Minimum Order Quantity (MOQ): New Bulk Bags – 2,000 bags | Used Bulk Bags – 1 pallet minimum
Here’s a mistake that can cost pigment manufacturers thousands of dollars before the first truck even leaves the warehouse: ordering bulk bags based on dimensions and price without specifying what the bags actually need to do. A 35 × 35 × 50 FIBC might look perfect on a supplier’s quotation, but that doesn’t mean it can safely hold your iron oxide pigment, contain fine titanium dioxide powder, protect an expensive organic pigment from contamination, or discharge properly into your customer’s equipment. And when you’re purchasing 2,000, 5,000, or 20,000 bulk bags at a time, a small specification error becomes a very expensive problem. The solution is to build your bulk bag specifications around the actual pigment, its physical properties, your handling equipment, and your storage and shipping requirements—not whatever generic bag happens to be cheapest.
Two pigments that look nearly identical can require completely different bulk bag specifications.
Titanium dioxide may require careful fine-powder containment and contamination control.
Iron oxide pigments may create higher-density loading challenges.
Carbon black can generate substantial dust.
Organic pigments may have strict color-purity requirements.
And specialty effect pigments may require additional protection against particle damage, moisture, or handling stresses.
That’s why a proper flexible intermediate bulk container (FIBC) specification needs to cover much more than bag dimensions.
It should define the material, fill weight, fabric, construction, seams, liners, lifting loops, filling and discharge spouts, electrostatic requirements, and storage conditions.
Let’s break down the specifications that matter.
For many dry powdered pigments, a practical starting point is a coated woven polypropylene FIBC with fine-powder containment seams, a filling spout, a discharge spout, and a safe working load appropriate for the intended fill weight.
An internal liner may be appropriate when additional containment, moisture protection, or contamination control is required.
For dense pigments, bag dimensions must be selected carefully to avoid exceeding the rated SWL.
And where electrostatic hazards exist, the complete bag-and-liner configuration must be appropriately qualified.
| Specification | Common Starting Point | What to Verify |
|---|---|---|
| Bag material | Woven polypropylene | Product compatibility |
| Fabric | Coated for fine powders | Dust containment |
| Construction | U-panel, circular, or four-panel | Filled shape and handling |
| Internal liner | Optional | Barrier and contamination requirements |
| SWL | Based on target fill weight | Manufacturer qualification |
| Safety factor | Commonly 5:1 for single-trip bags | Intended use classification |
| Dimensions | Custom to material and equipment | Usable volume and pallet footprint |
| Filling top | Filling spout | Equipment connection |
| Discharge bottom | Discharge spout | Flow and unloading |
| Seams | Fine-powder containment design | Leakage performance |
| Lifting loops | Commonly four loops | Handling equipment compatibility |
| Electrostatic type | Application-specific | Qualified hazard assessment |
| Pallet | Rated for filled load | Stability and overhang |
| Labeling | Product and lot identification | Traceability |
| Storage | Dry, protected conditions as required | Product-specific requirements |
These are preliminary specifications, not a universal design suitable for every pigment.
The first specification should identify the exact pigment.
Not simply “industrial pigment.”
Different pigments have different:
Bulk densities.
Particle sizes.
Dust characteristics.
Flow behavior.
Moisture sensitivities.
Contamination requirements.
And potential electrostatic hazards.
A bulk bag suitable for one titanium dioxide grade may not be ideal for another.
The same applies to iron oxides, carbon black, and organic pigments.
Pigments may be supplied as fine powders, granules, or other dry forms.
May require coated fabric, suitable seams, and additional containment.
May generate less dust but still require evaluation for abrasion, segregation, and handling.
May be sensitive to particle damage or contamination.
The bag should be specified for the actual physical form of the material.
Bulk density determines how much pigment weight occupies a given volume.
Estimated Fill Weight = Usable Bag Volume × Measured Bulk Density
For example:
A pigment with a bulk density of 50 pounds per cubic foot occupying 40 cubic feet would theoretically weigh:
50 × 40 = 2,000 pounds.
