Temperature-Resistant PP Filter Cartridge: Filter Cartridge for Ointment and Cream Production Process Liquids

Product Introduction

This temperature-resistant PP filter cartridge is a professional high-performance filtration component custom-engineered for the purification of process liquids in ointment and cream production, manufactured with high-purity food-grade heat-modified polypropylene (PP) raw materials and advanced high-temperature resistant winding technology, in full compliance with FDA 21 CFR 177.1520, EU REACH and pharmaceutical daily chemical production safety standards. Adopting an adhesive-free hot-melt integral structural design, the cartridge forms a stable three-dimensional porous filtration structure through precise winding of high-temperature resistant PP fiber yarns, eliminating secondary pollution risks from chemical additives, binders or leachable substances even under high-temperature working conditions. Specifically designed for the unique characteristics of ointment and cream process liquids—including high viscosity, high production temperature, and trace insoluble particulate impurities—it efficiently removes suspended solids, fine particulates, colloidal substances, fiber residues and micro-scale solid impurities from various hot process liquids (such as oil phase, water phase, and emulsion base liquids) in ointment and cream production. The product maintains excellent structural stability and filtration performance in a high-temperature operating range, is perfectly matched with standard filter housings in the daily chemical and pharmaceutical ointment production industry, and realizes continuous, stable and high-efficiency filtration for hot process liquids, laying a solid foundation for the production of smooth, delicate, uniform and high-quality ointment and cream finished products with no particulate impurities.

Filtration Precision

Targeting the graded filtration needs of different process links and different viscosity process liquids in ointment and cream production, this temperature-resistant PP filter cartridge provides a full range of precise and customizable filtration precision options, with nominal filtration ratings ranging from 3 μm to 60 μm. The 3 μm, 5 μm and 10 μm high-precision models are suitable for the fine filtration of low-to-medium viscosity hot emulsion base liquids and finished ointment/cream semi-finished liquids, achieving efficient interception of submicron fine particulates and colloids to ensure the delicate and smooth texture of finished products; the 20 μm, 30 μm and 40 μm medium-precision models are applied to the filtration of hot oil phase and water phase base liquids in the batching stage, effectively removing medium-sized particulate impurities and fiber residues to reduce the filtration load of subsequent fine filtration links; the 50 μm and 60 μm coarse-precision models are used for the pre-filtration of high-viscosity hot raw material liquids (such as vegetable oil, petroleum jelly base liquids) with high particulate content, removing large solid impurities and preventing pipeline and filter housing blockage. All precision models maintain stable and consistent interception efficiency under high-temperature operating conditions (≤80℃), with no particle leakage or filtration precision attenuation, fully meeting the stringent filtration quality requirements of the ointment and cream production industry for hot process liquids.

Flux

The flux performance of this temperature-resistant PP filter cartridge is optimized for the high-temperature, high-viscosity characteristics of ointment and cream process liquids and the industrial production efficiency requirements, with a pure water flux of 50-110 L/min·m² at 60℃ (the mainstream production temperature) and 0.1MPa operating pressure. For the standard 10-inch cartridge, the pure water flux at 60℃ reaches 7-15 L/min; the 20-inch cartridge is 14-30 L/min, and the 40-inch large-specification cartridge can reach 28-60 L/min. For hot oil phase/water phase base liquids with normal viscosity (≤100 mPa·s) in ointment production, the actual working flux is 4-10 L/min for 10-inch cartridges and 8-20 L/min for 20-inch cartridges; for high-viscosity hot emulsion base liquids (≤200 mPa·s), the actual flux is moderately reduced to 2-6 L/min for 10-inch cartridges. The flux remains stable and predictable in the recommended high-temperature and low-pressure operating range, with no sudden attenuation, and the flux design is perfectly matched with the batch and continuous production characteristics of ointment and cream process liquids, ensuring efficient filtration while avoiding excessive shearing force that may damage the emulsion structure of the process liquids.

Salt Rejection Rate

As a dedicated temperature-resistant particulate filtration cartridge for ointment and cream production process liquids, the product is designed for the interception and removal of insoluble solid impurities, colloids and fiber residues in hot process liquids, and does not have a desalination or ion removal function, with a salt rejection rate close to 0%. It neither intercepts soluble active ingredients, humectants, emulsifiers, preservatives and other functional components in aqueous process liquids nor affects soluble oil-soluble active ingredients, emollients and waxes in oil phase process liquids, ensuring that the chemical composition, formula ratio and functional properties of ointment and cream process liquids remain completely unchanged during the high-temperature filtration process. The abandonment of desalination design is a core structural feature that makes the cartridge specialized for particulate removal in hot process liquids for ointment and cream production, distinguishing it from water purification filter cartridges with desalination functions and ensuring the integrity of the ointment and cream formula and product performance.

