What Type of LLDPE Is Sibur 20211NP? A Guide to Imported Blown Film Resin Selection
Introduction
When film manufacturers source imported LLDPE, Sibur 20211NP is a widely available grade, yet many buyers lack full understanding of its additive formula and applicable scenarios. Film-grade linear low-density polyethylene is classified by comonomer type and melt flow rate, and pre-blended additives are a key factor affecting production performance. This article avoids complicated physical data to explain classification logic for general-purpose blown film LLDPE. Sibur 20211NP is a butene-copolymerized petroleum-based blown film LLDPE pre-compounded with standard slip and antiblock additives for direct mass production of general packaging films. It has a typical melt flow rate of 2.0 g/10min and density of 0.921 g/cm³.
Classification of LLDPE by Comonomer Type
LLDPE is divided into three main categories based on comonomers: butene, hexene and octene. Sibur 20211NP adopts the butene copolymerization route, the most widely used option globally with balanced performance and cost efficiency. It differs from high-toughness hexene and octene copolymerized grades with higher price premiums.
Four Subcategories of General-Purpose Blown Film LLDPE
Blown film LLDPE falls into four performance-oriented categories, and Sibur 20211NP belongs to the balanced general-purpose segment:
Balanced general blown film grade: Delivers balanced toughness, transparency and processing stability for shopping bags, industrial liners and composite inner films, the category that Sibur 20211NP fits into.
Heavy-duty packaging grade: Low melt flow rate with superior puncture resistance, designed for heavy industrial bulk sacks.
Metallocene premium film grade: High transparency and heat-seal strength for high-end food cling wrap.
Anti-aging agricultural film grade: Pre-mixed with UV stabilizers for long-term outdoor greenhouse films.
Sibur 20211NP is not optimized for heavy load, ultra-high transparency or long-term anti-aging applications. It stands out for universal compatibility. Supplied by Russia’s Sibur petrochemical plant with stable petroleum-based raw material supply, it serves as a mainstream imported alternative to domestic 7042 LLDPE.
Core Advantages of Sibur 20211NP
1.Pre-blended slip and antiblock additives for easy processingAdditives are pre-compounded at the factory. No extra antiblock masterbatch is required for standard film production, simplifying workshop formulation and eliminating film roll blocking issues for small and medium production lines.
2.Stable bubble formation and flexible blending compatibilityIts regular molecular structure reduces bubble swing during extrusion with a wide processing window. It can be blended with LDPE at any ratio to adjust film softness and transparency, suitable for both single-layer bags and multi-layer co-extruded films.
3.Balanced rigidity and toughness with good low-temperature puncture resistanceThe butene copolymer structure balances tear and puncture resistance. Films resist cracking during cold storage and transportation, meeting load requirements for daily packaging and industrial liners.
4.Clean additive system compliant with food contact standardsThe base resin is matched with food-safe slip additives with minimal precipitates. It can be used for fresh food and food packaging films when paired with compliant auxiliary materials, ideal for export food packaging orders.
Sibur 20211NP film-grade LLDPE features broad applicability and is a universal imported blown film resin suitable for small and large film manufacturers.
Suitable and Unsuitable Applications
Suitable products: Supermarket shopping bags, general garbage bags, industrial liners, composite food inner films, regular single-layer printing films.
Unsuitable for direct standalone use: Long-term outdoor greenhouse films, heavy-duty industrial bulk sacks, ultra-thin high-speed stretch wrap films.
Conclusion for Resin Selection
General-purpose blown film LLDPE should be selected based on production line conditions and product types. Sibur 20211NP is a petroleum-based butene-copolymerized imported LLDPE pre-loaded with standard slip and antiblock additives. It features low processing barriers, wide application coverage and steady supply, making it a cost-effective imported resin for mass production of general packaging films.
FAQ with Concise Answers
1.Is extra antiblock masterbatch needed when processing Sibur 20211NP?
Slip and antiblock additives are pre-blended. No extra addition is needed for regular films; a small amount can be supplemented for extra thick films.
2.Can Sibur 20211NP replace domestic 7042 LLDPE directly?
They share similar basic blown film performance and can be blended to cut costs. A small trial run is recommended to adjust process parameters due to different additive ratios.
3.Is Sibur 20211NP compatible with simple small blown film lines?
Yes. Pre-mixed additives allow direct feeding without complicated on-site formulation adjustments.
4.Can Sibur 20211NP be used for agricultural mulch films?
It can be blended in small proportions for short-cycle mulch films, but contains no UV stabilizers and is not suitable for long-term outdoor greenhouse films.