However, the actual fill weight must remain within the bag’s rated safe working load and other operating limits.
Specify whether the density is loose, tapped, compacted, or measured under actual filling conditions.
These values may differ.
Safe working load, or SWL, is the maximum weight the FIBC is rated to carry under its intended conditions of use.
For pigment packaging, SWL must be selected based on the actual target fill weight.
Ordering a bag rated for 2,000 pounds and assuming it can safely carry additional weight because it appears underfilled.
That’s not how SWL works.
Never exceed the manufacturer’s rated capacity.
FIBCs are qualified for their intended use classification.
Single-trip bags commonly use a 5:1 safety factor.
Certain multi-trip designs use 6:1.
However, the correct requirements depend on the applicable standard and intended use.
A safety factor does not authorize overloading.
A 2,000-pound-rated bag remains limited to its rated SWL.
Dimensions should be selected based on the required usable volume and the handling system.
Length.
Width.
Height.
Filled footprint.
And filled height.
Nominal dimensions do not necessarily equal actual usable volume.
For high-volume pigment applications, representative filling trials should confirm capacity.
The following table illustrates theoretical fill weights using hypothetical bulk densities.
| Bulk Density | 30 ft³ Bag | 40 ft³ Bag | 50 ft³ Bag |
|---|---|---|---|
| 20 lb/ft³ | 600 lb | 800 lb | 1,000 lb |
| 30 lb/ft³ | 900 lb | 1,200 lb | 1,500 lb |
| 40 lb/ft³ | 1,200 lb | 1,600 lb | 2,000 lb |
| 50 lb/ft³ | 1,500 lb | 2,000 lb | 2,500 lb |
| 60 lb/ft³ | 1,800 lb | 2,400 lb | 3,000 lb |
| 70 lb/ft³ | 2,100 lb | 2,800 lb | 3,500 lb |
| 80 lb/ft³ | 2,400 lb | 3,200 lb | 4,000 lb |
These are mathematical estimates, not guaranteed capacities or safe working load ratings.
Most industrial pigment FIBCs are manufactured from woven polypropylene.
The fabric specification should consider:
Strength.
Permeability.
Abrasion resistance.
Product compatibility.
And applicable safety requirements.
For fine powdered pigments, fabric permeability is particularly important.
Generally lower cost.
Higher air permeability.
May be suitable for certain relatively coarse or low-dust pigments.
Reduces permeability through the woven fabric.
Often preferable for fine powdered pigments.
May improve containment.
But doesn’t automatically seal seams or closures.
Evaluate coated fabric for fine powders.
Consider uncoated fabric only when testing confirms adequate containment and all safety requirements are met.
Fabric weight is often expressed in grams per square meter (GSM).
However, GSM alone does not establish a bag’s rated safe working load.
The complete FIBC must be designed and qualified for its intended use.
Fabric specifications.
Manufacturer qualification documentation.
Rated SWL.
And relevant test results.
Avoid choosing a bag based only on fabric weight.
Several FIBC constructions are commonly used.
Versatile construction for many industrial materials.
Tubular woven body construction.
Flexible dimensional design.
Internal panels help maintain a more rectangular filled shape.
Baffled bags may improve pallet utilization, but their suitability depends on material flow and discharge requirements.
Fine pigment powders may escape through unsuitable seams.
Sewing needles create holes in the fabric.
Fine-powder containment seams.
Suitable spout attachment.
Additional sealing where necessary.
And leakage performance requirements.
A coated bag can still leak if the seams aren’t designed appropriately.
A liner provides an additional barrier inside the FIBC.
Fine-particle containment.
Moisture protection.
Contamination control.
And customer-specific barrier requirements.
Material.
Thickness.
Dimensions.
Attachment method.
Filling opening.
Discharge opening.
And electrostatic compatibility.
The liner must work with the complete bag and handling system.
Thicker liners may offer additional durability.
However, thicker isn’t automatically better.
Handling stresses.
Puncture risk.
Barrier requirements.
