{"id":4205,"date":"2024-08-29T06:24:46","date_gmt":"2024-08-29T06:24:46","guid":{"rendered":"https:\/\/incurelab.com\/wp\/?p=4205"},"modified":"2026-08-27T12:56:44","modified_gmt":"2026-08-27T12:56:44","slug":"incure-uni-weld-1013-polyetherimide-bonding-adhesive","status":"publish","type":"post","link":"https:\/\/incurelab.com\/wp\/incure-uni-weld-1013-polyetherimide-bonding-adhesive","title":{"rendered":"Incure Uni-Weld\u2122 1013: Polyetherimide Bonding Adhesive"},"content":{"rendered":"

Polyetherimide, sold most widely as ULTEM, is chosen for parts that have to stay dimensionally stable at temperature, resist hydrolysis, and carry load. Bonding it reliably is harder than bonding commodity plastics, because PEI’s smooth, chemically resistant surface gives an adhesive little to grip. Incure Uni-Weld\u2122 1013, a low-viscosity light-cure acrylate, is a practical answer for PEI assemblies that need fast, clear, structural joints.<\/p>\n

Why PEI Is Difficult to Bond<\/h3>\n

PEI is an amorphous, high-glass-transition thermoplastic with a moderately low surface energy and excellent solvent resistance. Those same properties that make it a good engineering material also make it hard to wet and hard to chemically couple to. An adhesive placed on untreated PEI often forms a bond that looks fine but peels at the interface under modest stress.<\/p>\n

Successful PEI bonding depends on doing three things well: cleaning, treating, and curing fully.<\/p>\n

Surface Preparation for PEI<\/h3>\n
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  1. Clean.<\/strong> Wipe with isopropyl alcohol to remove mold release, plasticizer bloom, and handling oils. Let it flash off completely.<\/li>\n
  2. Treat.<\/strong> Raise surface energy with plasma, corona, or flame treatment. Plasma is the most controllable and typically lifts PEI well above the threshold needed for a durable acrylate bond. Treated surfaces lose activation over hours to days, so bond soon after treatment.<\/li>\n
  3. Verify.<\/strong> Check dyne level or water-break behavior on a sample before committing a production lot.<\/li>\n<\/ol>\n

    Light abrasion followed by a solvent wipe is a lower-cost fallback that improves mechanical keying, though it is less consistent than plasma for structural work.<\/p>\n

    How Uni-Weld\u2122 1013 Performs<\/h3>\n

    At roughly 550\u20131,100 cP, 1013 flows into fitted PEI joints and can be wicked into telescoping or lap geometries after assembly. Cured tensile strength on plastics reaches about 7,100 psi, and elongation near 50 percent lets the joint absorb vibration and small thermal movements rather than fracturing. It cures in seconds under UV, visible, or LED light and offers high optical clarity, which matters when PEI is used in sensor windows or lighting components.<\/p>\n

    Because PEI parts often run warm in service, the bonded joint should be qualified at the real maximum temperature. Differential expansion between PEI and any bonded metal component is a common long-term failure driver; the mechanism is explained in how CTE mismatch causes adhesive bond failure<\/a>.<\/p>\n

    Cure Process for PEI Assemblies<\/h3>\n