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Introduction to Packaging Materials for Liquid Cosmetics

Time: Mar 19,2026

Definition and Characteristics of Liquid Cosmetics

Liquid cosmetics refer to cosmetic preparations that are in a fluid state at a standard temperature of 25℃. They have a wide range of viscosities, from water-like to highly viscous gels. Their core characteristics include:

Fluidity: The product can flow freely under the influence of gravity, with a wide range of viscosities (from water-like to highly viscous essence/cream).
Homogeneity: Usually in the form of solutions, emulsions (water-in-oil/O/W or oil-in-water/W/O), suspensions or gels, etc., the components should be evenly distributed (except for suspensions).
No fixed shape: It needs to rely on a container to take shape and be dispensed.
Easily penetrable/volatile: Compared with creams and ointments, liquids are more likely to penetrate packaging materials or volatile components are more prone to loss (high requirements for barrier properties of packaging materials).
Susceptible to contamination: Higher risk of exposure to air and the external environment after opening (high requirements for the sealing property of packaging materials and ease of use).

Case studies of liquid product categories

Category	Representative Products	Packaging Challenges
Skincare	Toner, Essence, Emulsion, Cleansing Oil	Preventing volatilization/oxidation, precise dispensing
Hair Care	Shampoo, Hair Conditioner, Hair Oil	Moisture resistance, preventing thick liquid from clogging pump heads
Body Care	Body Wash, Body Lotion, Body Oil	Leakage prevention, one-handed operation convenience
Color Cosmetics	Liquid Foundation, Nail Polish, Perfume, Liquid Eyeliner	Preventing drying and caking, light-proof storage
Special Categories	Aerosol products (with propellants), exfoliating scrubs with particles	Pressure resistance, preventing sedimentation/stratification

Liquid cosmetic products
Packaging solution design

1.Packaging case and applicable scenarios

Packaging Type	Typical Products	Application Scenarios	Design Reasons
Pump Bottle	Vacuum pump, lotion pump, spray pump	Essence, emulsion, facial mist	Anti-oxidation, precise dispensing, anti-backflow contamination
Dropper Bottle	Glass dropper + rubber bulb	High-activity essence, essential oils	Light-proof storage, controlled single dosage
Tube	Aluminum-plastic composite tube, plastic tube	Sunscreen milk, primer lotion	Anti-contamination, portability, high squeeze-out rate
Aerosol Can	Aluminum can + pressure-resistant valve	Dry hair shampoo spray, sunscreen spray	Requires propellant, uniform atomization
Wide-mouth Jar	Jar/cream jar + inner lid	High-viscosity gel, exfoliating scrub with particles	Easy scooping, anti-evaporation
Perfume Bottle	Glass bottle + spray/dab-on applicator	Perfume, fragrance oil	Prevents alcohol volatilization, enhances premium feel

2. Core Logic of Design Decisions

Design Dimension	Key Questions	Solution Examples	Underlying Reasons
Product Compatibility	Does the packaging react with product ingredients?	Glass bottles for acid-containing products → Avoid plastic leaching	Prevent ingredient inactivation and migration substance exceeding standards
Barrier Properties	Is light/oxygen/volatilization protection required?	Dark PET bottle + aluminum-coated inner bag → Protect Vitamin C essence	Extend shelf life and maintain active ingredient efficacy
Functionality	How to balance sealability and ease of use?	Vacuum pump bottle → One-way exhaust to prevent backflow + metered dispensing	Enhance user experience and reduce secondary contamination
Sustainability	Does it comply with environmental regulations?	PCR plastic bottle body + replaceable core → Reduce virgin plastic usage	Meet ESG requirements and lower carbon footprint
Cost Efficiency	How to optimize packaging costs?	Standardized bottle shape + differentiated printing → Reduce mold costs	Control BOM costs and improve gross margin potential

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