Spray pumps

For low-viscosity liquids like water or alcohol, a standard dip tube and 0.2cc to 0.5cc output is sufficient. However, for high-viscosity liquids like lotions or gels, you must specify a large-diameter dip tube and a high-output engine (up to 2.0cc) to prevent clogging. Ensure the internal spring is made of SUS304 or SUS316 stainless steel to prevent corrosion, especially if the liquid contains acidic or alkaline components.

Always verify the neck finish size (e.g., 18/410, 20/410, 24/410) to ensure a leak-proof seal. It is mandatory to perform a vacuum leak test (typically -0.05MPa for 5 minutes) and a chemical compatibility test where the pump is submerged in your liquid for 48-72 hours at high temperatures to check for swelling, discoloration, or functional failure of the gaskets and valves.

For cosmetic and personal care applications, prioritize suppliers with ISO 9001 and ISO 14001 certifications. If the pumps are for medical or food-grade use, ensure the raw materials (PP, PE, or PETG) are BPA-free and FDA or REACH compliant. Request MSDS (Material Safety Data Sheets) for all plastic resins used in the production process to guarantee consumer safety.

A high-quality mist sprayer should provide a consistent spray pattern and fine atomization without 'spitting' large droplets. The prime count (number of strokes to first discharge) should be less than 5-7 times. Additionally, the actuation force should be smooth and consistent, typically requiring between 5N and 10N of pressure for ease of use by the end consumer.

Leakage is the most common complaint in bulk shipping. Require the supplier to use double-wall corrugated export cartons and PE inner bags for every 500-1000 units. Ensure the locking mechanism (left-right lock or clip lock) is engaged during packing. For high-value orders, request a Pre-Shipment Inspection (PSI) focusing on the torque strength of the screw caps.

On platforms like Made-in-China.com, suppliers often offer tiered pricing. To get the best rate, consolidate your colors to reach a higher volume per SKU, as custom colors usually trigger a 10,000-unit MOQ. Negotiate based on long-term volume forecasts rather than a single order, and ask for a sample fee rebate once the bulk order exceeds a certain value (e.g., $5,000).

Utilize the Secured Trading Service on Made-in-China.com to protect your payment until the goods are shipped. Always request a Gold Member or Audited Supplier report to verify the factory's actual production capacity. For large orders, hire a third-party inspector (like SGS or Intertek) to conduct a random sampling based on AQL 2.5/4.0 standards before final payment.

Since spray pumps are lightweight but voluminous, Sea Freight (LCL or FCL) is the most economical for orders over 2 cubic meters. For smaller trial orders, Air Express (DHL/FedEx) is faster but expensive. Ensure the supplier provides an accurate Packing List and Commercial Invoice with the correct HS Code (typically 8424.89) to avoid customs delays and ensure smooth clearance in your destination country.