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Teflon vs PTFE, wonder no more, because they are, in fact, one and the same thing, different only in name and nothing else.

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Teflon Vs PTFE... What Really Are The Differences?
so far, you’ll already know what we’re going to say here. There is no winner, no better product and no reason to compare the two substances any further. In conclusion, if you’re wondering about <span>Teflon vs PTFE, wonder no more, because they are, in fact, one and the same thing, different only in name and nothing else. Back to latest news > Contact Us Northern Engineering (Sheffield) Ltd, Haigh Moor Drive, Brooklands Park, Sheffield S25 2JY Tel: +44 (0) 1909 560 203 | Fax: +44 (0) 1909 560 184 Emai




Flashcard 4507704626444

Tags
#materials #plastics
Question
Teflon vs PTFE
Answer
they are the same


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Teflon Vs PTFE... What Really Are The Differences?
the trademarked brand name for PTFE owned by Chemours, and just as we call our vacuums Hoovers and sticky tape Sellotape, so we’ve come to know PTFE by the name it was given. Which is better in <span>Teflon vs PTFE? If you’ve been paying attention so far, you’ll already know what we’re going to say here. There is no winner, no better product and no reason to compare the two substances any further.







Flashcard 4507708558604

Tags
#definitions #materials
Question
Hydrophobic:
Answer
resistance to water


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Teflon Vs PTFE... What Really Are The Differences?
in a wide range of applications. For example: Very high melting point: With a melting point of around 327°C, there are very few situations where PTFE would be damaged by heat. Hydrophobic: It’s <span>resistance to water means it never gets wet, making it useful in cooking, wound dressings and more. Chemically inert: The majority of solvents and chemicals will not damage PTFE. Low coefficient of frictio







Very high melting point: With a melting point of around 327°C, there are very few situations where PTFE would be damaged by heat.Hydrophobic : It’s resistance to water means it never gets wet, making it useful in cooking, wound dressings and more. Chemically inert: The majority of solvents and chemicals will not damage PTFE.Low coefficient of friction: The coefficient of friction of PTFE is one of the lowest of any solid in existence, meaning nothing will stick to it.High flexural strength: It’s ability to bend and flex, even at low temperatures, means it can be easily applied to a variety of surfaces without losing its integrity.

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Teflon Vs PTFE... What Really Are The Differences?
wo simple elements; carbon and fluorine. It is derived from tetrafluoroethylene (TFE) and has some unique properties that make it a useful material in a wide range of applications. For example: <span>Very high melting point: With a melting point of around 327°C, there are very few situations where PTFE would be damaged by heat. Hydrophobic: It’s resistance to water means it never gets wet, making it useful in cooking, wound dressings and more. Chemically inert: The majority of solvents and chemicals will not damage PTFE. Low coefficient of friction: The coefficient of friction of PTFE is one of the lowest of any solid in existence, meaning nothing will stick to it. High flexural strength: It’s ability to bend and flex, even at low temperatures, means it can be easily applied to a variety of surfaces without losing its integrity. All these unique properties mean PTFE is a very useful material and is widely used in both domestic and commercial applications. You probably have PTFE in your own home, coating your no




materials
#has-images
Stress Corrosion Cracking (SCC)



Usually, most of the surface remains unattacked, but with fine cracks penetrating into the material. In the microstructure, these cracks can have an intergranular or a transgranular morphology. Macroscopically, SCC fractures have a brittle appearance. SCC is classified as a catastrophic form of corrosion, as the detection of such fine cracks can be very difficult and the damage not easily predicted. Experimental SCC data is notorious for a wide range of scatter. A disastrous failure may occur unexpectedly, with minimal overall material loss.

The micrograph on the right (X500) illustrates intergranular SCC of an Inconel heat exchanger tube with the crack following the grain boundaries.

The micrograph on the left (X300) illustrates SCC in a 316 stainless steel chemical processing piping system.Chloride stress corrosion cracking in austenitic stainless steel is characterized by the multi-branched "lightning bolt" transgranular crack pattern.

