Laureth-4 (Liquid | Emulsifiers)

Laureth-4 is a critical component of the classic pearlising system comprising Glycol Distearate, Laureth-4, and Cocamidopropyl Betaine or CAPB. In this system, Laureth-4 acts as the carrier and crystal-growth modifier that helps Glycol Distearate form uniformly sized lamellar crystal structures, producing a bright, stable pearlescent effect in shampoos, shower gels, and liquid soaps.

In a standard pearlising system, Laureth-4 is typically used at 1–3% in combination with 1–3% Glycol Distearate. The exact ratio depends on the desired pearl intensity and the surfactant system. The premix is usually added to the shampoo base at 40–45°C and then cooled slowly under controlled conditions to develop the pearl.

Laureth-4 has an HLB of approximately 9.7 — intermediate between the lipophilic Laureth-2 (HLB ~6.9) and the more hydrophilic Laureth-7 (HLB ~12.1). This intermediate HLB makes it useful as a co-emulsifier in O/W systems, a primary emulsifier in some W/O systems, and a wetting/spreading agent in both aqueous and oil-continuous systems.

Yes. Laureth-4 can partially solubilise small amounts of fragrance oil in aqueous systems, particularly at higher concentrations (8–15% relative to fragrance). However, for complete solubilisation of fragrance or essential oils, higher-HLB grades like Laureth-7 or Laureth-23 at greater concentrations are typically more effective.

Yes. Laureth-4 is classified as safe for cosmetic use by the CIR Expert Panel for rinse-off applications at current industry concentrations. It is mild and non-sensitising and is widely used globally in commercial shampoos, conditioners, and shower gels.

Yes. Like other low-to-mid ethoxylate laureths, Laureth-4 provides moderate skin penetration enhancement by interacting with stratum corneum lipids. It is used in topical pharmaceutical creams and gels to improve the delivery of active ingredients. Its penetration enhancement potential is lower than Laureth-2 but more controllable, with a milder effect suitable for sensitive skin formulations.

Industrial uses include: wetting agent in agrochemical spray formulations and wettable powders, textile fibre lubricant and spreading agent, co-emulsifier in metalworking and cutting fluids, dispersant in leather finishing, and wetting agent in adhesive and coating systems.

Pharcos L4 (Laureth-4) is a clear to slightly hazy liquid or soft waxy material at room temperature with a melting point of approximately 16–22°C. It should be stored in sealed containers at room temperature, away from moisture and direct heat. It may solidify at lower temperatures, which does not affect quality.

Laureth-4 is readily biodegradable under aerobic conditions (OECD 301B compliant) and is considered environmentally acceptable for use in cosmetic and industrial formulations. It is REACH-registered and compliant with EU environmental requirements.

Pharcos Speciality provides a Certificate of Analysis (CoA), Safety Data Sheet (SDS), non-GMO and allergen-free declarations, and BSE/TSE-free certificate with each batch. Technical data sheets with application guidance are available on request for formulators and procurement teams.