Hazmat & Dangerous Goods Prep

Understanding Walmart's Hazmat Requirements: A Critical Component for WFS Success

Selling hazardous materials through Walmart Fulfillment Services (WFS) requires strict adherence to safety protocols, regulatory compliance, and platform-specific requirements. With Walmart's growing emphasis on customer safety and operational efficiency, proper hazmat preparation isn't just about compliance—it's essential for maintaining your seller scorecard metrics, Buy Box eligibility, and long-term account health.

Walmart processes over 15,000 hazmat items daily through their fulfillment centers, making proper classification and preparation critical for seamless operations. Sellers who fail to properly prepare hazmat shipments face potential penalties, inventory suppression, and in severe cases, account suspension.

Walmart's Hazmat Classification System and Requirements

Walmart follows Department of Transportation (DOT) regulations and uses the UN (United Nations) classification system for hazardous materials. The platform recognizes nine primary hazard classes, with specific requirements for each:

• Class 1: Explosives (generally prohibited on marketplace)
• Class 2: Gases (compressed, liquefied, dissolved under pressure)
• Class 3: Flammable liquids (flash point below 60°C)
• Class 4: Flammable solids, spontaneously combustible materials
• Class 5: Oxidizing substances and organic peroxides
• Class 6: Toxic and infectious substances
• Class 7: Radioactive materials (generally prohibited)
• Class 8: Corrosive substances
• Class 9: Miscellaneous dangerous goods (including lithium batteries)

Each classification requires specific documentation, labeling, and packaging protocols that must be followed precisely to avoid fulfillment center rejections.

SDS Sheet Submission and Documentation Requirements

Safety Data Sheets (SDS) are mandatory for all hazmat products sent to WFS. Walmart requires SDS sheets to be submitted through Seller Center before your first shipment and updated whenever formulations change.

Step-by-step SDS submission process:

• Log into Seller Center and navigate to "Inventory" > "Manage Inventory"
• Select your hazmat item and click "Edit Product Info"
• Upload your 16-section GHS-compliant SDS sheet in PDF format
• Ensure the SDS matches your exact product formulation and supplier
• Wait for Walmart's hazmat team approval (typically 3-5 business days)

Your SDS must include all 16 required sections per GHS standards, with particular attention to Section 14 (Transport Information) which should clearly state the UN number, proper shipping name, hazard class, and packing group. Walmart's system automatically flags incomplete or non-compliant SDS sheets, resulting in inventory holds that can last 7-14 days while corrections are made.

UN Number Classification and Proper Shipping Names

Accurate UN number assignment is crucial for WFS acceptance. Common mistakes include using generic UN numbers or misclassifying products based on similar items rather than actual composition.

Most common UN numbers for Walmart Marketplace items:

• UN3480: Lithium metal batteries (standalone)
• UN3481: Lithium metal batteries packed with/contained in equipment
• UN3090: Lithium ion batteries (standalone)
• UN3091: Lithium ion batteries packed with/contained in equipment
• UN1950: Aerosols (non-flammable)
• UN1266: Perfumery products (flammable liquids)
• UN2794: Batteries, wet, filled with acid

Each UN number corresponds to specific packaging, labeling, and quantity limitations. For example, UN3480 lithium batteries are limited to 35kg net weight per package and require specific packaging instructions (PI965) under IATA regulations.

Lithium Battery Requirements: The Most Critical Category

Lithium batteries represent the highest volume hazmat category on Walmart Marketplace, with specific requirements that sellers frequently misunderstand. Walmart processes over 50,000 lithium battery shipments monthly through WFS, making compliance critical.

Essential lithium battery preparation requirements:

• UN38.3 test summary must be available (not always required for submission but must be maintained)
• Batteries must be shipped at 30% charge or less
• Individual cell protection required (non-conductive material)
• Package weight limits: 35kg for UN3480/3090, no limit for UN3481/3091
• Proper hazmat labels required on outer packaging
• Lithium battery handling labels mandatory

Power banks and portable chargers require additional documentation including capacity ratings in watt-hours (Wh). Products exceeding 100Wh face additional restrictions and may require special approval through Walmart's hazmat team.

Chemical Products: Packaging and Labeling Protocols

Chemical products including cleaning supplies, automotive fluids, and personal care items with hazardous components require careful attention to packaging group assignments and compatibility.

Packaging group requirements:

• Packing Group I: Great danger (requires UN specification packaging)
• Packing Group II: Medium danger (UN specification packaging recommended)
• Packing Group III: Minor danger (standard commercial packaging acceptable)

Walmart requires all hazmat chemicals to use leak-proof inner packaging with absorbent material. Combination packaging must meet UN specification testing requirements, and sellers must maintain certificates of compliance.

Labeling Requirements and Common Mistakes

Proper labeling is where most sellers encounter problems. Walmart's fulfillment centers use automated systems to scan and verify hazmat labels, making precision critical.

Required label elements:

• Proper shipping name and UN number
• Hazard class diamond labels
• Orientation arrows (for liquids)
• Handling labels (e.g., "Lithium Battery - Handle with Care")
• Emergency contact information

Most frequent labeling mistakes:

• Using outdated hazard diamond designs
• Incorrect UN number placement (must be within hazard diamond)
• Missing orientation arrows on liquid products
• Using generic "Dangerous Goods" labels instead of specific classifications
• Placing labels on package seams or corners where scanning is difficult

Impact on Seller Performance and Account Health

Hazmat compliance directly affects multiple aspects of your Walmart seller performance. The Seller Scorecard includes shipping performance metrics that can be negatively impacted by hazmat rejections. Each rejected shipment counts against your On-Time Delivery Rate and can affect your Pro Seller Badge eligibility.

Walmart's algorithm considers hazmat compliance when determining Buy Box placement. Products with frequent compliance issues may experience reduced visibility, even with competitive pricing. Additionally, repeated violations can trigger account reviews and potential suspension.

The platform maintains a 97% accuracy threshold for hazmat shipments. Sellers falling below this threshold face mandatory compliance training and potential inventory restrictions until performance improves.

WFS-Specific Preparation Steps

Before shipping hazmat products to Walmart fulfillment centers, complete this preparation checklist:

• Verify item setup in Seller Center includes correct hazmat classification
• Confirm SDS sheet approval status
• Use appropriate packaging materials and specifications
• Apply all required labels in correct positions
• Generate shipping labels through Seller Center (third-party labels may cause delays)
• Schedule delivery during regular business hours (hazmat shipments cannot be left unattended)

Remember that WFS charges additional fees for hazmat processing: $0.50 per unit for standard hazmat items and $1.00 per unit for lithium batteries. These fees are automatically calculated when you create your shipping plan.

Key Takeaways

• Documentation is critical: Submit complete, accurate SDS sheets before your first shipment and maintain compliance certificates for all hazmat products to avoid inventory holds and processing delays.
• Classification accuracy drives success: Use precise UN numbers and proper shipping names—generic classifications lead to fulfillment center rejections and negatively impact your seller scorecard metrics.
• Lithium batteries require special attention: Follow UN38.3 testing requirements, proper charge levels, and packaging specifications to avoid the most common hazmat compliance issues.
• Labeling precision matters: Use current hazard diamonds, correct placement, and all required handling labels—automated scanning systems reject improperly labeled packages immediately.
• Compliance affects profitability: Maintain the 97% hazmat accuracy threshold to preserve Buy Box eligibility, seller scorecard health, and avoid additional processing fees or account restrictions.