H.B. Fuller 42223/52223

H.B. Fuller 42223/52223 (DOUBLE/BUBBLE® A-85) urethane purple is a medium-hardness, highly flexible, two-component polyurethane system designed for use as an adhesive. It is used in casting and coating applications requiring rapid curing, high flexibility, high resilience, transparency, and resistance to breakdown or yellowing from exposure to UV light. H.B. Fuller 42223/52223 is nearly impervious to water exposure during the curing process, yet bonded substrates should be reasonably water-free before application. It exhibits high resistance to aqueous materials after cure. This product is suitable for sealing and bonding flexible substrates such as flexible conveyor belts, printing press rollers, rubberized fabrics, shoes, ski boots, and other sports equipment. It is also excellent for bonding refrigeration and AC equipment.

Chemical FamilyPolyurethanes (PU)

Product Type2K (2 component) Adhesive, Reactive Adhesive, Structural Adhesive

Application AreaIndustrial Conveyors, Refrigerators, Rollers

Compatible Substrates & SurfacesCeramic, Elastomers & Rubbers, Fibers & Fabrics, Plastics

FeaturesGood Non-Yellowing Properties, Good Peeling Strength, Good UV Resistance, High Flexibility, High Impact Performance, High Resilience, Medium Hardness, Rapid Cure Response, Room Temperature Curing, Water Resistant

Technical Data Sheet

Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Features and Benefits
  • Excellent impact performance
  • High peel strength
  • Clear with high resistance to UV light (yellowing and breakdown)
  • Bonds a wide variety of substrates including metals, ceramics, natural rubber, thermosetting polymers and many engineering thermoplastics

Applications & Uses

General Instructions

To obtain the best cured properties, accurate proportioning and thorough mixing are essential. The production of the desired polyurethane requires accurate measurement of the two components and adequate mixing. In general, hand-mixing small production runs is easily accomplished by weighing the two components. Machine mixing utilizes the volumetric ratio. Most machines are calibrated by weighing the components and adjusting the volume ratio. Larger volume hand mixing is easily controlled by filling pre-measured buckets to the indicated heights. Surface must be clean and dry before application. Remove all chemicals, dirt, wax and oil. Abrading or of the bonded surface is recommended. Pre-cleaning with a mild solvent such as acetone or acetone-containing blends will enhance bonding characteristics over high-flexibility substrates.


Physical Form
Component A
ValueUnitsTest Method / Conditions
Component B
ValueUnitsTest Method / Conditions
Cured Mechanical Properties
ValueUnitsTest Method / Conditions
Hardness50.0ASTM D2240
Overlap Shear Strength (Aluminum, acid etched, at 50% RH, 24h)400.0psiASTM D1002
Water Absorption (at 60°C, 30 days, weight gain, immersion)1.4%
Water Absorption (at 60°C, 24h, weight gain, immersion)1.2%
Water Absorption (at 24 h, weight gain, immersion)1.1%
Water Absorption (30 days, weight gain, immersion)1.2%
Cured Properties
ValueUnitsTest Method / Conditions
Tensile Strength (at 50% RH)905.0psiASTM D638
Elongation at Break (at 50% RH)403.0%ASTM D638
Open Time15.0min
Uncured Properties
ValueUnitsTest Method / Conditions
Handling Time90.0min
Specific Gravity1.0
Gel Time (at 25°C, 200 gram)15.0min
Volume Mix Ratio1900-01-03T05:40:00+00:00
Weight Mix Ratio1900-01-03T05:40:00+00:00
Full Cure24.0h
Operating Temperature66.0°C
Rheological Properties
ValueUnitsTest Method / Conditions
Viscosity (Mixed)4000.0

The cure schedule is dependent upon the temperature. The recommended cure schedule will vary with the desired properties. Various heat-cure profiles may produce suitable results.

Storage & Handling

Shelf Life
18 Months (double/bubble packaging), 6 Months (unopened)
Storage Conditions

These materials should be stored in a dry environment within a temperature range of 16 °C to 27 °C (60 °F to 80 °F). Extremes of temperature beyond this range may result in crystallization or polymerization of the materials. Introduction of a nitrogen blanket into the containers before closing will improve the storage life of the products. When using meter-mixed dispense equipment (MMD) machines, reservoir should be blanketed with nitrogen or dry air to avoid moisture and other contamination. Avoid contamination with oxidized metals (such as copper, brass, or mild steel), and rust or other metal oxides. The stability of the product is greatly reduced by materials such as strong acids or bases, sulfur compounds, amines, or reducing agents of any type.