Polyglycerol Fatty Acid Esters (PGFE) Formulation Optimization Case: Emulsification Phase Separation & Greasy Skin Feel Resolution

HiSiaddi is an innovative foreign trade service provider driven by both technology transformation and foreign trade operations. We have established a service system structured as "1+2+3+4=1" and can supply PGFE from multiple well-known original manufacturers. As a foreign trader with independent R&D capabilities, HiSiaddi has repeatedly collaborated with factories on technology conversion and accurately captured market demands to provide PGFE formulation optimization solutions and application improvement recommendations. Below is a case detailing our PGFE formulation optimization consulting service.

Contact HiSiaddi’s customer service if you require further formulation optimization consulting.

I. Client Background

Client: SwissNatura, Switzerland A leading European high-end organic food and natural skincare enterprise specializing in organic plant-based yogurts, luxury moisturizing creams and sugar-free protein bars, distributed through premium supermarkets and organic certified stores across Switzerland, Germany and Austria. The brand fully complies with EU E475, EU Organic, Cosmos Organic and ISO 22000 standards, requiring PGFE to deliver strong emulsification stability, low-temperature water separation resistance, high-temperature phase separation resistance, natural mildness and exceptional batch consistency. It is a mid-to-high-end client with zero tolerance for technical errors and extreme quality standards.

In March 2026, the client purchased bulk domestic PGFE (decaglyceryl stearate, HLB=12.0) for mass production of organic plant-based yogurts (oil-in-water systems) and luxury moisturizing creams (oil-in-water emulsions). Three major technical failures emerged post-production:

· Yogurt: Water separation after 7 days refrigeration, grainy texture, whey separation and loose mouthfeel

· Cream: Phase separation at 45°C, caking at -10°C, heavy greasy skin feel, slow absorption and residual film sensation

· Production line issues: Uneven emulsification, large batch viscosity fluctuations (±15%), only 78% pass rate and frequent production line shutdowns for rework

The client previously consulted the original manufacturer, who only offered vague suggestions to "adjust dosage" without professional technical analysis, targeted solutions or process optimization guidance. This stalled production, delayed orders and damaged the brand’s premium reputation. The client urgently commissioned us to complete technical diagnosis within 3 days and roll out actionable solutions within 7 days to restore stable mass production.

II. Three Core Technical Pain Points: Mismatch with High-End Formulation Systems Disrupting Production & Formulation Performance

1. Imbalanced formulation compatibility: HLB deviation and insufficient purity breaking emulsion systems

· Mismatched HLB value: The client’s yogurt and cream formulations required PGFE with HLB = 11.2±0.3, while the supplied product measured HLB=12.3 (1.1 deviation). Excessive hydrophilicity and insufficient lipophilicity destabilized oil-in-water systems, directly triggering phase separation, water bleeding and caking.

· Excessive impurities and insufficient purity: The supplied product only reached 97.8% total ester content (target ≥99.2%), free glycerol 1.2% (target ≤0.4%), acid value 1.8 mgKOH/g (target ≤0.6). Impurities including free glycerol and unreacted fatty acids disrupted emulsification interfaces, reducing stability, causing greasiness and triggering skin irritation.

· Mismatched carbon chain and polymerization degree: The product was dominated by octaglyceryl stearate, while the client’s systems required a blend of 70% decaglyceryl stearate and 30% hexaglyceryl oleate; single-component grades cannot balance low and high-temperature stability.

1. Out-of-control production processes: Incorrect emulsification sequence, temperature misalignment and insufficient shear force

· Reversed raw material addition order: The client directly added PGFE to the aqueous phase (incorrect practice) instead of pre-blending with the oil phase, causing emulsifier agglomeration, fragile interfacial films and poor dispersion.

· Incorrect emulsification temperature: Production ran at 65°C (below the optimal PGFE emulsification window of 75–80°C), leading to incomplete emulsification, oversized emulsion droplets (≥5μm vs. target ≤2μm) and drastically reduced stability.

· Insufficient shear strength: Only low-speed stirring (300rpm) was used instead of high-shear homogenization (1500–2000rpm), resulting in uneven droplet size and rapid coalescence/separation.

· Excessively fast cooling rate: Direct rapid cooling with cold water (15°C/min) created uneven crystallization and internal system stress, leading to low-temperature caking.

