Material focus
LLDPE selection, applications, and sibling resin routing on this page.
LLDPE
LLDPE Injection Molding: Properties, Applications and Design Guide
Linear low-density polyethylene (LLDPE) is a flexible polyethylene with short, regular branches that gives better tensile strength, puncture resistance, and environmental stress crack resistance than LDPE.
LLDPE
When to specify LLDPE
How procurement and design teams use LLDPE on injection molded programs.
Linear low-density polyethylene (LLDPE) is a flexible polyethylene with short, regular branches that gives better tensile strength, puncture resistance, and environmental stress crack resistance than LDPE. Injection molders use it for flexible lids, closures, containers, and toys that must flex without cracking, especially where detergents or oils can cause stress cracking. Many LLDPE grades are designed for film, so confirm an injection molding grade with suitable flow before you lock the material on the drawing. At NetProto, programs run from first-article validation through production on one hardened steel tool with no minimum order quantity. Upload CAD on the instant quote platform for DFM feedback before tooling release.
Key traits
Why buyers specify LLDPE
Engineering and sourcing highlights. No NetProto processing numbers on this page.
Sourcing
Grade and compliance context travels with CAD on the instant quote platform.
Program fit
First articles through production on one steel tool, no MOQ.
NetProto platform
Instant CAD quoting and DFM feedback before tooling release.
Tooling lead time
Hardened steel tool build in about 10 business days on qualified programs (part complexity dependent).
Common grades
Common LLDPE (Linear Low Density Polyethylene) grades by use case
Pick one of these on the instant quote, or name any other commercial grade in the RFQ notes.
| Use case | Example grade | Typical parts |
|---|---|---|
| High flow general | ExxonMobil LL 6201 | Household goods, toys, and tough thin wall moldings |
| High flow / tough | Dow DANA-7144 | Household tools, toys, and flexible consumer parts |
Applications
Where this resin shows up on BOMs
Typical molded parts and what to specify on the purchase order.
| Application | Why this resin | Specify on the PO |
|---|---|---|
| Flexible lids and snap-on covers | Repeated flexing without cracking | Injection molding grade, color, food documentation if needed |
| Containers for detergents and oils | Better stress crack resistance than LDPE | Chemical exposure list |
| Toys and soft consumer parts | Toughness and flexibility at low cost | Compliance filters from your program |
Routing
LDPE, LLDPE, or HDPE
Pick the polyethylene by flexibility and stress crack exposure.
| Need | Start with | Why |
|---|---|---|
| Softest feel and easy processing | LDPE | Highly branched, very flexible |
| Flexing without cracking | LLDPE | Tougher with better stress crack resistance |
| Stiff parts that hold shape | HDPE | Higher density and stiffness |
RFQ
Ready to quote? Have this information ready
Prepare these details, then upload CAD on the instant quote platform.
Flexibility target, or a reference sample
Stress crack exposure (detergents, oils, surfactants)
Confirmed injection molding grade, or ask for a candidate
Food or other compliance filters (supplier documentation)
Color: natural, black, or masterbatch
Commercial grade, or the use case to match (high flow, toughness, ESCR, household and toy applications)
Expected annual volume (helps cavity and tool planning)
Next step
Upload CAD for an instant quote
Grade not finalized? Note LLDPE on the RFQ and attach environment notes.
Compare and explore
Related guides
Pairwise comparisons and sibling material pages.
LDPE
Softer flexible polyethylene.
LDPEHDPE
Stiffer polyethylene.
HDPEPP vs PE
Polyolefin routing.
PP vs PEPolypropylene
Higher heat and living hinges.
PolypropyleneMaterials library
Browse all resin guides.
Materials libraryReading a material datasheet
What the TDS (Technical Data Sheet) values mean for a molded part.
Reading a material datasheetSpecify resin grade on an RFQ
How to write grade, color, and fillers so the quote matches the part.
Specify resin grade on an RFQFAQ
LLDPE injection molding FAQ
What is the difference between LLDPE and LDPE?
LLDPE has a more linear structure, so it is usually tougher and more resistant to stress cracking, while LDPE is softer and easier to process. At NetProto, describe the flexing and chemical exposure on the RFQ so DFM can confirm the right flexible PE.
Are all LLDPE grades suitable for injection molding?
No. Many LLDPE grades are made for film extrusion and flow poorly in a mold. At NetProto, list the grade or ask for a candidate during DFM so the resin suits injection molding.
Should I choose LLDPE or HDPE?
Choose LLDPE when the part must flex and resist cracking, and HDPE when it must stay stiff and hold shape under load. At NetProto, share a reference part or stiffness target so DFM can route the material.
What is the minimum order quantity for molded parts at NetProto?
NetProto has no minimum order quantity on molded parts from your production tool. Upload CAD on the instant quote platform to scope tooling and part pricing for your volume.
How do I quote this resin without a final grade selected?
List the resin family on the RFQ, attach environment and compliance notes, and upload CAD. At NetProto, engineers use DFM review to narrow grades before tooling release.
Does NetProto publish processing parameters for LLDPE?
No. Processing windows and shrink values come from your supplier TDS for LLDPE. At NetProto, attach the grade datasheet to your project after DFM review.
Next step
Quote LLDPE parts with your CAD
Upload geometry and list LLDPE or the target grade on the instant quote platform.