CLGS Seals and Sealants – Quiz
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Question 1 of 9
1. Question
List the selection factors when selecting a seal:
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
The material’s compressibility or hardness (durometer)
The performance against environmental and operational conditions, including:
- Oils
- Solvents
- Acids
- Bases
- Steam
- Fuels
- Corrosive chemicals
- The abrasion performance of the material
- The permeability of the material (permeation)
- The cost of the material
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Question 2 of 9
2. Question
What are some characteristics of Nitrile seals?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Temperature range: The nitrile O-ring temperature range is between -65 degrees Fahrenheit and 300 degrees Fahrenheit.
- Suited for: General purpose seals, such as petroleum oils, water, and some hydraulic fluids. Buna-N is also resistant to tears and abrasive treatment.
- Avoid: Buna-N can have problems with automotive brake fluid, ketones, phosphate ester hydraulic fluids, and nitro and halogenated hydrocarbons. While it is ozone and weather-resistant, this resistance is not infallible but can be supported through compounding.
- Applications: Nitrile functions well in applications that have limited temperature and resistance requirements.
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Question 3 of 9
3. Question
What are some characteristics of EPR?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Temperature range: Between -65 degrees Fahrenheit and 300 degrees Fahrenheit.
- Suited for: Skydrol, a hydraulic fluid, has a noxious smell and can irritate the skin, and its corrosive properties can be damaging to equipment. EPR works well with Skydrol and other hydraulic fluids, as well as steam, water, silicone oils, brake fluids, and alcohol.
- Avoid: Similar to nitrile, EPR is not perfect for a wide range of applications due to wear and tear issues.
- Applications: The aerospace industry uses EPR in hydraulic pumps.
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Question 4 of 9
4. Question
What are some characteristics of Fluorocarbon (Viton)?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Suited for: Fluorocarbon is an all-around material that can handle a number of applications, especially diverse sealing jobs that involve movement. It is also suited for petroleum oils, silicone fluids and gases, acids, and some halogenated hydrocarbons, like carbon tetrachloride.
- Avoid: Fluorocarbon is not recommended for Skydrol, amines, esters, and ethers with low molecular weight and hot hydrofluoric acids.
- Applications: Fluorocarbons are very versatile, and features in many different automotive, appliance, and chemical processing industries.
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Question 5 of 9
5. Question
What are some characteristics of Neoprene?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Temperature range: The neoprene O-ring temperature range is between -65 degrees Fahrenheit and 300 degrees Fahrenheit. Types of O-ring seals.
- Suited for: Neoprene can seal refrigerants in refrigeration and air conditioner units, as well as petroleum oils and mild acid resistance silicate ester lubricants.
- Avoid: Finished neoprene products are often compounded with lead-based agents, which can be hazardous to human health. Additionally, some people are allergic to basic neoprene. In a functional sense, it is not very resistant to petroleum lubricants and oxygen.
- Applications: Neoprene functions well in refrigeration units of air conditioning systems.
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Question 6 of 9
6. Question
What are some characteristics of Polyurethanes?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Temperature range: Between -65 degrees Fahrenheit and 212 degrees Fahrenheit.
- Suited for: Polyurethane features abrasion and extrusion resistance, as well as general toughness.
- Avoid: Applications requiring good compression and heat resistance would not be suitable for polyurethane.
- Applications: Polyurethanes are often used for hydraulic fittings, cylinders and valves, pneumatic tools, and firearms.
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Question 7 of 9
7. Question
What are some characteristics of Silicones?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Temperature range: Between -120 degrees Fahrenheit and 450 degrees Fahrenheit, although silicone shave been shown to withstand -175 degrees Fahrenheit during short periods of exposure.
- Avoid: Silicone exhibits poor tear resistance, abrasion, and tensile strength. The poor abrasion resistance means they are better suited for static applications than dynamic. They do perform well with water, steam or petroleum fluids, either.
- Applications: High-temperature fuel injection ports can use silicone.
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Question 8 of 9
8. Question
What are some characteristics of PTFE (Tefon)?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Temperature range: Between -100 degrees Fahrenheit and 500 degrees Fahrenheit.
- Suited for: Pure PTFE is very rigid and hard to apply, but PTFE encapsulated gaskets handle surface wear well, in addition to exhibiting corrosion and abrasion resistance, non-permeability, chemical inertness, and low absorption.
- Avoid: Like silicone, PTFE is rigid and is better suited to static applications.
- Applications: Examples of PTFE uses include automotive steering devices and paint guns.
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Question 9 of 9
9. Question
What are some characteristics of Ethylene Propylene (EPDM)?
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This response will be awarded full points automatically, but it will be reviewed and possibly adjusted after submission.
Grading can be reviewed and adjusted.Grading can be reviewed and adjusted.Hint
- Temperature range: Between -65 degrees Fahrenheit to 300 degrees Fahrenheit.
- Suited for: Applications with exposure to sunlight, ozone, weathering, hot water, stream, automotive and aircraft brake fluids, some acids and bases, ketones, alcohols, plumbing applications.
- Avoid: EPDM is not suitable for use with petroleum oils, fuels.
- Applications: Life Science Industry, Pharmaceutical & Medical applications, Food & Beverage manufacturing, Drinking water applications.
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