Material compatibility.
And cost.
The correct thickness should be established through engineering review and testing.
The filling spout should match the facility’s equipment.
Diameter.
Length.
Closure design.
And connection method.
For dusty pigments, controlled filling connections may help reduce material loss.
The discharge spout should match the customer’s unloading equipment.
Diameter.
Length.
Closure method.
Material flow characteristics.
And receiving hopper geometry.
Some pigments may require specialized discharge assistance.
Call or Text us at 832.400.1394
Most conventional FIBCs use lifting loops designed for forklift or lifting equipment.
Four-loop configurations are common.
Loop configuration.
Loop dimensions.
Lifting equipment compatibility.
And manufacturer handling instructions.
Never lift a bag using equipment or methods outside its intended design.
Certain pigment powders may present combustible dust hazards.
Some materials may have conductive characteristics.
The correct FIBC electrostatic classification must be determined through a qualified hazard assessment.
| Type | General Characteristic | Important Requirement |
|---|---|---|
| Type A | No dedicated electrostatic protection | Not appropriate where electrostatic ignition protection is required |
| Type B | Designed to prevent certain hazardous discharges | Does not control every ignition mechanism |
| Type C | Conductive, groundable construction | Requires proper grounding |
| Type D | Specialized static-protective construction | Must be used under qualified conditions |
Adding a liner may change the electrostatic behavior of the complete FIBC.
The bag-and-liner combination must be appropriately qualified.
Do not assume that an ordinary polyethylene liner is suitable for every Type C or Type D bag.
Fine pigments may create airborne dust during filling and discharge.
Fabric permeability.
Seam construction.
Filling connections.
Discharge closures.
And dust-collection equipment.
Packaging is one component of the overall dust-control system.
Some pigments require protection from unwanted moisture.
Coated fabric may reduce moisture penetration through the weave.
A suitable liner may provide additional protection.
However, neither automatically makes the complete bag waterproof.
Required barrier performance.
Closure integrity.
Storage conditions.
And transportation exposure.
Follow the pigment manufacturer’s storage requirements.
Pigment contamination can create expensive quality problems.
This is especially important for white, light-colored, or specialty pigments.
Previously used bags.
Dirty filling equipment.
Damaged liners.
Warehouse debris.
And residual material from other products.
Cleanliness requirements.
New versus used packaging.
Liner requirements.
Product-contact material compatibility.
And traceability procedures.
The pallet must support the filled bag safely.
Pallet dimensions.
Load capacity.
Bag overhang.
Forklift compatibility.
And transportation requirements.
Dense pigments can create substantial loads within compact bags.
Storage conditions can affect both the pigment and the bag.
Moisture exposure.
Temperature.
Sunlight and UV exposure.
Warehouse cleanliness.
Stacking arrangements.
And storage duration.
Follow the material and FIBC manufacturer’s instructions.
Not every filled bulk bag is suitable for stacking.
Stacking depends on the complete system.
Bag design.
Filled shape.
Pallet strength.
Material stability.
Warehouse conditions.
And manufacturer instructions.
Rated SWL alone does not establish stacking suitability.
Shipping introduces vibration, impacts, and load movement.
Filled bag stability.
Pallet compatibility.
Load restraint.
Closure security.
And applicable transportation requirements.
For high-value pigments, containment and contamination control may be especially important.
Pigment manufacturers may need to identify products by grade and production lot.
Product name.
Pigment grade.
Lot number.
Net weight.
Manufacturer identification.
And applicable handling or hazard information.
The exact labeling requirements depend on the product and regulatory context.
New bags generally provide better control over construction, cleanliness, and qualification.
For contamination-sensitive pigments, they may be preferable.
Used bags may be suitable for certain industrial applications only after appropriate evaluation.
Previous contents.
Fabric condition.
Seams.
Lifting loops.
Cleanliness.
Intended reuse classification.
And material compatibility.
A single-trip bag should not automatically be reused because it appears undamaged.
Before ordering thousands of bags, conduct representative trials.
Actual fill weight.
