Q7: What should I consider regarding formula and material compatibility? | Luxury & Sustainable Solutions - COSJAR

Q7: What should I consider regarding formula and material compatibility? | COSJAR has been in the skincare & cosmetics packaging market for over 40 years.

Q7: What should I consider regarding formula and material compatibility?

We strongly advise conducting comprehensive internal testing (e.g., compatibility, shelf-life, and immersion tests at ambient and elevated temperatures for 2–3 months) before ordering.

• Acrylic Limitations:
Standard acrylic is sensitive to highly acidic/alkaline formulas, high SPF ratings, and alcohol/essential oils. For these formulations, we highly recommend our PP, PE or PET options.

• Pure Essential Oils & High Alcohol Content:
Due to their corrosive nature, these formulas are not recommended for our plastic packaging and are better suited for aluminum or glass containers.

• Light-Sensitive Formulas:
For formulas vulnerable to UV degradation, we recommend opaque packaging, deep color injection, or external/internal spray-painting to block out light effectively.



Meticulously crafted to offer durability, functionality, and style for all your packaging needs.

Q7: What should I consider regarding formula and material compatibility? | Innovative Skincare & Cosmetic Packaging - COSJAR

COSJAR specializes in luxury cosmetic packaging that blends sustainability with elegance. From refillable acrylic jars to airless bottles, our solutions help premium brands stand out.

All products are ISO-certified and customizable—ideal for clean beauty, high-performance formulas, and brand-conscious developers who demand excellence.

Trusted by global skincare leaders for over 40 years, we combine design precision, material innovation, and sustainable thinking in every package.