Density-Specific Gravity Testing Services


IMR performs specific gravity/density testing by the Archimedes Method, measuring the mass of a unit volume of a polymer materials in a standard lab atmosphere, and again while the material is submerged in water. A substance with a specific gravity of <1 will float in water.

The specific gravity of a composite material is actually the specific gravity of the raw polymeric material used in fabrication.

Because polyethylene and polypropylene have specific gravities in the range 0.90–0.96, they will float, which must be considered if the final products operating environment is exposed to water.

Our mechanical group offers testing including impact testingtensile testing, coefficient of expansion, thermo-mechanical analysis (TMA) and much more. 

To discover more about our gravity testing capabilities, click here to request a quote, or click on the button below.

Accelerated Aging (Heat, Fluids)
Bond Strength
Brookfield Rotational Viscosity
Coefficient of Expansion
Coefficient of Friction
Composite Testing
Compression Set
Compressive Properties (-240ºF to 660ºF)
CPSIA Testing
Dynamic Mechanical Analysis (DMA)
Failure Analysis
Flammability (UL94, FMVSS 302, ISO 3795, SAE J369, ASTM D5132)
Fatigue Testing
Flexural Properties (-240ºF to 660ºF)
Gardner Impact
Glass Transition
Gloss (ASTM D523, D4039)
Hardness Testing (Barcol, Durometer/Shore)
Hazardous Substance Testing 
Heat Deflection by TMA (E2092)
Impact Strength
Izod Impact
Kinematic Viscosity
Lap Shear Testing
Melt Flow Rate/Index
Melting Point
Polymer Testing
SEFA Testing
SEM-EDS for Fillers
Taber Abrasion
Tear Resistance of Films & Sheeting
Tear of Rubbers & Elastomers
Tensile Properties (-240F to 660F)
UV Exposure


Click here for a complete list of accreditations and certifications for all IMR Test Labs locations.