Pressure Drop

The product adopts an optimized low-resistance high-temperature resistant winding structure and large-pore gradient filtration channel design, with an initial pressure drop of ≤0.015MPa at 60℃ and rated pure water flux for all filtration precision specifications. This low initial pressure drop effectively reduces the energy consumption of the hot process liquid delivery pump in ointment and cream production lines, avoids the damage of excessive pressure to the emulsion structure of hot process liquids, and prevents the local overheating and deterioration of raw materials caused by high-pressure shearing. With the progress of filtration, the pressure drop of the cartridge gradually increases as the three-dimensional filtration layer intercepts more impurities; the recommended terminal operating pressure drop is ≤0.08MPa even under high-temperature working conditions (60-80℃). When the pressure drop exceeds this value, the filtration flux will decrease significantly, and the cartridge needs to be cleaned or replaced in time to avoid excessive system pressure that may cause the re-leakage of intercepted impurities and affect the purity of process liquids, ensuring the smooth progress of ointment and cream production and hot process liquid filtration.

Molecular Weight Cutoff (MWCO)

Combined with the filtration precision, high-temperature resistant winding density and the component molecular characteristics of ointment and cream process liquids, the optimized Molecular Weight Cutoff (MWCO) range is 60,000 Da to 400,000 Da for this temperature-resistant PP filter cartridge. This MWCO range is precisely tailored to the high-temperature filtration needs of ointment and cream process liquids: it can effectively intercept macromolecular colloids, micro-scale fiber polymers, solid impurity aggregates, macromolecular waxy precipitates and insoluble polymer impurities (MW > 60,000 Da) in hot oil phase, water phase and emulsion process liquids, while allowing all small and medium molecular weight active ingredients, emulsifiers, emollients, humectants and soluble additives (MW < 60,000 Da) in ointment and cream process liquids to pass through smoothly. Even under high-temperature working conditions, the MWCO range remains stable with no deviation, achieving the dual goal of efficient impurity removal and complete retention of functional components in hot process liquids, and ensuring that the filtered process liquids fully meet the formula and production requirements of ointment and cream products.

Membrane Thickness

This temperature-resistant PP filter cartridge adopts a gradient thickness high-temperature resistant filtration layer design adapted to the high-temperature and high-viscosity characteristics of ointment and cream process liquids, with an effective functional filtration layer thickness of 4-9 mm, and the total outer diameter thickness of the cartridge (including high-strength heat-modified PP inner core and gradient filtration layer) is a standard 28-30 mm, fully compatible with the installation size of standard filter housings in the ointment and cream production industry. The filtration layer is composed of a loose outer layer (2-4 mm) with large pore size for coarse interception of large particulate impurities in hot process liquids, a medium-density middle layer (1-2 mm) for interception of medium-sized particulates and colloids, and a dense inner layer (1-3 mm) for fine interception of small fine particulates, forming a multi-layer gradient thickness filtration structure reinforced by high-temperature hot-melt technology. This structural design not only maximizes the dirt-holding capacity and filtration efficiency of the cartridge under high temperature but also ensures excellent mechanical stability; the uniform thickness distribution of the whole filtration layer avoids local excessive pressure and filtration layer damage caused by the scouring of high-viscosity hot process liquids, and adapts to the long-term continuous filtration demand of ointment and cream hot process liquids.

Replacement Cycle

The replacement cycle of this temperature-resistant PP filter cartridge is determined by the impurity content, viscosity and temperature of ointment and cream process liquids, daily filtration volume and system pressure drop, with a recommended normal replacement cycle of 1-4 weeks for the filtration stage of hot process liquids in ointment and cream production enterprises. For low-viscosity, low-impurity hot emulsion base liquids and intermittent production conditions, the replacement cycle can be appropriately extended to 3-4 weeks (50/60 μm models) and 2-3 weeks (3/5 μm models); for high-viscosity, high-impurity hot raw material liquids (such as vegetable oil base liquids) and 24-hour continuous high-temperature production lines, the replacement cycle is shortened to 1-2 weeks for all precision models. In addition, the cartridge must be replaced immediately if any of the following conditions occur: the terminal pressure drop exceeds 0.08MPa (even at room temperature), the filtration flux drops by more than 30% of the initial value and cannot be recovered after physical cleaning (such as backwashing with hot purified water), or the filtered process liquids appear particulate sedimentation or emulsion stratification, to ensure the stable purity of ointment and cream process liquids and the normal progress of production.

