Calculating Weight Of Plastic Parts

posted by Charles Graves on 13 September 2007 at 4:38 pm

I am trying to find the proper way to convert mass property information taken from 3d CAD models of plastic parts and generate the wieght of the part. I can easily get the mass of the model (in grams) and the volume of the model in cubic millimeters. I am looking for formula(s) to take this info and convert it into the part weight in grams. I do have available to me the specific gravity of various types of plastic material and I believe that this will have to be a part of that formula.

Follow-Up Messages


posted by Rick on 25 September 2008 at 9:38 pm

first, your 3d cad program should let you set the property values and automatically calculate the part weight.

If not, here is the formula I use:

volume in cc3 / 16.287 (constant) X specific gravity of material (constant) X .0361 (constant) X 454 (constant to convert to grams)

This will give you weight in grams.


posted by G.J.AVHAD on 26 November 2008 at 3:56 pm

Plz give us with example.

Convert Volume To Weight

posted by Harper Zarker on 30 December 2008 at 9:13 pm

I have a question on the formulation for converting 5.44 in^3 to oz

Calculation Formula For Plastic

posted by Prabhakar Aswar on 22 September 2009 at 12:36 am

How to calculate the weight of plastic parts theoritically from drawing of parts.

Alternate Material In Mold Design

posted by Prabhakar Aswar on 09 October 2009 at 3:37 am

Can we use Mold Steel D3 instead of hot Die Steel for Al Die Casting Mold Inserts in Mold Design? What will be Total Cost Impact! Decrease or Increase.
Plz Address.

PP To HDPE Conversion

posted by Adil Saleem on 19 April 2010 at 5:10 am

Can any body tell me that if i made 1 plastis product in material PP injection and then the same product in HDPE injection so what will be the weight Difference

Therotical Weight Of Plastic Compo.

posted by ganesh wagh on 15 June 2010 at 12:45 am

How to calculate the weight of plastic parts theoritically from drawing of parts.of various plastic material like pp,minlon,abs.etc

Calculate Plastic Part Weight

posted by David Hodge on 15 November 2010 at 2:22 pm

cu. in. x specific gravity x .0361= wt. in lbs. x 454=grams / 28.35= oz.

I Want A Simple Weight Calculator

posted by avinash on 28 November 2010 at 3:13 am

ples tell me how to calculate a weight of plastic part & i have sample of plastic part & their drwings so how to calculate a weight of these part

Alloable Wastage

posted by donya on 09 April 2011 at 1:37 am

i would like to find the relation between the allowable wastage of injected plastic fragments and the fragments dimensions , fragment weights and fragments shape.
for example a smaller fragment is less possible to brake when transferring than a big one.
although a fragment which has a complex shape is more possible to brake than a simple shaped fragment when transferring.
I thought there might be a formula or a table which can tell me the universal standards for this .
thank you very much

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