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Advanced EMC Technologies Blog

EMC Engineer Ed

EMC Engineer Ed is the team effort of Dr. Sara McCaslin Mechanical Engineering and Regina Dick in Web Marketing Strategy for Advanced EMC Technologies.

Recent Posts

5 Reasons Why PTFE Seals are an Excellent Choice for Automotive Applications

Posted On May 27, 2016


Automotive PTFE Shaft Seals

In this article, we are going to explore the reasons why PTFE seals are among the best choices for many automotive applications.  You’ll find PTFE seals in fuel cell seals, fuel injection pumps, steering wheel seals, air conditioning, compressor seals, hydraulic seals, and more.  We’re going to focus our attention on PTFE shaft seals.  Let’s take a look!

 

Want more great articles on PTFE Shaft Seals, check it out from the Engineer's choice Advanced EMC Technologies Blog:

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Posted in: Polytetrafluoroethylene PTFE, PTFE Seals, PTFE Rotary Shaft Seals, PTFE

Why Nylon Bushings are a Good Choice for the Bicycle Industry

Posted On May 13, 2016


Reinforced Nylon Bushing Option

Plain bearings in bicycle applications get subjected to a good amount of abuse, from high shock loads as the rider makes their way over uneven terrain, to potentially high speeds as some bikes can reach speeds in excess of 70 mph.  Then there are the issues of environmental contaminants, namely water, mud, sand, and other debris.  That means that cleaning is required, often in the form of steam.  It takes a special type of bushing to stand up under these types of rigors.  One of the options to consider is reinforced nylon.

 

For even more articles for advanced polymer bushings for the bicycle industry check out these posts from the Engineer's choice Advanced EMC Technologies Blog:

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Posted in: advanced polymers, nylon bushings, Bike Bearings and Bushings, Bicycle Industry

Polymer Rear Hub Bushings: Wear Resistant Self-Lubricating Bushings for the Bicycle Industry

Posted On May 06, 2016


INTRODUCTION:

There are a variety of places where you can find composite bushings in a bicycle, including the headset, pedals, brake lever, front and back derailleurs, and the rear suspension, just to name a few.  In this article, we are going to look at the bushings used in rear hubs.

Many people wrongly assume that a polymer rear hub bushing, instead of a metal one, is a cheap substitution made by hub manufacturers.  Nothing could be further from the truth!  Let’s talk about how to select a proper material for a rear hub polymer bushing that will far outshine its metallic counterparts.

Here are some other great articles on polymer bushiings from the Advanced EMC Technologies Blog:

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Posted in: Polymer Bushings, plastic bushings, Bike Bearings and Bushings, Bicycle Industry

3 Reasons You Should Consider PEEK for High Pressure Polymer Seals

Posted On April 15, 2016


Polyetheretherketone PEEK

There are many applications that require high-pressure seals, such as down-hole safety valves, water jet intensifiers, and oil and gas valvesPEEK, short for polyetheretherketone, is a high performance engineering polymer that’s a common choice for high pressure seals.  Let’s see why …

 

 

Want to stay ahead of the curve? Check out additional articles on high performan PEEK seals from the Advanced EMC Technologies blog:

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Posted in: Polyetheretherketone PEEK, Polymer Seals, advanced polymers, PEEK

Cheat Sheet on Surface Finishes and PTFE Spring-Energized Seals

Posted On April 01, 2016


PTFE Spring-Energized Seal Design

When designing a component that includes a spring-energized PTFE seal, it’s not enough just to specify all the seal parameters; another key part of the design is the surface finish of the mating surface.  In this article, we are going to review what surface finish is, discuss the effects of surface finish on seal life, and then go over recommended surface finishes for spring-energized PTFE seals.

 

For more articles on PTFE Spring-Energized Seals from the Advanced EMC Technologies Blog:

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Posted in: Polymer Seals, PTFE Seals, polymer solutions, Spring-Energized Seals, PTFE, PTFE Spring-Energized Seals

Engineer's Choice for Low-cost High-volume Polymer Bushings?

