Overview
Catfish glue is a collagen-based adhesive extracted through controlled hydrolysis of catfish connective tissues. Historically used in Asian and European craftsmanship, it offers unique reversible bonding properties prized in conservation work. The production involves cleaning, demineralization, and thermal processing of fish byproducts, yielding a proteinaceous material that gels when cooled and forms strong bonds upon drying. Modern applications leverage its eco-friendly profile compared to synthetic adhesives, particularly in sectors requiring repairability. Unlike petrochemical glues, catfish glue can be reactivated with heat and moisture, making it indispensable for antique restoration where disassembly may be needed.
Physical and Chemical Properties
The adhesive strength of catfish glue stems from its high collagen content, which forms helical fibrils upon drying. These create mechanical interlocking bonds with porous materials like wood, paper, or leather. Its viscosity ranges from 500-2,000 cP in 10% aqueous solutions (at 60°C), with gelation occurring below 35°C. Chemically, it contains 18 amino acids, predominantly glycine, proline, and hydroxyproline. The absence of formaldehyde or volatile organic compounds (VOCs) makes it preferable for indoor use. However, it exhibits lower moisture resistance than synthetic alternatives, limiting outdoor applications unless sealed.
Main Applications
In luxury furniture manufacturing, catfish glue allows for 'cold creep' adjustments during veneer work, preventing warping. Luthiers value its acoustic neutrality in instrument repairs, especially for violin soundpost setting. Japanese shoji screen makers use it for its transparent dried film and shrinkage consistency (~8% by volume). The conservation field employs it for parchment and paper stabilization due to its reversible nature. Recent biomedical research explores its potential as a surgical adhesive, capitalizing on collagen's biocompatibility. Industrial uses include specialty packaging for delicate items where non-permanent bonding is required.
Safety and Storage
While generally safe, catfish glue requires precautions against microbial growth. Additives like thymol (0.1%) are sometimes blended to extend shelf life. Liquid preparations should be refrigerated and used within 2 weeks, while dry forms last 2+ years when kept below 30% humidity. Cross-contamination risks exist in facilities processing other fish products. Allergen labeling compliance is essential for B2B sales. Spills should be cleaned with warm water before drying to prevent stubborn residues. Unlike hide glues, it doesn't require hazardous preservatives like zinc sulfate.
B2B Procurement Guide
Reputable suppliers provide gelatin strength (Bloom value) specifications, typically 150-250 Bloom grams for premium grades. Bulk buyers should request: 1) SDS documentation, 2) heavy metal testing reports (especially mercury), 3) microbial counts (<10,000 CFU/g). Vietnam and Thailand dominate production, with some artisanal European sources. MOQs usually start at 25kg for powdered form. Consider freight costs - the product's 4:1 yield (dry to hydrated) makes shipping dry forms economical. Sample testing should assess clarity (haze <5 NTU) and gelation time (20-40 minutes at 12% concentration).
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