Properties of Granite

 

Properties of Granite

Most people know that Granite is the most popular choice for Kitchen Countertops, Bathroom Vanity tops and Stone Flooring. What most people don’t know is why granite is so popular for Kitchen and bathroom remodels?

Perhaps this is because Granite comes in a huge variety of colors with variation in veining and consistency? That is a huge benefit to choosing granite, but what makes Granite a great choice for Kitchen countertops (and Bathrooms, laundry rooms and even flooring) is that Granite is The Most Durable Stone in the World!  Granite is fire resistant, scratch/abrasion resistant and even water resistant once sealer is applied.

However, in the past, little was known about the strength values of granite. Today, scientists have tested and documented the full range of granite and all its capabilities. Below is the property range of values for granite. These values determines it’s strength which measures its ability to resist stresses.

Property Range of Values and Strengths of Granite

granite kitchen slab countertop

Compressive Strength (C170) lbs/in² ………………………..4,700-60,000

Recommended (min):19,000

 

Flexural Strength (C880) lbs/in² ………………………..700-5,500

Recommended   (min): 1,200

 

Modulus of Elasticity (C1352)** (in millions) lbs/in² ………………………..2.0-10.0

 

Density (C97), lb/ft3 ………..150-200

Recommended (min): 160

 

Coefficient of Thermal Expansion in/in/ºF………4.7 x 10-6

 

Average Modulus of Rupture (C99) lbs/in² ………………………..1000-3000

Recommended (min): 1,500 Absorption % (by weight) …..0.02-0.40

Recommended (max): 0.40

 

Abrasion Resistance Ha………20-90

Recommended (min): 25

 

Fire- Resistance Property of Granite

Stone is not combustible and is considered a fire-resistant material. Due to its thermal conductivity, heat transfer is fairly rapid.  Most stone is not considered a highly rated thermal insulator. Underwriters’ fire-resistance ratings evaluate whether or not a material will burn, as well as how long it will keep surrounding combustible materials from reaching temperatures that will cause them to ignite.

Abrasion Resistance Property of Granite

The hardness and uniform wearing qualities of most granites make them extremely desirable and economically practical for kitchen countertops.

Granite is also great for floors and stairs.  Varieties with an abrasive hardness of 25 or higher, are recommended for use as flooring that are subjected to normal foot traffic.

Factors Affecting Properties of Granite

The ultimate test of a building material is its ability to have and maintain the necessary structural strength, as well as beauty of appearance and low cost of maintenance, over the useful life of the structure. Experience has proven that granite meets this test as few other building materials can. Studies have shown that the durability of granite is not greatly affected by weather cycles. Additionally, granite does not absorb moisture which makes it weather resistant.

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