1. Subpar application performance: Poor stability, unfavourable sensory properties and severe batch variations

· Extremely weak temperature stability: Yogurt water separation rate ≥8% after 7 days refrigeration at 4°C (target ≤2%); cream phase separation after 48 hours at 45°C and caking after 24 hours at -10°C.

· Poor mouthfeel and skin feel: Heavy greasy cream texture, slow absorption and persistent oil film; grainy yogurt texture with weak dairy aroma and loose consistency.

· Severe batch inconsistency: Viscosity fluctuated ±15% across batches with inconsistent emulsification stability, unacceptable for premium market quality standards.

III. HiSiaddi Technical Breakthrough: Full-Spectrum Diagnosis, Formulation, Process & QC Optimization Within 7 Days

(1) 24-Hour Precise Diagnosis: Identify Root Causes & Core Conflicts

Our dual technical team (food emulsifier + cosmetic formulation specialists) immediately coordinated with the client and completed full-dimensional diagnosis within 24 hours:

· Product testing: Sampled the original PGFE and confirmed HLB=12.3, total ester 97.8%, free glycerol 1.2%, acid value 1.8 and droplet size 5–8μm, with severe purity and HLB non-compliance.

· Formulation review: Verified the client’s target HLB of 11.2±0.3, unachievable with single-grade PGFE and requiring blended modification.

· On-site production audit: Identified four critical process errors: incorrect addition sequence, suboptimal emulsification temperature, inadequate shear force and overly fast cooling. Conclusion: The root causes were misselected PGFE grade, insufficient purity and mismatched production processes, whose combined effects collapsed emulsion stability and degraded functional performance.

(2) Targeted Formulation Optimization: HLB Blending, Purity Upgrade & Dual-System Compatibility

Grade blending to lock in precise HLB: Abandoned the original single-grade PGFE in favour of a 70:30 blend of decaglyceryl stearate (PG10S, HLB=12.5) and hexaglyceryl oleate (PG6O), with a measured HLB of 11.15 (0.15 deviation, perfectly matching the client’s systems). High-purity raw material replacement for strict impurity control: Switched to high-end dual food/cosmetic-grade PGFE from Jiangsu Haixing, with total ester ≥99.5%, free glycerol ≤0.3%, acid value ≤0.5 and peroxide value ≤0.3, drastically cutting impurity levels. Adjusted dosage to balance stability and sensory properties:

· Yogurt: Loading reduced from 0.8% to 0.6% to minimize greasiness and improve fluidity

· Cream: Loading reduced from 2.0% to 1.5% to eliminate film residue and accelerate absorption Auxiliary ingredient optimization:

· Yogurt: Added 0.1% pectin for synergistic stabilization to suppress whey separation

· Cream: Added 0.2% natural vitamin E for antioxidant protection and enhanced high-temperature stability

(3) Standardized Production Processes: Four Key Regulated Operational Parameters

Corrected emulsification sequence (core priority): Correct workflow: Pre-blend PGFE with oil phase lipids/vegetable oils at 75°C for 10 minutes → slowly add pre-heated 75°C aqueous phase → high-shear homogenization → slow cooling. Strictly prohibit direct addition of PGFE to the aqueous phase to avoid agglomeration. Precise temperature control matching the optimal emulsification window:

· Emulsification temperature: 78°C±2°C (optimal reaction range for complete emulsification and consistent colour)

· Holding time: 20 minutes to ensure interfacial film formation and fine droplet refinement

· Cooling rate: 2°C/min slow cooling for uniform crystallization and minimal internal stress Enhanced shear force to refine emulsion droplets: Operate high-shear homogenizer at 1800rpm for 15 minutes to control droplet size ≤2μm for uniform texture and superior stability. Batch quality control to lock in consistency: Test HLB, purity, viscosity, emulsification stability and droplet size for every batch, limiting inter-batch fluctuations to ≤3%.

(4) Lab Trials + Pilot Production Rollout: Full-Scale Validation to Eliminate Risks

2-day laboratory small-batch trials following optimized formulations and processes delivered the following results:

· Yogurt: 1.2% water separation rate after 7 days at 4°C (compliant with ≤2% target), smooth texture and rich creamy mouthfeel

· Cream: No phase separation after 48 hours at 45°C, no caking after 24 hours at -10°C, lightweight fast-absorbing texture with zero film residue

· Droplet size: Uniform 1.2–1.8μm for exceptional stability 3-day on-site client pilot production: Guided production of 500kg yogurt and 300kg cream with real-time parameter monitoring and adjustments. Production pass rate rose to 98.5% with viscosity fluctuations limited to ±2.8%. Client blind test feedback: "Mouthfeel and skin feel are drastically improved; stability fully meets requirements and outperforms the original product."

