H.B. Fuller UR 3543 A-E + UR 3543 BTF-E

H.B. Fuller UR 3543 A-E + UR 3543 BTF-E is a two-component polyurethane adhesive with excellent adhesion to wet and dry reverse osmosis membranes, as well as excellent resistance to acidic and basic solutions. It is typically used as an adhesive for osmosis filter bonding and potting applications.

Product Type: 2K (2 component) Adhesive, Potting Compound, Solvent free (100% Solids) Adhesive

Application Area: Filtration Membranes, Osmosis Filter

Chemical Family: Polyurethanes (PU)

Features: Acid Resistant, Alkali Resistant, Good Adhesion, Good Tensile Properties, High Elongation, High Solids Content, Long Open Time, Long Shelf Life

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Features & Benefits
  • Long open time
  • Excellent resistance to acidic and basic solutions
  • Good tensile and elongation properties
  • Excellent adhesion to wet and dry reverse osmosis membranes

Applications & Uses

Application Area

Adhesive for Osmosis filter bonding and potting.

Suitable Substrates

Reverse osmosis and ultra-filtration membranes.

Application Instructions
  • Two- component polyurethanes cure only in combination with a suitable hardener. Before processing the hardener must be added in the right mixing ratio and stirred homogeneously. After addition of the hardener the mixture can be used for a certain time. This time changes by environment-, and adhesion temperature and by the total quantity of the mixture as well.
  • A negligible change of mixing ratio only affects the mechanical properties but not processing time or minimum curing time. The reaction of two-component polyurethane adhesives strongly depends on temperature. Therefore, the temperature of working process should not fall below +15°C because the curing process can be disturbed, and the properties of the adhesive joint could change. Curing can be accelerated by heat. However, recommend not to increase temperature above +60°C.
  • Pre-treatment of bonding surfaces: Surfaces must be clean, dry and free of grease and oil. Polyolefin materials must be corona pre-treated or flame treated. Other plastics like ABS, PS, PVC, PC etc. as well as most metals should be pre-treated with suitable primers.
  • Processing: Before processing the adhesive must be stirred well and carefully mixed with the hardener. It must be applied thinly to one bonding surface. It must be applied as much adhesive until the joint between the bonding surfaces is completely filled.
  • Applicator: Two- component mixing machines, tooth trowel, Pfohl roller. Because of no initial strength, the bonding until curing must be fixed or pressed until the adhesive is cured. The adhesive must not be diluted.
Cleaning Instructions

Tools can be cleaned by the cleaning agents ISA-Verdünner 1 or ISAVerdünner 12. To clean the supply pipes and mixing head of two-component equipment, ISA-Reiniger 204 can be used. If cleaners from other suppliers are used, tests with these cleaners must be done.


Typical Properties
ValueUnitsTest Method / Conditions
Solid Content100.0%-
Densityapprox. 1,00g/cm³-
Viscosityapprox. 18 000mPa.s-
Mix Ratio (Part A:Part B)1900-01-03T05:55:00+00:00--
Pot Lifeapprox. 45min-
Minimum Curing Timeapprox. 24h-
Processing Temperature15 - 25°C-

Storage & Handling

  • In original sealed packaging protected from sun, dust, moisture and high temperatures.
  • UR 3543 A-E: not sensitive to frost.
  • UR 3543 BTF-E: damaged below +5°C.
  • Store this product in closed container between +5°C and +35°C. Not reusable after warming.