09,17,2026 2 views
Make cosmetic packaging materials
Don't underestimate the small bottle cap of essence liquid
How many projects are focused on details
The blueprint looks perfect, but mass production has collapsed?
The blueprint looks perfect, but mass production has collapsed?
Does the appearance change its face as soon as it comes into contact with the material?
All samples are OK
Preparing for export, I discovered that the compliance documents were incomplete
A small dropperSeal
Often become the 'hidden killer' of projects
This article focuses onEssence bottle capTPEMaterial
Help you quickly grasp the core points of selecting materials
Essence liquid bottle cap
4 core evaluation dimensions
Before selecting, it is essential to confirm four mandatory indicators:
Process mass production performance
Most essence bottle caps arePP+TPE soft and hard encapsulation structureThe bonding strength between the material and the substrate is the primary indicator. At the same time, it is necessary to consider whether the liquidity is suitable for precision small part injection molding, hardness coverage range, batch production stability, and coloring ability.
Chemical compatibility of materials
Many essence contain oily ingredients such as isododecane. Poor quality TPE is prone to swelling, whitening, and precipitation when exposed to oily media for a long time, which can contaminate the material and damage the active substance. Therefore, formula immersion verification is necessary.
Sealing and usage performance
The elasticity of the material determines the sealing effect, and sealing failure can cause leakage and material oxidation. At the same time, pay attention to surface characteristics to avoid residue of the material causing the bottle cap to become sticky and dirty.
Regulations and Sustainable Requirements
To export to the European and American markets, complete compliance documents for raw materials are required; Under the trend of brand ESG, recyclability has also become an important additional item.
High frequency material selection
Pitfall Alert
Only refer to the parameter table and do not conduct actual measurements: the paper parameters meet the standard, but there is peeling and cracking of the coating after actual injection molding;
Omitting compatibility test: all indicators of the material are excellent, swelling failure occurs after contacting oily essence;
Confusion between finished products and raw material reports: Lack of compliance certification from raw material suppliers, export faces recall risks;
Blindly pursuing tactile sensation while neglecting mass production: excessive pursuit of soft tactile sensation leads to numerous injection molding defects and low yield.
Practical selection reference
Thermoplastic Treasure K Series TPE
For the sealing components of essence bottle cap and dropper, Keppel Jiaobao ® Thermoplastic Treasure K series TPE provides targeted solutions to the aforementioned pain points.
In terms of mass production process
Owning PPExcellent encapsulation ability，Soft hard composite is not easy to delaminateThe hardness range covers Shore A 30-90, and the flowability is suitable for precision molding processes to ensure stable batch quality;Excellent coloring performance, supporting customized appearanceLow adhesion surface reduces residual adhesion of the material.
Chemical compatibility aspect
Outstanding resistance to isododecane, suitable for oily formulas in skincare products, long-term contact with the body,Sealing performance and appearance remain stableReduce the risk of migration and precipitation, and protect the active ingredients of essence.
Compliance and sustainability aspects
Compliant with IEC 61249-2-21 halogen-free standard, meeting EU No 10/2011, US FDA CFR 21, EN71-3 standards, providing a complete set of raw material compliance documents, suitable for export; Support recycling in the production process and match the sustainable packaging needs of the brand.
Practical tips for implementation
Prioritize completing the PP encapsulation peeling test upon receiving the sample;
Accelerate immersion test with brand owned essence;
Request materials such as property tables and compliance certificates in the early stage of the project;
Determine the appropriate hardness based on sealing, hand feel, and processing difficulty.
