Best For Skin Types
All
Addresses
Usage Frequency
As part of regular product use
What Is Hdi …?
HDI/PPG/Polycaprolactone Crosspolymer is a synthetic polymer used primarily as an anticaking agent in cosmetic powders. It is formed through the chemical crosslinking of polycaprolactone (a polyester) with HDI (hexamethylene diisocyanate) and PPG (polypropylene glycol), creating a network structure that resists clumping.
In skincare products, this ingredient works to maintain the flow and texture of powdered formulations, preventing moisture absorption and the formation of lumps that can compromise product performance and application.
How It Works
The crosspolymer structure creates a hydrophobic (water-repelling) network that forms a protective film around powder particles. This reduces particle-to-particle adhesion, which is the primary cause of caking in powder formulations.
Because it resists moisture absorption, the ingredient helps powders maintain their original texture and flowability over time, even when exposed to humidity or stored in damp conditions.
Clinical Evidence & References
This ingredient has a long history of safe use in cosmetics and is well-established in formulation chemistry. However, direct clinical evidence on skin benefits is limited because it functions primarily as a formulation aid rather than an active skincare agent.
Its role is to optimise product performance and stability rather than to deliver therapeutic effects to the skin. Regulatory bodies including the INCI Committee and cosmetic safety authorities consider it a safe indirect contributor to product quality.
How to Use
This ingredient is typically found in powder-based products such as pressed powders, loose powders, and powder foundations. There is no specific usage guidance for consumers, as the ingredient's function is transparent to the user – you simply benefit from a product that applies smoothly and maintains its texture.
Safety & Precautions
Frequently Asked Questions
From the Clinic
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Hydrogenated Palm Acid
A thickening agent derived from hydrogenated palm oil with opacifying properties
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