Teflon is an excellent electrical insulator and very resistant to tracking currents. The surface tension is extremely low and therefore it is very difficult to wet, so that it is both water-repellent and grease-repellent. Similar to the MVQ/VMQ silicones, PTFE has a high gas permeability. That is why PTFE and ePTFE are very suitable for use in the food industry.

To meet the most demanding needs, we also offer customised industrial seals made of PTFE and PTFE compounds: get in touch with our sealing experts. We are happy to hold a consultation with you so that you can receive a custom-made Teflon seal.

PTFE is an extremely versatile material for sealing technologies and can be employed in nearly all sealing applications. It is suitable for a wide range of temperatures, from very low to very high, with PTFE flat gaskets operating at temperatures from -200°C (-328°F) to +260°C (500°F), maintaining stability across virtually the entire pH spectrum.

These attributes lead to exceptional properties that find utility in numerous applications. The most well-known uses include non-stick coatings for kitchenware such as pots and Teflon-coated pans, and also GoreTex membranes (thin, breathable PTFE films).

It remains indestructible even when exposed to most of the harshest chemicals and is non-flammable. PTFE is resistant to oxidants and UV radiation and does not age, weather, or corrode.

An individual who does not itemize his deductions and who is not described in section 6012(a)(1)(C)(i), whose gross income is less than $10,000 and includes no income other than remuneration for services performed by him as an employee, dividends or interest, and whose gross income other than wages, as defined in section 3401(a), does not exceed $100, shall at his election not be required to show on the return the tax imposed by section 1. Such election shall be made by using the form prescribed for purposes of this section. In such case the tax shall be computed by the Secretary who shall mail to the taxpayer a notice stating the amount determined as payable.

Teflon also sees widespread use in industry and in seals, particularly when there's a demand for the highest resistance to chemicals or excellent sliding characteristics, making use of comprehensive seal sets. The subsequent sections will discuss further advantages of using polytetrafluoroethylene over other plastics. Learn about our sealing knowledge.

Subsec. (b)(4). Pub. L. 95–30, § 101(d)(14), substituted “itemizes his deductions or has an unused zero bracket amount” for “does not elect the standard deduction or where the taxpayer elects the standard deduction but is subject to the provision of section 141(e) (relating to limitations in case of certain dependent taxpayers)”.

1977—Subsec. (a). Pub. L. 95–30, § 101(d)(13), substituted “An individual who does not itemize his deductions and who does not have an unused zero bracket amount (determined under section 63(e)), whose gross income” for “An individual entitled to take the standard deduction provided by section 141 (other than an individual described in section 141(e)) whose gross income” and struck out “and shall constitute an election to take the standard deduction” after “Such election shall be made by using the form prescribed for purposes of this section”.

Amendment by section 803(d)(1) of Pub. L. 91–172 applicable to taxable years beginning after Dec. 31, 1969, see section 803(f) of Pub. L. 91–172, set out as a note under section 1 of this title.

1986—Subsec. (a). Pub. L. 99–514, § 104(b)(16)(A), substituted “who is not described in section 6012(a)(1)(C)(i)” for “who does not have an unused zero bracket amount (determined under section 63(e))”.

Amendment by section 301(b)(2) of Pub. L. 88–272 applicable to taxable years beginning after Dec. 31, 1963, except for purpose of section 21, see section 301(c) of Pub. L. 88–272, set out as a note under section 3 of this title.

Teflon is a trademark of the American company DuPont for the plastic polytetrafluoroethylene (PTFE). It is a polymer made of fluorine and carbon (fluoroplastic) that was discovered and subsequently developed in the United States during the 1930s and 40s. PTFE is synthesized through the polymerization of tetrafluoroethylene gas.

1969—Subsec. (a). Pub. L. 91–172, § 803(d)(1), raised the individual gross income limit of $5,000 to $10,000 for exercising the option to pay the tax under section 3 of this title, and struck out provisions relating to heads of household, surviving spouses and married individuals filing separate returns.

1964—Subsec. (a). Pub. L. 88–272 struck out “34 or” before “37 shall not be allowed”, and inserted provision that in case of a married individual filing a separate return and electing benefits of this subsection, neither Table V in section 3(a) nor Table V in section 3(b) shall apply.

PTFE seals are always used when good sliding properties, wide temperature ranges and high chemical resistance are required. The low friction makes Teflon the ideal material for various industries when dynamic seals are required (e.g. as a hydraulic seal and pneumatic seal). What exactly are hydraulic seals?

PTFE is extremely thermally stable and retains its mechanical properties in the temperature range from -200°C (-328°F) to high temperatures of +260°C (+500°F). At higher temperatures and in fires, PTFE decomposes into toxic and corrosive gases.

