If you've ever tried to order custom poly bags, you've probably come across three letters: LDPE, HDPE, and LLDPE. They all start with 'polyethylene,' but they behave very differently on the production line – and on your product.
This guide explains what each material does best, so you can order with confidence.
LDPE (Low-Density Polyethylene)
LDPE is the most common material for plastic bags. It's flexible, transparent, and has a soft feel.
- Best for: Garment bags, bread bags, dry cleaning bags, and general-purpose custom flat bags.
- Key traits: Stretchy, good clarity, heat-sealable, economical.
- Thickness range: 0.015-.10 mm.
- Relative cost: $$ (mid-range)
When Is LDPE a Practical Choice?
LDPE is commonly reviewed when a project needs flexibility, a softer feel, useful clarity and heat-sealing. The finished construction, resin grade and thickness still need to be confirmed against the packed product and the required test method.
HDPE (High-Density Polyethylene)
HDPE is stiffer and more rigid than LDPE. It has a crinkly feel and lower clarity -but it's stronger per micron, so you can use less material.
- Best for: Retail shopping bags, grocery bags, T-shirt bags, and merchandise bags.
- Key traits: High tensile strength, economical, less transparent.
- Thickness range: 0.010-.05 mm.
- Relative cost: $ (most economical)
When Is HDPE a Practical Choice?
HDPE is commonly reviewed when stiffness and strength per unit thickness matter more than a soft, highly transparent film. The final choice depends on handling, sealing, appearance and the agreed specification rather than the resin name alone.
LLDPE (Linear Low-Density Polyethylene)
LLDPE combines the flexibility of LDPE with the strength of HDPE. It's tougher and more puncture-resistant, making it ideal for heavy-duty applications.
- Best for: Stretch wrap, heavy-duty bags, frozen food packaging, industrial liners.
- Key traits: High puncture resistance, good tear strength, excellent stretchability.
- Thickness range: 0.015-.20 mm.
- Relative cost: $$$ (premium)
When Is LLDPE a Practical Choice?
LLDPE is commonly reviewed for projects that need toughness, stretch and puncture resistance. Confirm the blend, thickness basis, tolerance and finished-bag test before using a nominal material comparison for purchasing.
LDPE, HDPE and LLDPE Comparison Table
| Material | Tensile strength | Sealability | Transparency | Typical thickness examples |
|---|---|---|---|---|
| LDPE | Moderate; confirm by test | Good heat-sealing potential | Usually good | Project-dependent; often reviewed around 0.03–0.10 mm |
| HDPE | Higher stiffness per micron | Good when process is set | Usually lower than LDPE | Project-dependent; often reviewed around 0.02–0.08 mm |
| LLDPE | High toughness potential | Good when process is set | Good to moderate | Project-dependent; confirm with the finished-bag specification |
These are directional material comparisons and thickness examples, not universal standards or production promises. Resin grade, blend, process and tolerance must be confirmed for the actual order.
Which One Should You Choose?
There's no single 'best' material -it depends on what you're packaging.
- Need clarity and softness? →LDPE (most common for poly bags)
- Maximizing strength at lowest cost? →HDPE (good for retail bags)
- Need puncture resistance for heavy items? →LLDPE (or a blend)
Many factories can also produce blended materials that combine properties. If you're unsure, start with a sample order in your most likely material and test it with your actual product.
Custom Options
Every PE bag type can be made in LDPE, HDPE, or LLDPE – or a custom blend. OEM printing (gravure) is available regardless of material choice. MOQ is confirmed by specification; trial quantities are reviewed per specification for new customers.
If you're not sure which material fits your product, send us your specs and we'll recommend the most cost-effective option.
Not Sure Which Material Is Right for You?
Send us your product details and we'll recommend the material that fits your application, then confirm the sample basis and charge against that specification.
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