Determination of Density of Rubber

Density of Rubber

There are three way find Density of Rubber 

  • Pyknometer  (Density bottle)
  • Dimension (mass/volume)
  • Balance Pan straddle 

  1. Pyknometer  ( Density bottle )

Apparatus
Pyknometer

Analytical balance

Reagent


Procedure

  • Cut piece rubber sample
sample in glass
  • Weight at least 2.5 gm

analytical balance with sample

  • weight of density bottle, cut piece sample and water ( Use hot water )
density bottle cut piece sample and water

  • weight of Density bottle and water
Density bottle and water

Calculation


Density of rubber (g/cm³) = M / M3 - M + M1  
                                                      =  2.5234 / 44.7098 - 45.4444 + 2.5234 
                                                = 1.41 g/cm³
where 
        • M1 - Weight of sample 
        • M  Weight of Density bottle,sample and water
        • M-  Weight of  density bottle and water

2. Dimension (mass/volume)

Apparatus
Vernier Scale

  • Analytical Balance
Analytical balance

Procedure

  • Cut sample 
rubber sample
  • weight of sample in gm
sample weight analytical balance


  • measure length in cm
Vernier Scale

  • measure width in cm
Vernier Scale

  • measure thickness in cm
Thickness gauge


Calculation


Density of rubber (g/cm³) = Mass / Volume = Mass / l*b*h
                                                      =  2.9293 / 3.146*1.154*0.573
                                                = 1.41 g/cm³



3. Balance Pan straddle 

Apparatus
  • Analytical Balance
Analytical balance



Reagent

  • Distilled water

Procedure

  • Cut sample 
rubber sample



  • Tare Analytical balance (after setup see pic)
Analytical balance


  • weight of sample in air (gm)
Analytical balance


  • weight of sample in water (gm)

analytical balance

Calculation


Density of rubber (g/cc) = M / M1  - M2  
                                                      =  2.9291 / 2.9291 - 0.8608
                                                = 1.41 g/cc
where 
          • M- Weight of sample in air
          • M- Weight of sample in water


Reference - IS 3400 part- 9 - Method for Determination density  of Rubber materials 









 

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