Features

High-purity heat-modified PP material: The whole cartridge is made of FDA/EU REACH certified food-grade heat-modified polypropylene, with excellent high-temperature resistance, maintaining stable physical and chemical properties in the temperature range of 0-80℃, no deformation, no softening and no leachable substances, meeting the strict safety and hygiene requirements of ointment and cream production.
Adhesive-free hot-melt integral structure: The advanced high-temperature resistant winding process with integral hot-melt bonding eliminates any adhesives or binders, avoiding the dissolution of chemical additives into hot process liquids at high temperature and ensuring the purity of ointment and cream raw materials.
Gradient three-dimensional filtration layer: The outer coarse, middle medium and inner fine gradient porous structure realizes multi-stage interception of impurities of different particle sizes in hot process liquids, greatly improves the dirt-holding capacity and filtration efficiency, and reduces the replacement frequency of the cartridge under high-temperature working conditions.
Excellent chemical compatibility under high temperature: Resistant to most oil-soluble solvents, water-based solvents, weak acids, weak alkalis, emulsifiers, vegetable oils and mineral oils commonly used in ointment and cream production, and maintains stable compatibility even at high temperature, adapting to the filtration of all types of hot process liquids.
High temperature stability & mechanical strength: Reinforced by high-temperature hot-melt technology, the integral structure has excellent compressive and tensile strength, no fiber shedding, no structure damage and no filtration precision attenuation under high temperature (≤80℃) and recommended operating pressure (0-0.4MPa), adapting to the harsh production environment of hot process liquid filtration.
Standard industrial specification design: The standard 28-30 mm outer diameter and mainstream 10/20/30/40-inch length specifications are perfectly matched with standard filter housings in the ointment and cream production industry, realizing quick installation, disassembly and replacement, and reducing the downtime of high-temperature production lines.
Washable with hot water: The heat-modified PP filtration layer is resistant to high-temperature water washing, and can be physically cleaned with hot purified water (50-60℃) for repeated short-term use, further reducing the production operation cost of enterprises.
Environmentally friendly & recyclable: The monolithic heat-modified PP material structure has no mixed materials, and the discarded cartridges can be recycled and reused in accordance with plastic waste treatment standards, meeting the green production requirements of the modern daily chemical and pharmaceutical industry.

Application Fields

This temperature-resistant PP filter cartridge is specially developed for the ointment and cream production industry (including daily chemical and pharmaceutical fields), and is widely applied to the filtration stage of various hot process liquids in ointment and cream production, covering all core production links with high-temperature process requirements: filtration of hot oil phase base liquids (vegetable oil, mineral oil, petroleum jelly) in the batching stage; filtration of hot water phase base liquids (humectant solution, emulsifier solution) for aqueous ointments and creams; fine filtration of hot emulsion base liquids after emulsification and homogenization; filtration of hot semi-finished liquids of finished ointments and creams before cooling and filling; pre-filtration of high-viscosity hot raw material liquids for oil-based ointments; filtration of hot process liquids for medical ointments (such as anti-bacterial ointments, anti-inflammatory ointments) with pharmaceutical grade requirements; filtration of hot process liquids for daily chemical skin care creams (moisturizing cream, anti-aging cream, sunscreen cream) and body ointments; and filtration of hot cleaning water for ointment and cream production equipment, pipelines and emulsification kettles. In addition, the product can also be used for the high-temperature filtration of process liquids in the production of other semi-solid daily chemical products such as facial masks, body butters and hair creams, complying with the industry production standards in all application scenarios, and is an indispensable core filtration component for the production of high-quality ointment and cream products.

Conclusion

In summary, this temperature-resistant PP filter cartridge is a high-performance dedicated filtration product tailored for the hot process liquids in ointment and cream production, with the core advantages of excellent high-temperature resistance, graded filtration precision options, low pressure drop, stable MWCO setting, and high mechanical strength under high temperature. Based on the food-grade heat-modified PP material and adhesive-free hot-melt integral structure, the product maintains perfect structural stability and filtration performance in the high-temperature operating range (0-80℃), and efficiently removes all insoluble particulate impurities, colloids and fiber residues in hot oil phase, water phase and emulsion process liquids on the premise of complete retention of functional components and emulsion structure of the process liquids. It significantly improves the purity and uniformity of ointment and cream process liquids, ensures the smooth, delicate and impurity-free texture of finished products, and effectively prevents pipeline blockage and equipment wear caused by particulate impurities in hot process liquids. The low initial pressure drop design avoids the damage of excessive pressure to the emulsion structure of hot process liquids, and the standard industrial specification design makes it fully compatible with the mainstream filter equipment in the ointment and cream production industry, adapting to the batch and continuous production characteristics of the industry. The washable and reusable characteristics and flexible replacement cycle further reduce the production operation cost of enterprises. As a professional filtration component complying with FDA and EU REACH standards, it effectively solves the industry pain point of stable and efficient filtration of high-temperature and high-viscosity process liquids in ointment and cream production, and is a reliable, cost-effective and high-efficiency filtration solution for daily chemical and pharmaceutical ointment and cream production enterprises of all scales. It provides strong technical support for the production of high-quality, safe and high-performance ointment and cream products, and is the first choice for the filtration of hot process liquids in the ointment and cream production industry.

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