SPECIFIC GRAVITY OF TIMBER (IS-1708-Part 2-1986)

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Objective

For determination of specific gravity of timber. 

Reference Standards

IS : 1708 (Part 2)-1986

Equipment & Apparatus

  • Balance(0-10kg)
  • Oven(3000C) 

Preparation of sample

The dimension of sample to be tested is 6 cm in length and 2 x 2 cm in cross-section or 15 cm in length and 5 x 5 cm in cross-section. 

Procedure

  1. The sample is weighed (W1) with accuracy of 0.001g in a weighing balance.
  2. The dimension of the specimen is measured correct to 0.01 cm and volume is calculated by multiplying all the three dimensions (V1). 

Calculation

Specific gravity is calculated as given below.

Timber sp. gravity 1

Timber sp. gravity 2

Where

W1 = Weight in g of test specimen

V1 = Volume in cm3 of test specimen, and

m = % age moisture content of the test specimen

Reports

The Sp.gravity of timber is reported to three significant figures

Safety & Precautions

  • Thoroughly cleaned & dried the container before testing.
  • Special care should be taken that no outer air enters when using the balance.
  • Use hand gloves, apron & safety shoes at the time of testing.

2 thoughts on “SPECIFIC GRAVITY OF TIMBER (IS-1708-Part 2-1986)”

  1. If you check the wood database, the Specific Gravity of different woods varies from about .14 for Balsa to 1.05 for Lignum Vitae. NO timber has a SG of 1.5. Only the lignum component of wood has a SG of 1.5, but that is not the overall SG of timber.

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