Ultraflex™ 4320 is a solvent-based adhesive that can be used as a one- or two-component system. It has a high heat activation temperature and offers high green strength, which means it provides strong initial bonding even before full curing. It is designed for sole and upper bonding in the footwear industry. Additionally, it is worth noting that Ultraflex™ 4320 exhibits excellent green strength even when used at a lower concentration than the recommended amount.

RTU Product Type: Solventborne Adhesive

Application Area: Footwear, Shoes, Textiles

Compatible Substrates & Surfaces: Leather, Polyurethane, Rubber, Textiles, Thermoplastic Polyurethane Elastomer (TPU)

Application Method: Brush

Chemical Family: Polyurethanes (PU)

Features: Chemical Resistant, Excellent Aging Resistance, Good Bonding Strength, Good Green Strength, Heat Resistance, Solvent-Based

    Enhanced TDS

    Identification & Functionality

    Features & Benefits

    Applications & Uses

    Properties

    Physical Properties
    ValueUnitsTest Method / Conditions
    Solid Content17wt.%Internal HBF Standard
    Density0.86g/cm³DIN EN ISO 2811-1
    Cured Properties
    ValueUnitsTest Method / Conditions
    Pot Life (H.B. Fuller® Hardener 49631, depending on ambient temperature and relative air humidity)7 - 8hours-
    Pot Life (H.B. Fuller® Hardener 9515, depending on ambient temperature and relative air humidity)5 - 6hours-
    Pot Life (H.B. Fuller® Hardener FC/UV, depending on ambient temperature and relative air humidity)5 - 6hours-
    Pot Life (H.B. Fuller® Hardener 49631, depending on ambient temperature and humidity)7 - 8hours-
    Pot Life (H.B. Fuller® Hardener 9515, depending on ambient temperature and humidity)5 - 6hours-
    Pot Life (H.B. Fuller® Hardener FC/UV, depending on ambient temperature and humidity)5 - 6hours-
    Processing Parameters
    ValueUnitsTest Method / Conditions
    Processing Temperature15 - 25°C-
    Viscosity (at 20°C)3000mPa·sBrookfield RVT
    Activation Temperature70 - 80°C-
    Mixing Ratio (With cross-linking agent, By weight)5 - 10%-
    Flash-off Time / Waiting Time (depending on temperature, coating weight and substrate, With cross-linking agent)20 - 90m-
    Flash-off Time / Waiting Time (With cross-linking agent , Depending on temperature, coating weight, and substrate)20 - 90m-
    Viscosity (at 20 °C)3000mPa.sBrookfield RVT

    Packaging & Availability

    Regional Availability
    • Europe
    • India/MiddleEast/Africa (IMEA)