Posted On March 18, 2016

High-Volume Low-Cost Plastic Bushings

In this article, we are going to discuss what the best choices are for high-volume low-cost plastic bushings.  When an engineer is designing a part to be manufactured, there are two approaches: 

  1. the first is to choose an appropriate material, then select a manufacturing process compatible with the material;
  2. the second is to select a manufacturing process, then choose an appropriate material from the ones that are compatible with that process. 
Let’s try answering the question for today’s article by starting with manufacturing processes for plastics. 

 

Want more information on Polymer Bushings? Check out the following post from the popular Engineer's choice Advanced EMC Technologies Blog:

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Posted in: Polymer Bushings, advanced polymers, plastic bushings, nylon bushings, NYLON

Review of PV for Plain Polymer Bearings

Posted On March 11, 2016


In this article, we are going to review some of the basic principles behind the PV value, and take a look at some PV values for commonly used bearing materials.

Introduction

The amount of wear a bearing is going to experience is related to the bearing pressure and the running velocity.  The more pressure applied to the bearing, the faster it will wear; similarly, the faster the bearing surface speed, the more wear will occur.  Did you ever wonder why?  One clue lies in the amount of heat that is generated as a result of interaction between the bearing and the shaft.  The more heat that is generated, the faster the bearing will wear.  One value that represents this relationship between heat generated and the resulting wear is the PV value.  You will see this value used as a key part of the material selection process when specifying a bearing.

Here are some other articles on Polymer Bushings and Bearings from Advanced EMC Technologies Blog:

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Posted in: Polymer Bearings

Four Most Popular Rotary Shaft Seals Material Options and How They Compare

Posted On March 05, 2016


Evolution of Seal Materials

The evolution of seal materials evolved as seals faced more rugged demands.  Early needs could be met using packed hemp or leather, but as the demands became more and more rigorous new materials were sought.  This led to the introduction of natural rubber seals, which evolved into synthetic elastomers, and finally engineering polymers like PTFE (Polytetrafluoroethylene).

Four of the most common modern material options for rotary shaft seal lips are nitrile rubber, polyacrylate, FKM, and PTFE.  Of these materials, three are elastomers – nitrile rubber, polyacrylate rubber and FKM – and only one is polymer – PTFE.  Let’s see how these materials stack up.

 

Want more about PTFE? Check out these artiicles from the popular Advanced EMC Technologies blog:

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Posted in: Polymer Seals, Sealing Solutions, PTFE Rotary Shaft Seals, PTFE

Bushings:  Nylon 6, Nylon 66, and Self-lubricating Nylon

Posted On February 12, 2016


Nylon Bushing Differences:

 Ever wonder what the difference is between Nylon 6 and Nylon 66?  What about Nylon MDS?  In this article, we are going to explore the difference between the types of nylon commonly used in bushings, and how that affects their potential applications.

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Here are some additional articles on nylon bushings from the Advanced EMC Technologies Blog::

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Posted in: Plane Polymer Bushings, Polymer Bushings, advanced polymers, plastic bushings, bushings, nylon bushings

PTFE Spring-Energized Cryogenic Seals Revisited

Posted On January 29, 2016


Cryogenic Seals

Cryogenic seals must not only handle unbelievable low temperatures, but also perform under high pressure conditions.  If you aren’t familiar with cryogenic seals, a cryogenic seal is a special type polymer seal used with media at temperatures below -238°F and down to -460°F (absolute zero).  Cryogenic seals can be found in a variety of industries, from LNG compressors and loading arms in the petroleum industry to rocket propulsion systems in the aerospace industry.

 

 

Other important articles on Cryogenic Seals from Advanced EMC Technologies:

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Posted in: Dynamic Sealing, Polymer Seals, Cryogenic Seals, PTFE Seals, polymer solutions, mechanical loading arm

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