Most cosmetic brands face a stubborn quality issue. Filled liquid foundation and vitamin C mist turn yellow and dark after months of standard storage. Formulators often adjust preservative systems repeatedly but fail to fix the root cause. The problem lies in the inner coating quality of the aerosol tin can. Chemical reactions between cosmetic actives and tinplate metal trigger Vitamin C oxidation with tinplate and ruin product color and stability.
This oxidation process works just like browning fresh fruit in open air. Standard aerosol can coatings do not form full airtight barriers. High-temperature baking creates tiny invisible pinholes on the paint surface. Liquid formulas seep through these gaps and touch the tinplate base. This process causes iron ion migration and leads to formula yellowing, layering and spoilage.
SAILON accumulates years of packaging industry experience. We confirm that most non-formula cosmetic discoloration comes from weak can barrier performance. Ordinary single-coat cans only fit basic daily chemical products. They cannot protect high-activity acidic cosmetic formulas. Brands rely on professional anti-yellowing spray packaging to maintain long-term shelf stability.
1. 12-Month Formula Stability Test
We follow industrial standard accelerated testing rules. We test formulas with 10% vitamin C and niacinamide under regular warehouse conditions for 12 months. Delta E values measure color change. Lower values mean better lacquered aerosol can stability.
| Can Type | Active Ingredients | 6-Month Delta E | 12-Month Delta E | Formula Condition |
|---|---|---|---|---|
| Uncoated Bare Tin Can | 10% Vitamin C + Niacinamide | ＞6.5 (Severe Yellowing) | ＞12.0 (Heavy Browning) | Fully oxidized and unsellable |
| Single-Layer General Coated Can | 10% Vitamin C + Niacinamide | 2.1 (Slight Yellowing) | 4.8 (Obvious Color Shift) | Unstable with visible quality defects |
| SAILON PAM Double-Coated Cosmetic Can | 10% Vitamin C + Niacinamide | ＜0.3 (No Visible Color Difference) | ＜0.8 (Stable Color Tone) | Clear texture with intact active ingredients |
Test data proves single-layer coatings cannot block metal penetration. They fail to support long shelf-life premium cosmetic products. SAILON upgrades core technology with dual-layer high-purity PAM coating to stop oxidation fundamentally.
Our cans adopt precise two-pass baking technology. The first layer seals the tinplate base and fills micro gaps. The second layer covers and eliminates baking pinholes to build a full sealed barrier. Every can passes 100% microampere porosity testing before delivery.
This strict process delivers 24-month stable metal isolation. The BPA-free and odor-free PAM coating cures completely at high temperature. It never releases harmful substances or changes cosmetic scent and texture.
2. 45mm & 52mm Cosmetic Aerosol Can Selection Guide
Different cosmetic products require matched aerosol tin can sizes for filling compatibility and appearance quality. SAILON two mainstream sizes cover most mass-production cosmetic aerosol needs.
- 45mm Diameter Can: Fits 50ml to 100ml small-volume products. It works perfectly for setting spray, vitamin C brightening mist and travel-size skincare spray. The slim body delivers comfortable grip and delicate printing for luxury trial sets and gift packages.
- 52mm Diameter Can: Fits 100ml to 150ml large-volume products. It matches long-wear liquid foundation, hydrating mist and body care aerosol. The sturdy structure resists deformation during high-speed filling and stacked storage for large-scale production.
Most brands ignore viscosity and diameter matching during sampling. High-viscosity foundation causes uneven filling with narrow cans. SAILON provides professional sample testing and size matching to avoid mass production losses.
3. Frequently Asked Questions
Q1: Does PAM coating peel or dissolve in acidic cosmetic formulas?
A: Ordinary epoxy coatings corrode in weak acidic vitamin C formulas and produce impurities. SAILON cosmetic-grade PAM coating owns strong chemical inertness. It resists weak acid and weak base erosion and maintains full structural stability to meet cosmetic packaging safety standards.
Q2: How do you test formula compatibility with tinplate cans?
A: Run a 12-week accelerated stability test at 45℃ constant temperature. Brands apply for free SAILON sample cans to test formula color, layering and odor changes. This method accurately predicts long-term shelf performance and avoids batch quality risks.
Q3: Can double-layer PAM cans support custom exterior finishing?
A: Yes. The inner layer focuses on barrier protection. The outer surface supports offset printing, UV embossing, matte finishing and lamination. SAILON integrates structural production and brand customization for dual performance and visual value.
Q4: What other products fit this high-barrier aerosol tin can?
A: All active ingredient aerosol products work well, including fragrance deodorant spray, plant-based care spray and insect repellent spray. The coating effectively stops chemical reactions between formulas and tinplate substrates.
Contact the SAILON team for customized aerosol can solutions and free sample tests if your cosmetic products face oxidation and discoloration problems.