How is PHA manufactured?

PHA is manufactured through a 5-step process: (1) bacterial strain screening and cultivation, (2) fermentation in bioreactors where bacteria accumulate PHA granules, (3) extraction and purification of PHA from cells, (4) compounding and pelletization into specialized formulations, and (5) conversion into finished products via injection molding, blown film, thermoforming, or coating. PHApack performs all 5 steps in-house.

What makes PHApack's manufacturing process different?

PHApack uses Chinese indigenous bacterial strains adapted to local fermentation conditions, achieving 15-20% higher productivity than imported strains. Our green solvent extraction achieves 99.5% purity without chloroform. We maintain 50+ proprietary formulations and perform full vertical integration from strain to finished product, ensuring quality control at every step.

What is the minimum order quantity for PHA pellets?

Standard MOQ for PHA pellets is 500kg per formulation. Trial orders from 100kg are available for evaluation and testing. For custom formulation development, a minimum development order of 200kg applies. Lead time is 15-25 days for standard grades.

Can PHApack develop a custom PHA formulation?

Yes. PHApack's R&D team develops custom formulations tailored to specific MFI requirements, degradation timelines, mechanical properties, and processing conditions. We currently maintain 50+ formulations and can create new ones within 4-6 weeks including testing and certification support.

Is PHA production sustainable?

Yes. PHA is produced from renewable carbon feedstock (glucose, glycerol, or waste cooking oil) via bacterial fermentation. The process uses no petroleum, generates no toxic byproducts, and our green solvent extraction recovers over 95% of solvents in a closed-loop system. The final product biodegrades completely in soil, marine, and compost environments.

PHA Manufacturing Process | From Strain to Finished Product

Why Manufacturing Process Matters

Not all PHA is created equal. The quality, consistency, and performance of PHA products depend entirely on how they are manufactured — from the bacterial strain used to the extraction method to the final processing parameters. Most PHA suppliers outsource multiple steps of production, leading to quality gaps and supply chain fragility.

PHApack is one of the few manufacturers worldwide with complete vertical integration: from strain cultivation to finished products, all under one roof. This guide walks you through our 5-step manufacturing process and explains why each step matters for product quality.

The 5-Step PHA Manufacturing Process

Strain Screening & Cultivation

PHApack maintains a proprietary library of Chinese indigenous bacterial strains optimized for high PHA yield. Unlike imported strains, our native strains are adapted to local fermentation conditions, reducing contamination risk and improving productivity by 15-20%.

50+ proprietary strains in our culture library
Chinese indigenous strains adapted to local conditions
Non-GMO strains for food-grade applications
Continuous strain improvement program via adaptive evolution
PHA accumulation rate: 70-85% of cell dry weight

Fermentation & Biosynthesis

Selected strains are cultivated in large-scale bioreactors (up to 200,000L) using renewable carbon feedstock. Fed-batch fermentation with dissolved oxygen and pH control maximizes PHA intracellular accumulation over 48-72 hour cycles.

Fed-batch fermentation in 200,000L bioreactors
Carbon sources: glucose, glycerol, or waste cooking oil
Fermentation cycle: 48-72 hours
Temperature control: 30-37°C depending on strain
PHA content reaches 70-85% of cell dry weight

PHA Extraction & Purification

PHA granules are extracted from bacterial cells using our proprietary green solvent extraction process. This avoids harsh chemicals like chloroform, achieving 99.5% purity while maintaining polymer molecular weight and thermal properties.

Green solvent extraction (no chloroform, no hypochlorite)
Purity: 99.5% (HPLC verified)
Molecular weight preservation: Mw > 500,000 Da
Endotoxin removal for medical/food-grade applications
Solvent recovery rate: >95% (closed-loop system)

Compounding & Pelletization

Pure PHA resin is compounded with bio-based additives, nucleating agents, and processing aids to create 50+ specialized formulations. Twin-screw extrusion produces uniform pellets optimized for specific downstream processing methods.

50+ proprietary formulations for different applications
Twin-screw extrusion at 150-170°C
MFI range: 0.5-50 g/10min (tailored per grade)
Bio-based plasticizers and nucleating agents only
Pellet size: 2-3mm uniform diameter

Finished Product Manufacturing

PHA pellets are converted into finished products using four core processing technologies: injection molding, blown film extrusion, thermoforming, and coating/lamination. All production occurs in-house for full quality control.

Injection molding: cutlery, containers, caps
Blown film: bags, packaging film, agricultural film
Thermoforming: cups, trays, clamshells
Coating: paper cup lining, barrier coatings
Annual capacity: 10,000+ tons finished products

PHApack's Differentiation: Chinese Indigenous Strains

Most PHA manufacturers use imported strains from European or American culture collections. These strains were isolated in different climates and often underperform when transferred to Asian fermentation conditions. PHApack took a different approach: we isolated and optimized bacterial strains from Chinese soil and water environments over 8 years of R&D.

Indigenous Strain Advantages

15-20% higher PHA productivity vs imported strains
Adapted to local temperature and humidity conditions
Lower contamination risk in open fermentation systems
Non-GMO status maintained for food-grade certification
Continuous improvement via adaptive laboratory evolution

50+ Formulations: One Resin, Every Application

Pure PHA resin cannot be used directly for all applications. Different processing methods require different melt flow indices, mechanical properties, and thermal behaviors. PHApack maintains over 50 proprietary formulations, each optimized for a specific downstream process:

Grade Series	Process	MFI	Applications	Key Features
PHA-INJ Series	Injection Molding	5-20 g/10min	Cutlery, containers, caps, closures	High stiffness, heat resistant to 100°C
PHA-BF Series	Blown Film	0.5-3 g/10min	Garbage bags, shopping bags, dog poop bags	High elongation, tear resistant, sealable
PHA-EX Series	Extrusion/Sheet	1-5 g/10min	Straws, profiles, sheet for thermoforming	Melt strength optimized, uniform wall thickness
PHA-TF Series	Thermoforming	2-8 g/10min	Cups, trays, clamshells, lids	High clarity, good forming depth
PHA-CT Series	Coating/Lamination	10-50 g/10min	Paper cup coating, barrier films	Low viscosity, excellent adhesion to paper
PHA-AG Series	Blown Film (UV stabilized)	0.5-2 g/10min	Agricultural mulch film	UV stabilized, controlled soil degradation

Need a custom formulation? Our R&D team can develop new grades within 4-6 weeks, including MFI optimization, additive packages, and certification support. Explore our PHA pellet range →

Vertical Integration: Why It Matters for Buyers

PHApack's 7-layer vertical integration (strain → fermentation → extraction → compounding → injection molding → blown film → thermoforming/coating) delivers concrete advantages for OEM/ODM buyers:

Quality control: Every batch is traceable from strain lot to finished product
Cost efficiency: No middleman margins at any production step
Speed: Custom formulations from lab to production in 4-6 weeks
Flexibility: Switch between product types without changing suppliers
IP protection: Your custom formulation stays in-house, never shared with third parties

Learn more about our full capabilities on our About page →

Quality Certifications at Every Step

Each manufacturing step is validated against international standards. Our extraction process is verified for food-contact safety (FDA 21 CFR, EU 10/2011). Finished products carry TUV OK Compost HOME, OK Compost INDUSTRIAL, OK Compost MARINE, BPI, and DIN CERTCO certifications. Every batch ships with a Certificate of Analysis including MFI, molecular weight, purity, and biodegradation test references.

PHA Manufacturing Process: From Strain to Finished Product