What Is Aminopropyl Calcium Polysilsesquioxane Chloride?
Aminopropyl Calcium Polysilsesquioxane Chloride is a silicone-based compound created by first hydrolyzing and condensing 3-aminopropyltriethoxysilane, then combining the resulting network with calcium chloride. The process locks calcium ions into a flexible siloxane framework that has a gentle positive charge, helping it attract water. Silicones have been used in beauty products since the 1950s for their smooth feel and moisture-holding talent. This particular derivative is newer, appearing in skin care formulas over the past decade as brands searched for lightweight humectants that also condition skin.
The ingredient is produced in specialized reactors where the silane undergoes controlled water exposure. The reaction forms a cage-like polymer that is then treated with a measured amount of calcium chloride. After purification and drying the material becomes a fine white powder or viscous fluid, ready for blending into cosmetic bases.
You will most often spot Aminopropyl Calcium Polysilsesquioxane Chloride in leave-on moisturizers, hydrating serums, sheet masks, soothing after-sun gels and anti-aging creams. Formulators like it because it boosts moisture without a greasy skin feel and plays well with other actives such as vitamins, peptides or botanical extracts.
Aminopropyl Calcium Polysilsesquioxane Chloride’s Cosmetic Benefits/Uses
In skin care formulas this ingredient mainly serves two helpful roles
- Humectant – It draws water from the environment and from deeper skin layers up toward the surface, giving skin an instantly plumper look and helping to smooth fine lines caused by dryness
- Skin conditioning agent – By forming a soft, breathable film it leaves skin feeling silky and protected, reduces rough texture and can enhance the spreadability of creams or serums so they glide on evenly
Who Can Use Aminopropyl Calcium Polysilsesquioxane Chloride
This hydrating silicone suits almost every skin type, including dry, normal and combination skin because it pulls in water without sealing skin under a heavy film. Oily or acne-prone users usually tolerate it well thanks to its lightweight feel, though those extremely sensitive to silicones may prefer to avoid it.
The ingredient is synthesized entirely from mineral and industrial sources, with no animal-derived components, so it is considered suitable for both vegans and vegetarians.
No data suggest that it poses specific risks during pregnancy or while breastfeeding. Still, this is not medical advice and anyone who is pregnant or nursing should clear any skin care product with a doctor to be safe.
Aminopropyl Calcium Polysilsesquioxane Chloride does not make skin more sensitive to sunlight, so users do not need to take extra sun precautions beyond the usual daily SPF.
Potential Side Effects/Adverse Reactions
Side effects from topical use can vary from person to person. The points below list potential issues that could arise, though most users will not experience them when the ingredient is properly formulated and used as directed.
- Mild redness or warmth in very sensitive skin
- Tingling or slight stinging immediately after application
- Transient itchiness in areas with a damaged skin barrier
- Rare allergic contact dermatitis presenting as rash or swelling
- Watery eyes or irritation if the product migrates into the eye area
If any of these reactions occur stop using the product and consult a healthcare professional or dermatologist for guidance.
Comedogenic Rating
Rating: 1 out of 5. Aminopropyl Calcium Polysilsesquioxane Chloride is a lightweight silicone derivative that forms a breathable film rather than a heavy occlusive layer, so it is unlikely to clog pores. Its large, branched molecular structure sits mostly on the skin surface and does not mingle deeply with sebum, which further reduces the chance of comedone formation.
Because of this low score it is generally considered suitable for people who are prone to acne or frequent breakouts.
As with many silicones the finished product formula can influence real-world performance. Very rich creams that pair this ingredient with thick oils or waxes could still feel occlusive even though the silicone itself is not highly comedogenic.
Summary
Aminopropyl Calcium Polysilsesquioxane Chloride serves two main jobs in skin care: it acts as a humectant by attracting water to the skin surface and it conditions the skin by laying down a smooth flexible film that leaves a silky after-feel. The calcium within the siloxane network helps hold moisture while the aminopropyl groups improve compatibility with both water and oil phases, giving formulators a versatile tool for lightweight hydration.
The ingredient is still a relative newcomer so it is not as widespread as veteran hydrators like glycerin or hyaluronic acid, yet its pleasant skin feel and compatibility with actives are helping it appear in more modern serums and creams each year.
Current research and user reports show it to be low risk with only rare sensitivity reactions. Standard cosmetic safety reviews place it in the safe to use category at typical concentrations. As with any new skin care product, it is wise to perform a small patch test to ensure personal tolerance before full-face application.