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    Resin Injection

    Conject PUF 95 water reactive polyurethane injection foaming resin for active leak sealing by MATEX

    Conject Puf 95

    One Component Polyurethane Injection Foaming Resin

    CONJECT PUF 95 is a single-component, halogen-free, water-reactive polyurethane injection resin engineered for sealing active water leaks and filling internal voids in concrete and masonry. Upon contact with water, it expands up to 50 times its volume to form a dense, semi-flexible foam. Designed with a reactive isocyanate blend, it cures quickly, adheres strongly to concrete and metals, and accommodates structural movement. Its low viscosity ensures thorough penetration into microcracks and narrow voids. CONJECT PUF 95 is ideal for leak sealing in basements, tunnels, and below-grade concrete structures, providing durable, long-term waterproofing in harsh or complex conditions.

    Technical data:
    • Color : Resin: brown liquid , Catalyst: transparent liquid
    • Mix ratio : 3 to 5% catalyst on resin
    • Packaging : 10 lit plastic pail
    • Storage Temperature : 10°C to 30°C
    Related Documents:

    How to Apply Conject Puf 95

    Conject PUF 95 is mixed with its catalyst and pumped through fixed packers, where it reacts with water to form a closed cell foam seal.

    1. Drill and fix injectors. Before adding the catalyst, drill holes on the sides of the cracks sized to the diameter of the injectors. Fix expansion injectors with a non-return valve by rotating them so they lock against the walls of the hole.
    2. Mix resin and catalyst. Shake the catalyst well, then mix it with the resin at 3 to 5% by weight, depending on the desired reaction speed. For strong water seepage the catalyst can be increased to 10% for a fast-setting rate.
    3. Inject. Pump the mixture through the fixed packers into the structure; the mixed resin has a pot life of approximately one hour. On contact with water it reacts to form a waterproofing PU foam, and without water it does not expand but continues to penetrate the cracks.
    4. Clean tools. Clean tools with Armosolvent whenever work stops for more than 15 minutes, and immediately after completing the job before the product dries.

    Summary of the method in the Conject Puf 95 Technical Data Sheet. Always follow the full TDS on site.

    Standards & Test Methods

    StandardTitleReferenced for
    EN 1504-5Products and systems for the protection and repair of concrete structures — Concrete injectionListed in the TDS

    Standards and test methods as referenced in the Conject Puf 95 Technical Data Sheet. Values in the TDS are typical laboratory results under standard conditions.

    Frequently Asked Questions

    How much catalyst is added to Conject PUF 95?

    The catalyst is mixed with the resin at 3 to 5% by weight, depending on the desired reaction speed. For strong water seepage the TDS recommends increasing it to 10% for faster setting.

    How fast does Conject PUF 95 react?

    At 25°C, with 3% catalyst reaction starts at 25 seconds and completes at 1’20”; with 4% it starts at 15 seconds and completes at 85 seconds; with 5% it starts at 10 seconds and completes at 70 seconds.

    What is the pot life of Conject PUF 95 once mixed?

    After mixing the resin and catalyst, the mixture has a pot life of approximately one hour. The product is sensitive to humidity, so use the full set once opened.

    Where is Conject PUF 95 used?

    It is used as a waterstop for active water leaks in basement parking and underground concrete structures, concrete joints, tunnels, wells and hydraulic structures, and cracks in dams, canals and crest gates.

    How is Conject PUF 95 packaged and stored?

    Standard packing is a 10 Ltr plastic drum. Store dry and covered between +10°C and +30°C; shelf life is 6 months if stored properly.

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