Cyanoacrylate FAQs

Durometer Hardness

Durometer hardness is a property presented on technical data sheets that shows how hard the resin is in the cured state.

A durometer gauge is the actual measuring device consisting of a small drill or blunt indentor point under pressure. Different measurement scales are used for different materials depending on how soft or hard the material.

The following chart compares three (3) different graduated measurement scales and relates hardness values to some common objects.

Shore AShore DRockwell MReference Object
30Art Gum Eraser
40Pink Pearl Eraser
5015Rubber Stamp
60Pencil Eraser
7030Rubber Heel
80Rubber Sole
9045Typewriter Roller
10055Pipe Stem
740Textbook Cover
7832Douglas Fir Plywood
8695Hardwood Desktop
90125Glass or Formica

The higher the number within each scale, the harder the material. Shore readings are typically used for plastics. Shore A is for softer materials; Shore D is for harder materials. Rockwell readings are typically used for metals.

(Click to enlarge)
Durometer Hardness

Mathematical Conversions

The following are some common conversions that might be helpful when utilizing Toagosei products:

  • 1 milliliter (ml) = 1 cubic centimeter (cc)
  • 1,000 ml = 1 liter
  • 29.5 ml = 1 fl. oz.
  • 3.78 liters = 1 gallon
  • 473 ml = 1 pint
  • 454 grams = 1 lb.
  • 500 grams = 1.1 lb.
  • 947 ml = 1 quart
  • 1 kilogram = 2.2 lbs.
  • Weight to Volume: grams ÷ specific gravity = cc (ml)
  • Volume to Weight: cc (ml) x specific gravity = grams
  • Density = specific gravity x 0.99823
  • Centipoises = centistokes x density (at a given temp.)
  • Temperature: Degrees F – 32 x 0.556 = degrees C
  • Temperature: Degrees C x 1.8 + 32 = degrees F
  • Square Inches to Square Feet: ÷ by 144
  • Square Feet to Square Inches: x by 144
  • In./lbs. ÷ 12 = ft./lbs.
  • Ft./lbs. x 12 = in./lbs.
  • 16 in. oz. = 1 in. lb.
  • 192 in. oz. = 1 ft. lb.

Area Coverage

Flat Parts:
Length x Width x Bondline Thickness x 16.4 = cc/ml requirement per part

Non-threaded Cylindrical Parts:
Diameter x Engagement Length x Bondline Thickness (on radius / per side) x 3.14 x 16.4 = cc/ml requirement per part

For no induced gap, make the bondline thickness figure 0.001″; 16.4 is a constant for converting cubic inches to cubic centimeters.

Shelf Life

What is the Toagosei shelf life policy for Aron Alpha branded products?

UNOPENED cyanoacrylate products must be stored under refrigerated conditions at 2°C (36°F) to 8°C (46°F). Storage below 2°C (36°F) or greater than 8°C (46°F) can adversely affect product properties.

Unopened cyanoacrylate products should be brought to ambient temperature before the package is opened. Once opened, it should be left at ambient temperature. Products requiring storage at conditions other than those specified here are labeled accordingly.

Material removed from containers may be contaminated during use. Do not return product to original containers. Toagosei cannot assume responsibility for product that has been contaminated or stored under conditions other than as recommended.

Contact Customer Service 614-718-3855 or 1-800-338-5192 if you need additional information.


Viscosity is a product property associated with all Aron Alpha adhesives and Arontite sealants. Viscosity is defined as a measure of the resistance of a fluid to flow (usually through a specific orifice). A measure of this fluid “thickness” is expressed in centipoise values. The higher the number, the thicker the product. Thicker products are less flowable and, in most cases, will fill a larger gap if necessary.

The following chart relates viscosity to some products we are all familiar with:

Common ItemApproximate Viscosity in Centipoise (cps)Cyanoacrylates
Water1 to 5201, 221
Corn Oil50 to 100241F, 202
Maple Syrup150 to 200
Castor Oil250 to 500232, 252F
Motor Oil SAE 601,000 to 2,000203, 203TX
Honey2,000 to 3,000
Molasses5,000 to 10,000253TX
Chocolate Syrup10,000 to 25,000
Ketchup50,000 to 70,000
Peanut Butter150,000 to 250,000Gel 10
Shortening1,000,000 to 2,000,000
Caulking Compound5,000,000 to 10,000,000
Putty100,000,000 +