Two-Component PUR Adhesive for Industrial RO Filter Elements

Application Overview

SINOHESIVE two-component PUR adhesive for industrial RO filter elements is designed for bonding RO membrane sheets and winding industrial reverse osmosis membrane elements.It is suitable for demanding water-treatment applications such as seawater desalination, where hydrolysis resistance and chemical resistance are important.The adhesive consists of Part A and Part B and can be processed with automatic mixing equipment using either static or dynamic mixing methods, helping ensure stable adhesive application and structural bonding during membrane winding.

Environmental Compliance & Potable Water Applications

The product is an environmentally friendly two-component polyurethane adhesive designed to meet hygiene and safety requirements for potable water applications, as well as relevant NSF, FDA, RoHS, and REACH requirements.It can be considered for membrane bonding projects involving drinking-water contact and other applications where food-safety and hygiene requirements are important.Specific compliance should be confirmed according to the target market, final product configuration, and applicable regulations.

Key Benefits

Designed for RO Membrane Winding

The adhesive is primarily used for bonding RO membrane sheets and provides good compatibility with most membrane materials commonly used in the market.It supports industrial RO membrane winding and can help reduce the risk of tunneling during membrane element production.

High Penetration

The adhesive provides high penetration and is suitable for demanding applications such as seawater desalination.For certain membrane constructions, it can help reduce capillary-related defects and blistering. Actual performance should be verified based on membrane type, winding structure, and processing conditions.

Hydrolysis, Acid & Alkali Resistance

After curing, the adhesive layer provides good hydrolysis resistance and chemical resistance.It shows low weight loss under acidic and alkaline conditions ranging approximately from pH 1 to 13, helping support long-term reliability of industrial RO membrane elements under demanding water-treatment conditions.

Medium Viscosity for Stable Mixing and Dispensing

After mixing, the adhesive has a viscosity of approximately 12,000 mPa·s at 25°C, making it suitable for automatic mixing systems using static or dynamic mixing.Part A and Part B can be mixed at A = 1:1 by volume or A = 1:1.1 by weight.The pot life is approximately 40 minutes under standard conditions.

Suitable for Subsequent Processing After Curing

The adhesive can proceed to the next processing stage after approximately 3 hours of curing at 50°C or about 8 hours at room temperature.Because two-component polyurethane adhesives do not provide high initial tack, appropriate pressure should be applied after adhesive application to ensure sufficient filling and contact at the bonding interface.

Application Support for Your Industrial RO Filter Project

Final membrane winding performance can be affected by membrane type, membrane moisture condition, mixing ratio, degassing condition, adhesive application amount, winding structure, pressing conditions, and curing environment.

SINOHESIVE can provide sample testing and adhesive selection support based on your specific project requirements, helping you complete the necessary validation before full-scale production.

• Material compatibility evaluation based on RO membrane type, filter element structure, and target water-treatment conditions

• Process recommendations based on automatic mixing, static or dynamic mixing, and membrane winding cycle requirements

• Guidance on Part A/Part B mixing ratio, pot life, degassing, adhesive application, and pressing conditions

• Sample testing and comprehensive evaluation of membrane bonding performance, tunneling control, hydrolysis resistance, acid and alkali resistance, and chemical resistance

• Technical support for production trials, scale-up, and ongoing process optimization of industrial RO membrane elements

Contact SINOHESIVE to request a two-component polyurethane adhesive sample and technical recommendations for industrial RO membrane winding applications.