Chemical packaging bags should be specified from the exact chemical or mixture, concentration, physical form, temperature, contact time, stress, filling method, closure, outer package, transportation role, and applicable requirements. Material charts and general resin descriptions can help screen options, but they do not replace application-specific review and testing.
Begin with the current safety data sheet
Collect the current safety data sheet, or SDS, for each chemical or mixture. OSHA's Hazard Communication Standard uses a structured SDS format that includes identification, hazards, composition, handling and storage, physical and chemical properties, stability and reactivity, and other information. Review the official OSHA SDS requirements with qualified personnel.
Packaging-relevant facts may include:
- Chemical identity, mixture, and concentration.
- Liquid, paste, powder, granule, or solid form.
- Temperature at filling, storage, transportation, and use.
- Vapor, dust, static, flammability, reactivity, or pressure hazards.
- Incompatibilities, storage restrictions, spill response, and required controls.
- Transportation classification and the intended role of the bag or liner.
The SDS is a starting point. It does not establish that a particular polyethylene blend, thickness, seal, vent, or complete package is suitable.
Evaluate compatibility for the actual exposure
Compatibility depends on more than the chemical name. Concentration, temperature, contact duration, stress, permeation, resin, additives, and film construction can change performance. A short room-temperature observation may not reveal softening, swelling, embrittlement, strength loss, seal change, or permeation that appears over time.
Have a qualified material specialist assess the proposed resin or blend. Use chemical-resistance charts only as screening tools and confirm their source, conditions, and limitations. Where failure could have significant consequences, perform controlled testing with the actual product or a technically justified simulant under worst-case conditions.
Distinguish a liner from an authorized shipping package
A polyethylene liner or inner bag may be one component inside a pail, drum, box, tote, or other outer package. It is not automatically an authorized standalone package for transporting hazardous material.
Under 49 CFR 173.24, packages used for hazardous materials must meet general design, construction, filling, closure, compatibility, and performance requirements under conditions normally incident to transportation. The person offering the material for transportation is responsible for using authorized packaging and complying with applicable requirements.
Define the bag's role: process liner, dust cover, intermediate liner, primary receptacle, spill-control component, or part of a tested combination package. Do not print or describe a regulatory approval that has not been established for the complete system.
Define the physical demands
Chemical powders and granular products may be abrasive. Drums, bins, and totes can have seams, corners, hardware, or surface damage that punctures film. Automated filling may impose impact, heat, pressure, static, and seal contamination.
Document maximum weight, particle size and sharpness, fill rate, fill height, container geometry, pallet pattern, stacking, vibration, storage duration, temperature, and operator handling. Match material, thickness, dimensions, seals, and features to those conditions.
Use actual containers and maximum fill weights during trials. An oversized liner may fold and trap product; an undersized liner may stretch over corners and place excess stress on film or seals.
Specify closure and seal integrity
State how the bag is closed: heat seal, tie, tape, mechanical closure, or another approved method. For heat sealing, define equipment, temperature, dwell, pressure, seal width, cooling, contamination risk, inspection, and any required leak or seal-strength testing.
The closure must match the package's function. A process liner inside a closed drum has different requirements from a primary flexible package. Hazardous-material transportation requirements, authorized packaging instructions, and qualified regulatory review control where applicable.
Decide whether venting is appropriate
Champion Plastics lists full vents, butterfly vents, and pin holes among its capabilities. Venting may release trapped air during filling or palletization, but it can also allow dust, vapor, moisture, or product to escape.
Do not add vents solely for convenience. Review containment, worker exposure, contamination, static, pressure, storage, and transportation requirements. Define vent dimensions, location, quantity, tolerance, and testing only after qualified technical and regulatory approval.
Control static and ignition risks
Moving powders and flexible film can generate static. Champion Plastics lists anti-static and other additive capabilities, but an additive alone does not make a packaging system safe for a flammable atmosphere or combustible-dust environment.
Evaluate chemical and dust hazards, grounding and bonding, filling equipment, humidity, ventilation, operator practices, and facility controls. Specify required electrical properties, conditioning, test methods, limits, and retention over time. Avoid vague terms such as “static safe.”
Put approved information in the artwork
Chemical packaging may require product identifiers, workplace hazard-communication elements, lot codes, handling instructions, barcodes, or customer-specific warnings. The customer should provide exact regulator- and company-approved copy and graphics.
Define print location, color, legibility, durability, orientation, and revision. Confirm that required information remains visible after filling, folding, closing, and placement inside an outer package. The bag manufacturer reproduces approved content but does not determine the customer's labeling obligations.
Establish traceability and change control
A controlled specification may include resin or blend, dimensions, thickness and tolerance, bag style, seal construction, vent pattern, additives, print revision, pack-out, lot coding, inspection, certificate requirements, retention, and change-notification expectations.
Champion Plastics states that its quality management system is certified to ISO 9001:2015. Buyers should still define the application-specific documents, records, tests, and approvals they require.
Qualify the complete packaging system
Test with the actual chemical or a technically justified simulant under worst-case concentration, temperature, duration, stress, handling, storage, and distribution conditions. Evaluate film appearance and mechanical properties, seals, leakage, permeation where relevant, outer-package interaction, vents, printing, and operator use.
Document the approved chemical, concentration, temperature range, duration, package configuration, closure, test method, results, approver, and limits of the qualification. A successful result for one substance, concentration, or package should not be generalized to another without technical review.
What to send for a chemical packaging review or quote
- Current SDS and exact chemical or mixture identification and concentration.
- Physical form, maximum fill weight or volume, particle size, and fill temperature.
- Container and bag dimensions, bag role, outer package, and required overhang or closure.
- Storage temperature and duration, chemical contact time, handling, palletizing, and transportation role.
- Proposed material, thickness, seals, vents, additives, printing, and pack-out if known.
- Applicable regulatory, customer, documentation, testing, traceability, and change-control requirements.
- Samples, qualification protocol, acceptance criteria, order quantity, and timing.
Discuss your specification with Champion Plastics
Champion Plastics manufactures custom polyethylene bags, liners, and films for industrial and chemical applications. Call 800-526-1230 to review the controlled specification and determine which samples, technical approvals, and qualification trials are needed before production.