Molded Dimensions is Essential Business: Open and Shipping Product.

The Coronavirus situation continues to change daily. Here are the updates from Molded Dimensions.

1) Employees: We are initiating work from home for positions where this is possible. Our manufacturing employees, and other essential staff, in Wisconsin continue to report for work and production continues as normal. In addition to regular workplace sanitizing, we continue to provide ways to social distance ourselves and reduce cross-contamination between departments and facilities.

2) Raw Material Supply: We continue to monitor our supply base to assure our raw material stock is available to provide uninterrupted supply for our customers.

3) Production Commitment: Our manufacturing employees are considered "Essential Critical Infrastructure Workers." We do not plan to shut down manufacturing and shipping unless required to do so by governmental restrictions.

Best regards,
Patrick Roddy
VP Sales

Impact Resistance

The impact or shock resistance of an elastomer is determined by striking a sample with a swinging pendulum (hammer). The sample is placed at the lowest point of the arc traveled by the pendulum head. Measuring the difference in the distance of the upswing of the pendulum after the impact, compared to the same upswing with nothing in its path, determines the energy in breaking the sample which is the measure of impact strength.

In the Izod impact method, (ASTM D-256) the test piece is gripped upright and struck with the pendulum 7/8" above the edge of the gripping point. The sample has a standardized notch at the edge of the vise on the side toward the hammer. The Izod Impact Tester and Izod Bar are shown in Figures 1, 2, and 3.

Figure 1

Izod Test Pendulum

Figure 2

Izod Test Pendulum In Motion

Figure 3

Izod Test Specimen In Holder

Most vulcanizates of urethane rubber flex and bend in this type of test. 75D urethane is a material which approaches structural plastics in hardness. Yet even at this hardness, urethane has significantly better impact resistance than plastics. Values for this 75D material are compared in Table I with those of several plastics. In order to approach these high values for 75D urethane, plastic materials require reinforcement with glass fibers.

TABLE I
Impact Resistance, ISOD, Ft Lb/In (ASTM D256)

Hardness, Rockwell or durometer	Nylon Rockwell R108	Acetal Rockwell R120	Acrylic Rockwell M103	Urethane Durometer 75D (Rockwell R90)
Notched, 75F	2.0	1.4	0.3	15.0
Notched, -40F	0.5	1.2	0.3	1.1

A PEEK AT OUR PARTS

Pentathane Applications - Wipers Wiper used to material handling in food processing equipment. This material is both FDA approvable and abrasion resistant for durability.

Pentathane Applications - Wheels Pentathane® chemically bonded directly onto precision sealed bearing molded to tight concentricity specifications.

Elastomer Applications - Hose Hose configured for limited space in marine engine application.

Elastomer Applications - Tube Oil resistant molded tube used on combustion engine.

Impact Resistance

Impact Resistance

A PEEK AT OUR PARTS

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