Seals Eastern, Inc.

Rubber Compound Development

for demanding seal and o-ring applications

Tel: 732-747-9200

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Seals Eastern develops rubber compounds to solve your problems

Dan Hertz Jr., founder of Seals Eastern: 'Rubber is an Engineering Material'.

Seals Eastern has always approached both rubber formulation and the application of rubber in systems by using scientific disciplines. Our motto is simple, "Rubber is an Engineering Material". It is upon this most basic premise that Seals Eastern has been so successful in solving customer's sealing problems for nearly sixty years. We have invested a million dollars in analytical instruments, testing instruments, measuring devices, and a comprehensive technical library. Our technical papers online represents only a small number of the numerous papers and chapters published by Seals Eastern.

Seals Eastern has the resources to help you improve your sealing materials

Seals Eastern's Material Development Center includes state-of-the-art instruments for the analysis of cured rubber, uncured rubber, and rubber compounding ingredients. The laboratory is equipped with instruments for Research and Development as well as Quality Assurance. This facility is charged with the following objectives:

MDR 2000E - Moving Die Rheometer

Moving Dies Rheometer Used to characterize the cure profile for all Seals Eastern compounds. A sample of uncured rubber is placed between the rheometer plates; the plates are then closed, forming a sealed cavity. The plates are maintained at 330° F while one plate oscillates. The stationary plate is equipped with a torque transducer, which records the induced torque as time and curing progress. When proper manufacturing controls are in place, the resulting data creates a rheological "fingerprint" to ensure our mixing process is under statistically proven control. The result is consistently high quality rubber for you.

Fourier Transform Infrared Spectroscopy (FTIR):

Seals Eastern utilizes Fourier transformed infrared spectral data for Quality Control and chemical analysis of Fourier Transformed Infrared Spectroscopy rubber compounds and ingredients. Seals Eastern employs a computer integrated FTIR instrument to perform such analysis. We use the Nicolet® Model 460 bench combined with a Spectra-Tech Thunderdome ATR (Attenuated Total Reflectance) accessory as an extremely powerful tool for analysis of elastomer composition and chemical degradation. FTIR enables us to examine the presence or changes of functional organic groups present within the rubber composition. Using this technology, we can help you determine if you have the correct material in your seals and furthermore help you analyze any field problems you might be having with your seals.

ARES - Advanced Rheometric Expansion System

Seals Eastern utilizes an ARES to characterize and analyze the viscoelastic properties of its materials. The ARES Strain-Controlled Rheometer, by Rheometric Scientific, is an advanced instrument capable of mechanical polymer characterization. Dynamic mechanical rheological testing The instrument is capable of a wide range of testing from steady shear to multi-wave temperature sweeps. The instrument is capable of testing in the temperature range of -150° C to 600° C. Dynamic tests can be performed at frequencies between 10-5 rad/s and 500 rad/s. Flow and stress relaxation phenomena are easily observed using the ARES instrument. To learn more about Dynamic Mechanical Thermal Analysis read Luckenbachs paper (note: you will need Acrobat Reader to down load this paper).

Instron Tensile Testing Machines

Instron tensilometer For standard (and some non-standard) measurements of rubber properties, Seals Eastern, Inc. has two Instron tensile testing machines. The Model 4400R and Model 1122 are equipped to perform tensile and peel tests of virtually any rubber compound. Both machines are computer integrated for precise data collection and generation of stress - strain curves as well as integration of the area under the stress- strain curves. Standard tests include: ASTM D429 Method B Peel Test, ASTM D1414 O-Ring Tests, ASTM D412 Tensile Tests.

Differential Scanning Calorimetry (DSC)

Perkin-Elmer DSC 4000 We possess a Differential Scanning Calorimeter (DSC) to measure the heat flow produced in a rubber sample when it is heated, cooled, or held isothermally at constant temperature. This technique enables us to investigate exothermal events caused by crystallization or endothermal melting processes. The resulting information offers clues regarding thermal stability of a material. When used in seal failure forensic work, the information offers insight regarding thermal experience of the seal and/or characteristic of an absorbed transient material.

Thermogravimetric Analysis (TGA)

Perkin-Elmer TGA 4000 Thermogravimetric Analysis allows us to monitor the mass of a rubber sample as a function of temperature or time as the sample specimen is subjected to a controlled temperature program in a controlled atmosphere. Upon heating a rubber compound, its weight increases or decreases depending upon various molecular constituents in the compound. The data produced by this instument provides additional information regarding thermal experience of the seal and/or characteristic of an absorbed transient material.

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