Specific Gravity (Density) of TPE

TPE (Thermoplastic Elastomer) is a class of polymer materials combining rubber elasticity and thermoplastic processability, with flexible formulation systems. 

Its density varies widely with substrate type, hardness and filling modification, and obvious differences exist among different grades and modified types, as detailed below:

General-Purpose Styrenic TPE (SBS / SEBS substrate, hardness 0A–90A): 0.88～1.10 g/cm³, typical value 0.92 g/cm³, low density for soft low-hardness grades, density close to the substrate itself when unfilled

Medium Hardness General-Purpose TPE (90A–60D): 1.05～1.25 g/cm³, typical value 1.15 g/cm³, density gradually rises with the increase of hard segment proportion or filler content

Filled TPE (Calcium Carbonate / Talc Filled): 1.20～1.50 g/cm³, the higher the filler content, the higher the density, mostly used to reduce cost and adjust processability

Flame Retardant TPE: 1.15～1.35 g/cm³, typical value 1.22 g/cm³, flame retardant addition makes density higher than general-purpose TPE of the same hardness

Wear / Aging Resistant Modified TPE: 1.08～1.28 g/cm³, typical value 1.18 g/cm³, functional additives have little impact on density, with controllable overall fluctuation

Food / Medical Grade TPE: 0.90～1.15 g/cm³, typical value 1.00 g/cm³, no harmful fillers, density closer to pure substrate level

This density parameter is a core basis for the design of daily necessities grips, cable sheaths, automotive seals, smart wearable accessories and food contact products. The adjustability of density makes it suitable for different hand feel, weight and cost requirements. Density calculation is also key data for injection / extrusion mold design, product weight control and assembly fit accuracy control, while supporting its core properties of high elasticity, soft touch and easy processability.