Filling time.
Dust leakage.
Filled dimensions.
Pallet stability.
Discharge time.
Residual material.
Liner movement.
And handling damage.
Any safety-related changes should receive the appropriate qualified review before use.
The lowest unit price doesn’t always deliver the lowest total cost.
A cheaper bag may create material loss, cleanup expenses, or production delays.
Bag purchase price.
Material loss.
Cleanup labor.
Filling efficiency.
Discharge efficiency.
Contamination risk.
Warehouse utilization.
And freight expenses.
The goal is to reduce total packaging cost without compromising safety or quality.
Suppose a pigment manufacturer purchases 25,000 bulk bags annually.
And improved packaging reduces handling time by one minute per bag.
25,000 minutes ÷ 60 = approximately 417 labor hours.
At a hypothetical fully burdened labor cost of $30 per hour:
417 × $30 = approximately $12,500.
That’s roughly $12,500 in illustrative annual labor savings.
Actual results depend on the operation.
But it demonstrates why packaging specifications should be evaluated beyond purchase price.
Use the following information when requesting a quote.
| Specification | Information to Provide |
|---|---|
| Product | Exact pigment name and grade |
| Material form | Powdered, granular, or specialty |
| Bulk density | Measured lb/ft³ or kg/m³ |
| Target fill weight | Pounds per bag |
| Rated SWL | Required capacity |
| Safety factor | Intended use classification |
| Bag dimensions | Length × width × height |
| Construction | U-panel, circular, four-panel, baffled |
| Fabric | Coated or uncoated |
| Fabric weight | GSM if specified |
| Seams | Fine-powder containment requirements |
| Liner | Material, thickness, attachment |
| Electrostatic type | Qualified requirement |
| Filling top | Spout dimensions and closure |
| Discharge bottom | Spout dimensions and closure |
| Lifting loops | Configuration and dimensions |
| Pallet | Footprint and load capacity |
| Cleanliness | Customer requirements |
| Labeling | Grade, lot, weight, and traceability |
| Storage | Environmental requirements |
| Quantity | Initial order and annual volume |
| Delivery | Destination ZIP code |
Call or Text us at 832.400.1394
Woven polypropylene is commonly used. Coated fabric may be preferable for fine powdered pigments.
Not always. Liners may provide additional containment, moisture protection, or contamination control where required.
The rated SWL must be appropriate for the intended fill weight and handling conditions.
Single-trip FIBCs commonly use a 5:1 safety factor. Other classifications may have different requirements.
Dimensions depend on measured bulk density, target fill weight, usable volume, pallet footprint, and handling equipment.
They’re often preferable for fine powders because coating reduces permeability through the woven fabric.
Some applications may require specialized electrostatic protection. The correct classification depends on a qualified hazard assessment.
Only when the complete packaging and storage system is suitable for stacking and the manufacturer’s instructions permit it.
Possibly for certain applications, but previous contents, cleanliness, condition, reuse classification, and compatibility must be verified.
Optimize dimensions, fabric, liners, containment, filling and discharge performance, and transportation efficiency while maintaining required safety and quality standards.
Pigment packaging is more complicated than choosing a bag with the right dimensions.
Titanium dioxide may require careful fine-powder containment.
Iron oxide pigments may create high-density loading challenges.
Carbon black can generate substantial dust.
Organic pigments may require strict contamination control.
And specialty pigments may have unique moisture, handling, or electrostatic requirements.
For purchasing managers, plant managers, pigment manufacturers, and industrial supply chain teams, the right process is straightforward.
Identify the exact material.
Measure its bulk density.
Determine the target fill weight.
Specify the fabric, seams, liners, and spouts.
Verify SWL and electrostatic requirements.
Match the bag to the filling, storage, and discharge equipment.
Then test the complete packaging system before placing a large order.
Because the best bulk bag specification isn’t necessarily the cheapest or most complicated one.
It’s the one that protects your pigments, works with your equipment, meets your safety requirements, and delivers the lowest practical total packaging cost.
Share This Post
