1–100 cP Low viscosity | Standard lotion or liquid dispenser pump | 0.5–1.0 mL | Typically ±10% after priming | Commonly available with 28/410 neck finish; verify dip-tube and gasket dimensions | Liquid soap, hand sanitizer, shampoo, light cleansers | Use a valve design that limits dripping and maintains reliable pump return. |
100–1,000 cP Light to medium viscosity | Lotion pump with standard or moderate-output spring mechanism | 0.8–1.5 mL | Typically ±8–12% after priming | 28/410 is widely used; closure fit depends on neck finish, thread engagement, and sealing liner | Body lotion, hair conditioner, liquid creams, moisturizing gels | Select a dip tube with sufficient internal diameter to reduce flow restriction. |
1,000–5,000 cP Medium viscosity | High-viscosity lotion pump or piston-style dispenser | 1.0–2.0 mL | Typically ±10–15% without product-specific calibration | Available in 28/410 configurations, subject to actuator height and pump-body clearance | Thick lotions, cleansing creams, liquid makeup, concentrated conditioners | A piston chamber can improve repeatability when the product is difficult to draw through a dip tube. |
5,000–20,000 cP High viscosity | Large-orifice piston pump or high-viscosity dispensing pump | 0.5–2.0 mL | Typically ±15–20%; requires product-specific testing | 28/410 can be used when the closure, pump stem, and sealing components are matched | Thick creams, hair masks, body butters, dense gels | Use a wide flow path, positive shut-off valve, and sufficient actuator force to prevent incomplete strokes. |
20,000–50,000 cP Very high viscosity | Heavy-duty piston, airless, or specialized high-viscosity dispenser | 0.2–1.5 mL | Typically ±15–25%; calibration and temperature control are important | Possible with selected 28/410 assemblies; compatibility must be confirmed through fit, torque, leakage, and dispensing tests | Barrier creams, dense treatment products, petroleum-based gels, heavy cosmetic formulas | Temperature strongly affects viscosity; test at the intended filling, storage, and use temperatures. |
50,000–100,000+ cP Extremely high viscosity | Specialized piston, cartridge, or mechanically assisted dispenser | 0.1–1.0 mL | Application-specific; commonly ±20% or more without dedicated calibration | 28/410 fit is application-dependent and may require a reinforced closure or alternate dispensing package | Very dense pastes, sealants, heavy ointments, highly filled formulations | Evaluate user force, priming time, air entrapment, backflow, and compatibility with the package material. |