The most effective means of preventing SCC are: 1) properly with the right materials; 2) reduce stresses; 3) remove critical environmental species such as hydroxides, chlorides, and oxygen; 4) and avoid stagnant areas and crevices in heat exchangers where chloride and hydroxide might become concentrated. Low alloy steels are less susceptible than high alloy steels, but they are subject to SCC in water containing chloride ions.

Chloride SCC

One of the most important forms of stress corrosion that concerns the nuclear industry is chloride stress corrosion. Chloride stress corrosion is a type of intergranular corrosion and occurs in austenitic stainless steel under tensile stress in the presence of oxygen, chloride ions, and high temperature. It is thought to start with chromium carbide deposits along grain boundaries that leave the metal open to corrosion. This form of corrosion is controlled by maintaining low chloride ion and oxygen content in the environment and use of low carbon steels.

Caustic SCC

the extensive qualification of Inconel for specific applications, a number of corrosion problems have arisen with Inconel tubing. Improved resistance to caustic stress corrosion cracking can be given to Inconel by heat treating it at 620oC to 705oC, depending upon prior solution treating temperature. Other problems that have been observed with Inconel include wastage, tube denting, pitting, and intergranular attack.

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Stress Corrosion Cracking SCC
ology Flow chart Range of Applications QUALIFICATION EQUIPMENT Producing Equipment Testing Equipment QUALITY&SERVICE Quality Control Service METALS ENGINEERING FEEDBACK CONTACT US Corrosion <span>Stress Corrosion Cracking (SCC) Usually, most of the surface remains unattacked, but with fine cracks penetrating into the material. In the microstructure, these cracks can have an intergranular or a transgranular morphology. Macroscopically, SCC fractures have a brittle appearance. SCC is classified as a catastrophic form of corrosion, as the detection of such fine cracks can be very difficult and the damage not easily predicted. Experimental SCC data is notorious for a wide range of scatter. A disastrous failure may occur unexpectedly, with minimal overall material loss. The micrograph on the right (X500) illustrates intergranular SCC of an Inconel heat exchanger tube with the crack following the grain boundaries. The micrograph on the left (X300) illustrates SCC in a 316 stainless steel chemical processing piping system.Chloride stress corrosion cracking in austenitic stainless steel is characterized by the multi-branched "lightning bolt" transgranular crack pattern. The most effective means of preventing SCC are: 1) properly with the right materials; 2) reduce stresses; 3) remove critical environmental species such as hydroxides, chlorides, and oxygen; 4) and avoid stagnant areas and crevices in heat exchangers where chloride and hydroxide might become concentrated. Low alloy steels are less susceptible than high alloy steels, but they are subject to SCC in water containing chloride ions. Chloride SCC One of the most important forms of stress corrosion that concerns the nuclear industry is chloride stress corrosion. Chloride stress corrosion is a type of intergranular corrosion and occurs in austenitic stainless steel under tensile stress in the presence of oxygen, chloride ions, and high temperature. It is thought to start with chromium carbide deposits along grain boundaries that leave the metal open to corrosion. This form of corrosion is controlled by maintaining low chloride ion and oxygen content in the environment and use of low carbon steels. Caustic SCC the extensive qualification of Inconel for specific applications, a number of corrosion problems have arisen with Inconel tubing. Improved resistance to caustic stress corrosion cracking can be given to Inconel by heat treating it at 620oC to 705oC, depending upon prior solution treating temperature. Other problems that have been observed with Inconel include wastage, tube denting, pitting, and intergranular attack. Related References: 1. austenitic stainless steel 2. Stress Corrosion Cracking SCC 3. Chloride Stress Corrosion Cracking (CLSCC) 4. Stress Corrosin Cracking SCC of Duplex Stainless Stee




Flashcard 4507723238668

Tags
#materialProperties #materials
Question
Rm [N/mm2]
Answer
tensile strength


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Tensile strength Rm, definitions of mechanical properties for screws | Bossard Group
elated documents Home Assembly Technology Expert Technical Information and Tools Technical resources Definitions of mechanical properties for screws Tensile strength Rm [N/mm2] Tensile strength <span>Rm [N/mm2] E-Mail Print Determines how much axial load a screw must withstand without breaking. If full size screws are tested, the yield strength can only be approximately established. Under ISO