(5) Technical Training & Standardized Documentation: Long-Term Stable Support

On-site technical training: Delivered a 4-hour specialized training session for the client’s R&D, production and QC teams covering PGFE grade selection logic, HLB matching principles, formulation optimization techniques, core production process parameters, QC standards and troubleshooting for common failures. Standardized documentation output: Supplied English-language documents including the PGFE Selection & Formulation Optimization Guide, Standardized Production Process SOP and Batch QC Testing Standards for the client’s team. Remote technical standby: Provided 72-hour post-pilot remote technical support to resolve production queries in real time and guarantee stable process execution.

IV. Project Outcomes: Full Resolution of Technical Failures, Boosted Product Quality & Production Efficiency

1. Fully compliant product performance exceeding client expectations

· Yogurt: 1.2% water separation after 7 days refrigeration at 4°C, smooth creamy texture, enhanced dairy aroma and shelf life extended to 21 days

· Cream: No phase separation at 45°C for 48 hours, no caking at -10°C for 24 hours, lightweight fast-absorbing texture with zero film residue and zero irritation for sensitive skin

· Long-term stability: No phase separation, discoloration or odour shift after 6 months ambient storage

· Batch consistency: Viscosity fluctuations limited to ±2.8% with a 98.5% production pass rate, fully meeting premium market requirements

1. Significantly improved production efficiency and cost optimization

· Pass rate uplift: 78% → 98.5%, 90% reduction in rework volume

· Production downtime: Weekly rework downtime cut from 8 hours to 0.5 hours, 12% capacity increase

· Energy consumption: 8% lower energy usage post-process optimization

· Cost benefits: Combined raw material replacement and process optimization delivered a 5% reduction in overall costs while improving product quality

1. Resumed client order fulfilment and strengthened premium brand reputation

· Production resumption: Stable monthly supply of 10 tons post-pilot production with on-time order delivery

· Market feedback: Zero quality complaints post-launch, 20% higher repeat purchase rate at premium supermarkets Client testimonial: "HiSiaddi is far more than a supplier—we view you as a professional technical partner. You resolved technical issues that plagued us for months within 7 days, delivering precise formulation and process optimization with product performance and production stability exceeding all expectations. Your team is professional, reliable and our preferred long-term collaborator."

1. Long-term technical cooperation locking in premium supply chain

· Annual framework agreement: Client signed a 30-ton annual procurement contract specifying HiSiaddi’s recommended blended PGFE and standardized processes as exclusive production standards

· Deep technical partnership: Appointed HiSiaddi as exclusive Chinese technical consultant for PGFE grade selection, formulation optimization, process upgrades and new product R&D full-cycle technical support

· Global market expansion: The client incorporated the optimized PGFE formulations and processes into its global premium product standards, rolling out across multiple European countries, establishing a benchmark case for Chinese PGFE technical services empowering European premium brands.

V. Case Summary

The core technical pain point for overseas mid-to-high-end clients purchasing PGFE lies in "mismatched product selection, non-standard production processes and imprecise formulation compatibility". Premium food and skincare products impose strict requirements on HLB value, purity, temperature stability, sensory properties and batch consistency. Conventional manufacturers only supply single product grades without professional formulation matching capabilities, standardized production guidance or post-sales technical support, triggering frequent production failures, capacity shutdowns and reputational damage after mass production launch.

HiSiaddi’s core value lies in "professional technical diagnosis + precise formulation optimization + standardized process implementation + long-term technical empowerment". We possess in-depth expertise on PGFE structure-performance correlations, HLB matching logic and high-end emulsification system principles, alongside comprehensive familiarity with European premium food and skincare production processes and QC standards. We rapidly identify root failure causes, design exclusive targeted solutions, guide on-site implementation, deliver standardized documentation and train client teams to eliminate technical risks within 7 days, restore stable mass production, elevate product quality, optimize production costs, break technical bottlenecks, strengthen premium brand reputation, boost market competitiveness and secure long-term supply chain partnerships.

Contact HiSiaddi’s customer service for further formulation optimization consulting.