cool, dry, and shaded.
- Store finished bales on a clean surface. Stubble, stones, and debris puncture and tear net from below. A flat, clear storage area prevents many seal and tear failures.
“Most of what determines whether net wrap performs happens at the two ends: putting it on and taking it off. Buyers focus on the roll, but the width matching, the tension, and above all the removal are where the real outcomes are decided. We spend as much time advising farmers on getting the wrap off safely as on which product to buy, because that is where the animal safety issue lives.
— Sue Su, Marketing Director of Silopak
The Critical Part: Removing Net Wrap Before Feeding
This is the section that matters most, because getting it wrong can kill an animal.
HDPE net wrap does not break down in a cow’s digestive system. Research has repeatedly shown that plastic net wrap placed in the rumen does not diminish at all, even over weeks, while hay in the same environment is almost fully digested. When cattle consume net wrap, whether by accident or because it was left on a bale that got ground into a ration, it accumulates in the rumen. Over time it can form a solid mass that reduces the animal’s functional stomach capacity, causing the animal to eat less, lose weight, and in severe cases develop a fatal digestive blockage.
The rule that follows is simple and absolute: all net wrap must be removed from every bale before feeding. Not most of it. All of it.
How to remove net wrap safely
The goal is to get the net off in one piece, without leaving fragments behind that an animal might eat. A practical method:
- Position the bale so the wrap is accessible. For a round bale, lay it so you can rotate it or reach around it.
- Cut the net cleanly along the length of the bale with a knife or blade, cutting through all layers in one line rather than tearing at it. Tearing is what leaves fragments.
- Peel the net off as a single sheet, rotating the bale so the wrap comes away in one continuous piece rather than breaking up.
- Check the bale surface for any clinging pieces of net and remove them, since small fragments are the ones most easily eaten unnoticed.
- Collect the removed net immediately and put it somewhere animals cannot reach it. Net left lying in the feeding area gets eaten out of boredom.
If you grind bales for a mixed ration, the wrap absolutely must come off before the bale goes into the grinder. Grinding does not solve the problem, it makes it worse, chopping the net into small fragments that cattle consume readily and that still cannot be digested. Surveys have found that far fewer farmers remove wrap before grinding than before feeding whole bales, and that gap is exactly where much of the harm occurs.
Disposing of HDPE Net Wrap Responsibly
Once removed, the net has to go somewhere, and how you handle it matters for animals, people, and the environment.
Keep it away from animals and machinery
Used net wrap left lying around is a hazard. Animals eat it. It tangles in machinery. Blown into fields, it contaminates future forage. The first rule of disposal is containment: collect used wrap into a bag or bin as it comes off, rather than letting it pile loose.
Recycle where you can
HDPE is recyclable in principle, and in a growing number of regions organized agricultural plastic recycling schemes exist specifically for used net wrap and silage film. Recycling works best when the wrap is kept reasonably clean and dry and separated from other waste. Check whether a collection scheme operates in your area, since using it is usually easier and cheaper than farmers expect, and it is becoming the expected practice as agricultural plastic regulation tightens.
Do not burn it
Burning agricultural plastic releases harmful smoke and is increasingly restricted or prohibited. It is neither a safe nor, in many places, a legal disposal method. Burying it is little better, since HDPE persists in the ground for a very long time.
The quality connection
There is a link between wrap quality and disposal burden worth noting. Poor-quality net wrap degrades and fragments during use, scattering small pieces across fields that are almost impossible to collect. Durable, quality net wrap comes off in one piece and can be collected and recycled cleanly. Buying a wrap that holds together is therefore an environmental decision as well as a performance one.
Choosing Quality HDPE Net Wrap
To pull the practical points together, the net wrap that performs well through its whole working life shares a few characteristics.
| Quality Marker | Why It Matters |
|---|---|
| Virgin HDPE resin | Consistent strength; recycled blends tear and fragment |
| UV stabilization | Prevents the net going brittle and breaking down in storage |
| Consistent knit | Holds the bale evenly without weak points that tear |
| Correct width for your baler | Full bale-face coverage, no exposed shoulders |
| Comes off in one piece | Safer removal, less fragment risk, cleaner recycling |
Silopak manufactures HDPE bale net wrap from virgin UV-stabilized material, with a 12-month UV guarantee, built to hold dense bales and come off cleanly. We also supply LLDPE silage film and round bale film for buyers who need the airtight seal that fermentation requires. For guidance on matching net wrap to your specific machine, see our guide on net wrap for round balers. We have manufactured and exported these products since 2011.
Frequently Asked Questions
Q: What is HDPE net wrap made from?
HDPE net wrap is made from High-Density Polyethylene, a strong plastic polymer produced from ethylene. Ethylene monomers are joined through polymerization into long polymer chains, and the resulting HDPE is extruded into film, slit into narrow tapes, and knitted into an open mesh. HDPE is chosen for its high strength-to-weight ratio, which lets a light mesh restrain a heavy, dense round bale. Because it is an open mesh, it holds bales in shape but does not seal them airtight.
Q: Why must net wrap be removed before feeding?
Because HDPE does not digest in the rumen and accumulates there. Research shows net wrap placed in the rumen does not break down at all, even over weeks, while hay is almost fully digested. Consumed net wrap builds up into a mass that reduces stomach capacity, causing weight loss, reduced intake, and in severe cases a fatal blockage. All net wrap must be removed from every bale before feeding, and it must come off before grinding too, since grinding only chops it into fragments that cattle eat more readily.
Q: How do I remove net wrap safely?
Cut the net cleanly along the length of the bale through all layers with a blade, rather than tearing it, then peel it off as a single continuous sheet by rotating the bale. Check the bale surface for any clinging fragments and remove them, since small pieces are the ones most easily eaten unnoticed. Collect the removed net immediately and keep it where animals cannot reach it. The aim is to get the wrap off in one piece with no fragments left behind.
Q: Can HDPE net wrap be recycled?
Yes, HDPE is recyclable in principle, and organized agricultural plastic recycling schemes for used net wrap and silage film exist in a growing number of regions. Recycling works best when the wrap is kept reasonably clean, dry, and separated from other waste. Check whether a collection scheme operates in your area. Avoid burning used wrap, which releases harmful smoke and is increasingly restricted, and avoid burying it, since HDPE persists in the ground for a very long time.
Q: Can I use HDPE net wrap to make silage?
Not on its own. HDPE net wrap is an open mesh that holds a bale in shape but lets air through, so it cannot create the oxygen-free environment silage fermentation requires. For round bale silage, net wrap is applied first to compact and hold the bale, then several layers of airtight LLDPE silage film are applied over it to seal out oxygen. Net wrap and silage film do different jobs, and net wrap alone will not preserve wet forage as silage.
Reviewed by Sue Su, Marketing Director of Silopak, on 17 September 2026. This guide has been revised to focus on using, removing, and disposing of net wrap safely, and to correct the description of how HDPE is produced.