Flashcard 4507728219404

Tags
#materialStandards #materials
Question
ASTM A48 Standard for
Answer
Gray Iron Castings


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ASTM A48 Standard for Gray Iron Castings
Iron Castings [imagelink] ┆ About Us ┆ Casting Products ┆ Casting Workshop ┆ Machining Workshop ┆ Inspection ┆ Certificate ┆ Blog Articles ┆ Contact Us ┆ ASTM A48 Standard for <span>Gray Iron Castings ASTM A48 / A48M Standard Specification for Gray Iron Castings, grades including Class No. 20, 25, 30, 35, 40, 45, 50, 55, 60. Class No. 20 A, 20 B, 20 C, 20 S, Class No. 25 A, 25 B, 25







Flashcard 4507731102988

Tags
#materialStandards #materials
Question
ASTM A48 Class 20, castings must be
Answer
>= 20 ksi


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ASTM A48 Standard for Gray Iron Castings
dry, because the A, B, C, S are just the requirements to the test bar. For example, ASTM A48 Class 20 will be detailed enough for iron foundries, it means the min. tensile strength of gray iron <span>castings must be higher than 20 ksi (138 Mpa). ASTM A48 Class 20: Min. Tensile Strength 20 ksi (138 Mpa) ASTM A48 Class 25: Min. Tensile Strength 25 ksi (172 Mpa) ASTM A48 Class 30: Min. Tensile Strength 30 ksi (207 Mpa)







gribouillis sur nos calepins

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Selon les scientifiques, les peintures préhistoriques auraient été réalisées pour passer le temps durant des réunions — Le Gorafi.fr Gorafi News Network
fet, un groupe de scientifiques affirment que les fresques préhistoriques auraient été réalisées pour passer le temps durant des réunions très ennuyeuses. Reportage. « C’est l’équivalent de nos <span>gribouillis sur nos calepins d’aujourd’hui » affirme Christelle Bourder qui a analysé plusieurs des peintures préhistoriques. « Il semble que l’invention du dessin soit contemporaine de l’invention du concept même




Flashcard 4507740802316

Question
parois des grottes
Answer
cave walls


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Selon les scientifiques, les peintures préhistoriques auraient été réalisées pour passer le temps durant des réunions — Le Gorafi.fr Gorafi News Network
(concept d’ailleurs qui fut amené en Europe par les Sapiens arrivant d’Afrique) et il fallait bien s’occuper ». Aussi, très rapidement, les hommes préhistoriques commencèrent à dessiner sur les <span>parois des grottes pour passer le temps. À l’époque, pas de feuille de papier ou de stylo à bille. Aussi les hommes se tourneront logiquement vers les parois de leur grotte et des fuseaux de charbon. Les







Flashcard 4507743423756

Question
gribouillis sur nos calepins
Answer
scribbles on our notepads


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Selon les scientifiques, les peintures préhistoriques auraient été réalisées pour passer le temps durant des réunions — Le Gorafi.fr Gorafi News Network
fet, un groupe de scientifiques affirment que les fresques préhistoriques auraient été réalisées pour passer le temps durant des réunions très ennuyeuses. Reportage. « C’est l’équivalent de nos <span>gribouillis sur nos calepins d’aujourd’hui » affirme Christelle Bourder qui a analysé plusieurs des peintures préhistoriques. « Il semble que l’invention du dessin soit contemporaine de l’invention du concept même







Flashcard 4507745783052

Question
the “p ≫ N” problem is learning in *** feature spaces. These problems arise in many areas, including ***.
Answer
the “p ≫ N” problem is learning in high-dimensional feature spaces. These problems arise in many areas, including document classification.


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Flashcard 4507747618060

Question
In supervised learning, the goal is to predict the value of an *** measure based on a number of *** measures
Answer
In supervised learning, the goal is to predict the value of an outcome measure based on a number of input measures


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The challenges in learning from data have led to a revolution in the sta- tistical sciences. Since computation plays such a key role, it is not surprising that much of this new development has been done by researchers in other fields such as compu ter science and engineering.

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