Name: Animal Hide Glue Granules Grade 256B
Brand: Coatingsink
SKU: animal-hide-glue-granules
Availability: InStock

Question 1

How should Grade 256B hide glue granules be prepared for use?

Accepted Answer

Soak granules in cold water (1 part glue : 1.5–2 parts water by weight) for 30–60 minutes until fully swollen, then heat gently in a double boiler or heated glue pot to 55–65°C — never exceed 70°C, as prolonged high heat degrades Bloom strength irreversibly. A 15–20% working solution is typical for woodworking and bookbinding; higher concentrations (up to 25%) give faster grab on porous substrates.

Question 2

What is the significance of 256 Bloom strength compared to lower or higher grades?

Accepted Answer

Bloom strength measures gel rigidity and correlates directly with molecular weight and bond strength. Grade 256B sits in the high-strength range: it delivers a firm, creep-resistant glue line preferred in fine furniture joinery and musical instrument making, while remaining workable at standard double-boiler temperatures. Lower Bloom grades (≤ 135) are used for sizing and paper applications where film flexibility matters more than bond strength.

Question 3

How is the reversibility of hide glue utilized in conservation and repair applications?

Accepted Answer

Hide glue bonds are thermally and hydrolytically reversible — applying moisture and heat (60–70°C) softens the glue line without damaging wood fibres, enabling non-destructive disassembly. This property is essential in antique furniture restoration, luthiery (instrument repair), and archival bookbinding, where future serviceability of the joint is a functional requirement. Epoxy and PVA-based adhesives do not offer comparable reversibility.

Ash Content	≤ 2%
Bloom Strength	256 g (Bloom)
Moisture Content	≤ 14%
pH (10% solution, 60°C)	6.5–7.5
Viscosity (10% solution, 60°C)	35–50 mPa·s

Animal Hide Glue Granules Grade 256B

Specifications

FAQ

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