RUBBER KNOWLEDGE CENTER

We are known for our engineering expertise and technical fluency regarding product and process design. We believe sharing this information helps expedite delivering optimum products to market. This knowledge center is based upon our own experience and rubber molding industry (such as ARPM) standards.

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Rubber Knowledge Center

Abrasion Resistance

There are two types of abrasion: sliding and impingement. Sliding is the passing of an adjacent surface across the elastomer…

Adhesion of Elastomers

In the rubber and urethane industry, it is common to adhere an elastomer to a rigid component. Some examples include…

Chemical and Environmental Resistance Properties

These charts compare the physical, chemical resistance, and environmental resistance properties of elastomers.

Comparative Physical, Mechanical and Thermal Properties

This chart compares the physical, mechanical, and thermal properties of elastomers.

Compression and Shape Factor

When a load is applied to an elastomer, it "flows" in accordance with the force exerted on it, and also…

Compression Set

Compression set tests, described in ASTM D-395, are of two main types: Method A, compression set under constant load; and…

Concentricity Versus Runout

Concentricity is the relationship of two or more cylindrical features that have a common center. The center of one feature…

Cost Comparison

The following cost comparison shows the ratio of prices for selected materials to the lowest cost elastomers: EPDM, SBR, and…

Creep and Stress Relaxation

When subjected to load, all elastomers exhibit an increasing deformation with time, known as creep. This occurs at any stress…

Dimensional Tolerancing

Molded thermoset elastomers do not lend themselves to levels of tolerancing seen in machined metals or even in molded thermoplastics.…

Durometer / Hardness

Hardness, as applied to elastomers, is defined as the relative resistance of a surface to indention by an indenter of…

Flash Extension

In the thermoplastic injection molding process, a common part specification is “no flash allowed.” With plastic, however, mold cavity vents…

Material Selection Process

At Molded Dimensions Group, we know it's not always easy to pick an elastomer—there are many factors to take into…

Polymer Types & Characteristics

NATURAL RUBBER (NR) Natural Polyisoprene Advantages: Outstanding resilience; high tensile strength; superior resistance to tear and abrasion; excellent rebound elasticity;…

Resilience / Rebound

Resilience is defined as the ratio of energy given up in recovery from deformation to the energy required to produce…

Rubber Formed Hoses

From large vehicles to aquatic entertainment, rubber hoses are significant contributors to vibration absorption. Formed hoses are used in industries…

Shelf Life Comparison

The shelf life of molded parts assumes storage in controlled environmental conditions, both in terms of temperature and humidity. The…

Static and Dynamic Load Deflection

Rubber and urethane provide greater deflection for applied forces than do rigid materials such as metals or ceramics. Most uses…

Surface Finish and Appearance

When considering the finish and appearance of molded products, several factors are important to take into account. Machined Finish of…

Temperature Capabilities

Rubber and urethane temperature capabilities / Temperature capabilities of basic elastomers

Tensile

Tensile strength and ultimate elongation, while extremely useful for compound development and control, are of lesser importance to the design…