Selecting the right bulk bag requires considering multiple factors. This guide will help you systematically understand all aspects of bulk bag selection.
Overview of Selection Process
Material Analysis → Determine Load → Select Type → Determine Specs → Select Accessories → Confirm Certifications
Step 1: Material Analysis
Material Property Assessment
Property
Description
Impact
Density
Bulk Density of Material
Determines Bulk Bag Volume
Flowability
Ease of Material Flow
Affects Inlet/Outlet Design
Particle Size
Granule Size
Affects Leak-proof Requirements
Moisture Content
Water Content
Affects Moisture-proof Requirements
Temperature
Material Temperature
Affects Material Selection
Material Hazard Assessment
Hazard Level
Material Type
Bulk Bag Requirement
No Hazard
Ordinary Materials
Type A Bulk Bag
Flammable Dust
Flour, Sugar Powder, etc.
Type B Bulk Bag
Flammable/Explosive
Chemical Powders, Metal Powders
Type C or D Bulk Bag
Corrosive
Acidic/Alkaline Materials
Special Materials
Step 2: Determine Load
Safe Working Load (SWL) Selection
Material Density (kg/m³)
Loading Amount
Recommended SWL
500-700
1m³
750kg
700-900
1m³
1000kg
900-1200
1m³
1250kg
1200-1500
1m³
1500kg
>1500
1m³
2000kg
Safety Factor (SF) Selection
Usage Type
Recommended SF
Single Use
5:1
Reuse (Within 5 Times)
6:1
Reuse (More than 5 Times)
6:1 or 8:1
Dangerous Goods
6:1 or 8:1
Step 3: Select Bulk Bag Type
By Shape
Shape
Characteristics
Application Scenario
Round
Uniform Stress Distribution
Materials with Good Flowability
Square
Stable Stacking
Requires Stacking Storage
U-shape
Strong Load Bearing Capacity
Heavy Load Materials
By Safety Type
Type
Characteristics
Application Scenario
Type A
No Static Protection
Non-flammable Materials
Type B
Prevents Propagated Discharge
Flammable Dust
Type C
Conductive, Grounding Required
Flammable/Explosive Environments
Type D
Static Dissipative, No Grounding Required
Mobile Work Environments
By Inlet/Outlet
Inlet:
Type
Application Scenario
Open Mouth
Granular Materials, Fast Filling
Standard Port (350-500mm)
General Purpose
Small Port (200-300mm)
Powder Materials, Prevent Overflow
Conical Port
Matches Filling Equipment
Outlet:
Type
Application Scenario
Flat Bottom
No Discharge Needed or Top Discharge
Standard Port
General Discharge
Full Open Bottom
Fast Discharge
Spout Style
Prevents Material Splashing
Step 4: Determine Specifications
Volume Calculation
Formula:
Required Volume = Loading Weight / Material Density
Example:
Loading Weight: 1000kg
Material Density: 800kg/m³
Required Volume: 1000 / 800 = 1.25m³
Common Specifications
SWL
Dimensions (Reference)
Volume
500kg
80×80×80cm
0.5m³
750kg
85×85×100cm
0.7m³
1000kg
90×90×110cm
0.9m³
1250kg
95×95×120cm
1.1m³
1500kg
100×100×130cm
1.3m³
2000kg
105×105×150cm
1.7m³
Step 5: Select Accessories
Liner Selection
Requirement
Recommended Liner
Moisture Proof
PE Liner
Leak Proof
Thick PE Liner
Barrier
Aluminum Foil Liner
Anti-static
Conductive Liner
Food Grade
Food-grade PE Liner
Loop Selection
Type
Characteristics
Application Scenario
2 Loops
Simple and Economical
Light Load Materials
4 Loops
Good Stability
General Purpose
Sleeve Loops
Protects Loops
Heavy Load Materials
Coating Selection
Type
Function
Application Scenario
Uncoated
Breathable
Dry Materials
Inner Coating
Moisture and Leak Proof
Powder Materials
Outer Coating
Waterproof and Sunproof
Outdoor Storage
Step 6: Confirm Certification Requirements
Food Grade Certification
Certification
Applicable Market
FDA
USA
EU 10/2011
European Union
GB 4806
China
Dangerous Goods Certification
Certification
Description
UN Certification
Dangerous Goods Transport
IMDG
Sea Transport of Dangerous Goods
Quality Certification
Certification
Description
ISO 9001
Quality Management
ISO 14001
Environmental Management
Selection Checklist
Use this checklist to ensure complete selection:
Material properties confirmed
Safe Working Load determined
Safety Factor selected
Bulk Bag type determined
Size specifications determined
Inlet/Outlet selected
Accessories selected
Certification requirements confirmed
Usage environment considered
Transportation method considered
Common Selection Errors
Error
Consequence
Solution
SWL Selected Too Small
Overload Risk
Accurately calculate based on material density
Ignoring Material Temperature
Material Deformation
Select High-temperature Resistant Materials
Ignoring Static Electricity Risk
Safety Accidents
Evaluate Material Hazard Level
Ignoring Outdoor Use
Rapid Aging
Select UV-treated Products
Improper Accessory Selection
Inconvenient Use
Select Based on Actual Needs
Selection Cases
Case 1: Fertilizer Packaging
Material Information:
Material: Compound Fertilizer Granules
Density: 900kg/m³
Properties: Hygroscopic
Selection Result:
SWL: 1000kg
SF: 6:1 (Multiple Uses)
Type: Square Bulk Bag
Inlet: Standard Port
Outlet: Conical Port
Liner: PE Liner
Coating: Inner Coating
Case 2: Flour Packaging
Material Information:
Material: Flour
Density: 600kg/m³
Properties: Flammable Dust, Food Grade
Selection Result:
SWL: 750kg
SF: 6:1
Type: Type B Bulk Bag
Inlet: Small Port + Liner
Outlet: Standard Port
Liner: Food-grade PE Liner
Certification: FDA, GB 4806
Conclusion
Correct bulk bag selection is the prerequisite for safe use. If you need selection support, please contact our technical team!
We will provide professional selection advice based on your specific needs.
