SQ-SIL 1.5 (Dimethicone 1.5cst) – Low Viscosity D5 Substitute with <0.1% Cyclic Residues, EU Compliant, Light Skin Feel

Less Than One Year Until D5 Ban — How to Choose an Alternative?

On May 17, 2024, the European Commission published Regulation (EU) 2024/1328, amending Entry 70 of REACH Annex XVII. Effective June 6, 2026, D4, D5, and D6 at concentrations ≥0.1% in substances, as components, or in mixtures shall not be placed on the EU market. This new regulation replaces the previous restriction that only applied to rinse-off products and extends control to nearly all consumer goods.

D5 has been classified as a Substance of Very High Concern (SVHC). For brands targeting the EU market, D5 is no longer an option—it is a compliance challenge that must be addressed. With less than a year to go, choosing the right alternative is urgent. SQ-SIL 1.5 is the answer you've been looking for.

Why SQ-SIL 1.5? — Not Just a Replacement, But an Upgrade

1. EU Compliant, Zero Risk.

SQ-SIL 1.5 has total cyclic residues (D4+D5+D6) <0.1%, fully meeting REACH limits. Whether exporting to the EU or coping with increasingly stringent global siloxane regulations, you have nothing to worry about.

2. Ultra-Low Viscosity, Water-Like Spread.

With a viscosity of just 1.5 cSt at 25°C — thinner than water — SQ-SIL 1.5 delivers unmatched spreadability and penetration. It spreads instantly over the skin, leaving an ultra-light, silky, non-greasy feel.

3. Moderate Volatility, Lasting Sensation.

Unlike some highly volatile silicone oils, SQ-SIL 1.5 has a volatility profile comparable to D5 — it neither disappears instantly nor lingers too long. It stays on skin or hair for just the right amount of time, delivering lasting silkiness.

4. High Purity, Stable and Reliable.

Purity ≥99.0%, colorless transparent liquid. High purity ensures formulation stability and avoids impurities interfering with color or fragrance.

Why Choose SQ‑SIL 1.5 Over D5? A Side‑by‑Side Look

Rather than passively responding to regulations, take the initiative to upgrade your formulations. Moving away from D5 is not a sacrifice in performance — it’s replacing an outdated choice with a superior solution. Below is a direct comparison between D5 and SQ‑SIL 1.5 across regulatory compliance, physicochemical properties, and application performance.

SQ‑SIL 1.5 not only completely avoids the global restrictions facing D5, but also delivers faster spreading, a lighter skin feel, and more stable formulation performance thanks to its lower viscosity and comparable volatility. It retains the moderate volatility and silky sensorial qualities that formulators valued most in D5, while completely eliminating the environmental and health concerns associated with cyclic silicones.

Applications: The Lightweight Choice Everywhere

SQ-SIL 1.5 is compatible with most cosmetic ingredients and is widely suitable for:

• Skincare: serums, lotions, creams, sunscreens – imparting a light, silky skin feel without clogging pores.
• Hair Care: shampoos, conditioners, styling products – enhancing smoothness, reducing frizz, leaving no residue.
• Color Cosmetics: foundations, powders, primers – improving spreadability and creating a natural matte finish.
• Antiperspirants/Deodorants: as a volatile carrier, helping active ingredients distribute evenly, evaporating quickly without leaving white marks.

Formulation Recommendations:

1. Lightweight Hydrating Serum

Process: Mix Phase A thoroughly; heat Phase B to 70°C with mixing; add Phase B to Phase A under agitation, homogenize; cool to 40°C and add Phase C.

The Gold Standard for D5 Replacement

When the era of D5 ends on June 6, 2026, SQ-SIL 1.5 already has the answer for you. It is not just a D5 alternative — it is the new benchmark for low viscosity Dimethicone, the premier cyclopentasiloxane replacement, and the ultimate volatile silicone alternative solution. Don't wait any longer. Choose SQ-SIL 1.5 for your formulations today and embrace a compliant, lightweight, and superior new future for cosmetics.