Basic Characteristics

Item	Parameter/Description	Test Standard	Key Feature
Primary Material	Low-Density Polyethylene (LDPE) / High-Density Polyethylene (HDPE)	GB/T 11115	Flexible / Rigid options available
Common Appearance	Transparent, Milky White, Custom Printed	Visual Inspection	Multi-color printing possible
Thickness Range	Single-layer thickness 0.015mm ~ 0.15mm	GB/T 6672	Selected based on load-bearing needs
Operating Temperature	-50℃ to 80℃ (Heat Seal Temp: 120℃-160℃)	ASTM D1790	Freezer-safe, not suitable for high-temperature retort

Mechanical & Physical Properties

Parameter	Typical Value (LDPE)	Typical Value (HDPE)	Test Method
Tensile Strength (MD)	≥20 MPa	≥30 MPa	GB/T 1040.3
Elongation at Break	≥500%	≥500%	≥500%
Dart Drop Impact Strength	≥0.5 J	≥0.8 J	≥0.5 J
Right-Angle Tear Force	≥80 N/mm	≥100 N/mm	QB/T 1130

Barrier & Safety Performance

Performance	Water Vapor Barrier	Oxygen Barrier	Food Safety & Hygiene Standards
Indicator	WVTR ≤15 g/(m²·24h)	OTR ≥5000 cm³/(m²·24h·0.1MPa)	Complies with food contact material requirements
Test Conditions	38℃, 90% RH	23℃, 0% RH	-
Feature Description	Excellent moisture barrier, average gas barrier	Suitable for products not requiring high oxygen barrier	Meets national standards like GB 4806.7

Specification Parameters

Parameter	Conventional Range	Customizable Range
Bag Style	Back-seal bag, Three-side seal bag, Handle bag, Roll stock	Stand-up pouch, Zipper bag, Custom-shaped bag
Width	100mm ~ 800mm	50mm ~ 2000mm
50mm ~ 2000mm	150mm ~ 1200mm	100mm ~ 2500mm
Printing	Single-side to multi-color printing	Double-side printing possible, glossy/matte lamination

Certifications & Standards

Certification Type	Standard Number	Standard Number
Food Contact Safety	GB 4806.7	China General Food-Grade Standard
Production Quality Management	ISO 9001 / HACCP	General Industry / Food Safety System
Recyclability Identification	GB/T 16288	Plastic Product Recyclability Marking
Export to EU	EU 10/2011	Food Contact Material Regulation

Application Reference Table

Packaged Content	Recommended Material & Specification	Alternative Options
Bread, Pastries	LDPE, Thickness 0.03-0.05mm, High Transparency	PP Packaging Bag
Vegetables, Fruits	Perforated HDPE/LDPE Bag, Thickness 0.02-0.04mm	Biodegradable Plastic Bag
Snacks	Color-Printed Composite Bag (PE inner layer)	Aluminized Film Composite Bag
Frozen Foods	LDPE or LLDPE, Thickness 0.05-0.08mm, Low-Temperature Resistant	Multi-layer Co-extruded Nylon Bag

Cost-Effectiveness Parameters

Type	Approximate Cost (CNY / 1000 pcs)	Typical Packaged Quantity	Common Application Scenarios
Common T-Shirt Bag	8 - 20	Retail, Loose Items	Supermarkets, Wet Markets
Food-Grade Flat Bag	15 - 50	Pre-portioned Packaging	Bakeries, Snack Shops
Custom Printed Handle Bag	80 - 300	Gift, Brand Packaging	Brand Stores, Promotions
Heavy-Duty Freezer Bag	40 - 100	Bulk Food Storage	Cold Chain, Wholesale

Key Guidelines

1.  Selection Points:

       Load-bearing & Thickness: Follow the principle of "thicker bags for heavier items, thinner bags for lighter items" to ensure puncture and tensile strength.

       Food Characteristics: For high-moisture or oily foods, opt for HDPE with better moisture barrier. To showcase the product, choose highly transparent LDPE.

2.  Printing & Design:

       Design artwork must account for PE material's elasticity; using spot colors or large color blocks is recommended.

       For heavy-duty packaging or bags subject to frequent friction, laminating the printed surface is advised to enhance wear resistance.

Proven Applications

   Chain Bakeries: Freshness packaging for pastries and bread (daily usage tens of thousands).

   Fresh Food E-commerce Platforms: Pre-packaged vegetable and fruit bags (custom sizes and breathability holes).

   Central Kitchens: Semi-finished product packaging for cold chain distribution (withstands -40°C low temperatures).