LDPE and LLDPE look nearly identical on a spec sheet, both are polyethylene, both come as clear or tinted film, both get sold by the roll. In the field, they behave differently enough that picking the wrong one shows up fast, as torn mulch film halfway through a crop cycle, or greenhouse covering that hazes and weakens before the season is out. This guide breaks down what actually separates the two grades and which one fits mulch film versus greenhouse covering.

LDPE vs LLDPE: What Actually Makes Them Different

The difference comes down to molecular structure. LDPE (Low-Density Polyethylene) has a highly branched molecular chain, produced through high-pressure polymerisation. LLDPE (Linear Low-Density Polyethylene) has a mostly linear backbone with short, controlled branches, produced through a different polymerisation process. That structural difference is what drives the performance gap.

At equal density and thickness, LLDPE has meaningfully higher impact strength, tensile strength, puncture resistance, and elongation than LDPE. In practical terms, LLDPE tensile strength typically runs in the 15 to 30 MPa range, compared to roughly 8 to 25 MPa for LDPE. LDPE tends to be more transparent and easier to stretch by hand, while LLDPE is somewhat hazier but holds up better under mechanical stress, and often allows a thinner film gauge for the same durability, which is where a lot of the cost tradeoff actually plays out.

Which Grade Fits Mulch Film

Mulch film sits directly on the ground and takes mechanical abuse: stones, uneven soil, root growth pushing up from below, foot traffic during planting and harvesting. This is where LLDPE's puncture and tear resistance earns its keep, particularly for longer crop cycles or rougher terrain, since a film that survives installation and holds up mid-season saves real replacement cost. LDPE remains a fair choice for shorter-cycle crops or where the lower cost per kilogram matters more than maximum durability.

Thickness matters as much as the grade choice. For short-term crops, 20 to 30 micron black film is usually enough. For longer cycles, or where better temperature control matters, 30 to 50 micron silver-black film offers a solid balance. Anything above 50 microns is generally reserved for harsh weather, uneven terrain, or perennial crops that need the film to survive more than one season.

Colour is functional, not cosmetic. Black film suppresses weeds and absorbs heat into the soil. Silver-black film reflects light back up at the crop canopy, which helps with pest deterrence while still controlling weeds. Transparent film is used mainly for early-season soil warming, where weed suppression matters less than getting the soil temperature up quickly.

Which Grade Fits Greenhouse and Poly House Covering

Greenhouse film faces a different set of demands entirely. It sits overhead rather than on the ground, so mechanical puncture resistance from soil contact isn't the concern. Instead, the film needs strong optical clarity for light transmission to the crop below, and it needs to hold up under continuous UV exposure across multiple seasons, not just one crop cycle.

LDPE has historically been the dominant choice for greenhouse covering, largely because of its clarity and flexibility, combined with a UV-stabilising additive package suited for multi-year outdoor exposure. LLDPE blends are increasingly used where a structure needs extra tensile strength, high-wind regions or large multi-span greenhouses, without giving up too much on light transmission. The choice here is less about raw mechanical toughness and more about the additive package and the specific structure's exposure conditions.

Sourcing Grade You Can Actually Rely On

A grade that tests right on a lab spec sheet but arrives inconsistent from batch to batch still shows up as the same problem this guide opened with: torn mulch film mid-season, or greenhouse covering that hazes early. Consistency across shipments matters as much as the grade choice itself. SourceOne supplies quality LDPE and LLDPE for agricultural film applications, with orders placed directly through the SourceOne App, a single landed price that already builds in freight and margin, and a choice of advance, on-delivery, or credit payment terms, instead of negotiating each shipment separately with a broker.

The Subsidy Angle Buyers Should Know

For buyers and converters supplying the Indian agricultural market, it's worth knowing that plastic mulching is typically eligible for a subsidy of around 50% of project cost under the National Horticulture Mission and the Mission for Integrated Development of Horticulture, administered with cost norms that have historically been set at roughly Rs 32,000 per hectare in plain areas and Rs 36,800 per hectare in hilly areas, up to a limit of two hectares per farmer. Poly house and greenhouse structures carry similar subsidy support, generally up to 50% of project cost through NHB, NHM, and NABARD-linked schemes.

Worth flagging to customers who ask: the 50% figure is the scheme's headline rate, but because the government's cost norms are typically set below current market rates, the subsidy a farmer actually receives in practice often works out closer to 35 to 40% of real project cost, not the full 50%. Setting that expectation upfront avoids a farmer feeling short-changed partway through a purchase decision.

These norms vary by state and are revised periodically, so treat the figures here as a general reference point rather than a current number to quote to a customer. What matters for demand planning is that subsidy disbursement cycles genuinely influence when farmers place mulch film and greenhouse film orders, buying activity tends to cluster around scheme approval windows rather than spreading evenly through the year.

Frequently Asked Questions

Is LLDPE better than LDPE for mulch film?

LLDPE generally offers higher tensile strength and better puncture resistance at the same thickness, which is why it's often preferred for mulch film, especially where the film needs to withstand stones, root growth, or a longer crop cycle. LDPE remains a reasonable choice for shorter cycles or where cost is the primary constraint, since it's typically less expensive per kilogram.

What thickness of mulch film should I use?

For short-term crops, 20 to 30 micron black film is usually sufficient. For longer cycles or better temperature control, 30 to 50 micron silver-black film offers a good balance. Above 50 microns is generally reserved for harsh weather, uneven terrain, or perennial crops that need the film to last multiple seasons.

Can the same film be used for mulch and greenhouse covering?

Not usually. Mulch film sits on the ground and needs puncture and tear resistance above all else. Greenhouse or poly house covering film sits overhead, is exposed to continuous UV over multiple seasons, and needs strong optical clarity and light transmission. The additive packages and grade selection differ between the two applications even when both are polyethylene-based.

Are farmers eligible for subsidy on plastic mulch film in India?

Yes, plastic mulching is typically eligible for a subsidy of around 50% of project cost under India's National Horticulture Mission and the Mission for Integrated Development of Horticulture, subject to per-hectare cost norms that vary by state and terrain. Because cost norms are often set below current market rates, the effective subsidy in practice can work out closer to 35 to 40% of actual project cost. Farmers and buyers should confirm the current subsidy percentage and cost ceiling with their state horticulture department, since norms are revised periodically.

Choosing the Right Grade Comes Down to Where the Film Sits

The simplest way to think about LDPE versus LLDPE for agricultural film is to ask where the film actually sits and what it has to survive. On the ground, fighting punctures and tears, LLDPE's linear structure earns its strength advantage. Overhead, prioritising light transmission across multiple seasons, LDPE's clarity keeps it relevant, with LLDPE blends stepping in where wind load is the bigger risk. Getting this choice right up front, and sourcing it from a supplier who can guarantee batch consistency, avoids a mid-season film failure that costs far more than the price difference between grades ever would.

This article is for general informational purposes and reflects publicly available technical and regulatory information at the time of writing. Subsidy percentages and cost norms are set by government schemes that vary by state and are revised periodically; always confirm current figures with the relevant state horticulture department before making purchasing or budgeting decisions based on them.