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At LD Davis, we pride ourselves on being an educational resource for our customers, our prospects and the community. Our blog is a helpful learning tool for those wanting to know more about glue best practices, news in the industry and simple answers to common glue questions. Hear it straight from the experts in every post.

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How Is Animal Glue Made?

Animal glues (also known as hide glue, and protein glue) are made through prolonged boiling of pure bovine or porcine animal hides, connective tissues, and bones. 

making animal glue.jpgThese hides contain two groups of protein: chondrin which provides glue strength (bonding potential) and gluten for gelling strength (tackiness or hardness).

Our ingredients guarantee our hide glue products to be 100% non-toxic, environmentally friendly, biodegradable and 100% recyclable.

Animal Glue Bloom Strength and Viscosity

Bloom or gram strength is the measurement that refers to the elasticity of the glue in its gel form. The higher the bloom or gram number, the greater the elasticity and strength of the glue.

 Viscosity (visc.) is the flow characteristics of the glue in liquid form.  This is typically measured in centipoise (cps.) or millipascal seconds. Here is a list of common household products and their corresponding viscosities:

+ Water 1 cps.
+ Kerosene 10 cps.
+ Corn syrup 75 cps.
+ Maple syrup 175 cps.
+ Caster oil 1,000 cps.
+ Karo syrup 5,000 cps.
+ Honey 10,000 cps.
+ Chocolate syrup 25,000 cps.
+ Mustard 70,000 cps.
+ Sour cream 100,000 cps.
+ Peanut butter 250,000 cps.
 

As the viscosity increases so does the "thickness" of the liquid. This same concept applies to glue. Ideally, 120 viscosity will produce a bloom of 360 and therefore would be considered a 120 visc. / 360 gram glue. 

Sometimes glues of different viscosity and gram strength are blended together to achieve different properties.  This would be accomplished by physically blending two or more glues in the dehydrated form until uniformly distributed in the mixture. Doing this during the manufacturing process allows for consistent viscosity and gram strength parameters when heated and melted prior to usage.

Types of Animal Glue

Bone Glue

+ Produced from bovine or porcine bones. 
+ Typically has a low viscosity and gram strength.  Viscosity less than 60 centipoise, gram strength less than 200.
+ Has a larger particle size than hide glue and sometimes needs to be ground.
+ Usually harder and more brittle than hide glue.
+ Can have a stronger odor compared to hide glue due to the presence of sulfur.

Hide Glue

+ Produced from bovine or porcine hide.
+ Viscosity and gram strength varies making it more versatile when compared to bone glue.
+ Common varieties include:
      85 visc / 250 gram
      120 visc / 360 gram
      120 visc / 500 gram
      200 visc / 500 gram
      200 visc / 600 gram
hideglue07.jpg
Using Animal Glue (Hide Glue)

Animal glue is soluble in water and dissolves best in cold water to form a gel.  It is important to soak in cold water first to replenish the moisture it originally contained.  This presents the proper conditions for continuing with low heat application (140°F) to dissolve the glue thoroughly without damaging its properties. 

This procedure establishes a uniform solution which can be applied to the desired material to be bonded.  Once cooled, an elastic gel is produced perfect for bonding purposes.  This property is thermally reversible with heat.

Product Spotlight: Hide Glue

Topics: animal glue, Glue, Hide Glue, viscosity, bloom strength