The primary weakness of Teflon lies in its relatively low wear resistance; it cannot match the high durability of materials such as NBR or HPU solid, which demonstrate superior wear resistance. This limitation can be significantly mitigated by incorporating fillers like graphite or bronze into composite materials known as compounds. Moreover, Teflon is prone to creeping under constant stress

Amendment by Pub. L. 95–30 applicable to taxable years beginning after Dec. 31, 1976, see section 106(a) of Pub. L. 95–30, set out as a note under section 1 of this title.

Amendment by section 201(d)(14) of Pub. L. 88–272 applicable with respect to dividends received after Dec. 31, 1964, in taxable years ending after such date, see section 201(e) of Pub. L. 88–272, set out as a note under section 22 of this title.

Corrosive chemicals are processed as standard in the chemical and pharmaceutical industries. Seals made of PTFE are omnipresent here, because ordinary rubber seals and seals made of silicone would be attacked and show inadequate service life. PTFE seals are also often used in fittings and valves, such as turbine construction and hydroelectric power plants.

The bonds between fluorine and carbon in PTFE are chemically extremely stable, and therefore inert. Moreover, the high content of fluorine atoms bestows the material with a surface that is both water and oil-repellent, exhibiting very low friction.

PTFE is also used for mechanically demanding dynamic seals: as a rod seal, scraper or piston seal. Mechanical strength is improved in such cases by fillers, e.g. PTFE compounds such as PTFE bronze, PTFE carbon and PTFE moss².

What exactly are PTFE seals (commercially known as Teflon)? We, at Kofler – Dichtungen, aim to address this question in this article and further familiarize you with the characteristics and applications of polytetrafluoroethylene (PTFE).

1976—Subsec. (a). Pub. L. 94–455, §§ 501(b)(8), 503(b)(2), 1906(b)(13(A), substituted “entitled to take the standard deduction provided by section 141 (other than an individual described in section 141(e))” for “entitled to elect to pay the tax imposed by section 3” and “take the standard deduction” for “pay the tax imposed by section 3” and struck out provision relating to disallowance of section 37 credit in determination of tax imposed by section 3 of this title, and struck out “or his delegate” after “Secretary”.

Subsec. (b). Pub. L. 91–172, § 942(a), substituted provisions authorizing the Secretary to promulgate regulations to compute the tax in cases where the gross income is $10,000 or more, where the gross income from sources other than wages on which the tax has been withheld at the source is more than $100, where the taxpayer is entitled to a credit under section 37 of this title, or where the taxpayer does not elect the standard deduction, for provisions authorizing the computation of the tax in cases where the gross income is $5,000 but not more than $5,200, or where the gross income from sources other than wages on which the tax has been withheld at the source is more than $100, but not more than $200.

PTFE exhibits good impact resistance, yet it is relatively soft, not very stiff, and exhibits low hardness (Shore D 50-72). Teflon boasts exceptional sliding properties: the friction coefficient is very low.

Notably, the static friction coefficient and the dynamic friction coefficient are the same, meaning the transition from rest to motion happens smoothly, without jerking. The surface of PTFE is anti-adhesive, preventing it from bonding with sticky substances.

Teflon has an extremely high resistance to almost all chemicals. Even concentrated acids, alkalis, alkalis, alcohols, fuels, solvents, oxidants and ozone cannot harm PTFE. It is very weather resistant. Only the most extreme corrosive substances such as fluorine gas and molten alkali metals attack it.

We perform best under pressure! Personalized advice for the highest demands and a fast delivery guarantee ensure your satisfaction. Contact our sealing experts.

We perform best under pressure! Personalized advice for the highest demands and a fast delivery guarantee ensure your satisfaction. Contact our sealing experts.

As a seal manufacturer, you can easily order PTFE seals and special gaskets online from us. Kofler - Dichtungen supplies you with seals made of PTFE according to your requirements. We supply you with standard PTFE seals and special seals. We carry flat gaskets, O-rings, moulded parts, semifinished products and standard profiles in many sizes from 4 mm (0.15 inch) to 2,500 mm (98 inch) inner diameter. Our PTFE flat gaskets for flanges (flange gaskets) are shipped in different versions and as a special gasket with article number.

Teflon seals are used in food production because it is naturally stable to acidic media (e.g. beverage production) and it is approved for use in food production. In addition, the thermal conductivity can be greatly improved.

We will also be happy to send you our data sheet and seal pallet. In addition to PTFE, we also offer other elastomers (Viton, HPU, etc.) as well as flat seals made of stainless steel. Registered companies can order online in our online shop without VAT. Send us your request via our contact form. You will receive the products from your shopping cart with a short delivery time and will be able to book a positive shopping experience through good advice, fair shipping costs and fast processing of your order. We offer a wide range of seals, including standard profiles such as the Simmerring seal.

PTFE (Teflon) is a modern high-performance plastic and the most important fluoropolymer. Its unique features include an extreme operating temperature range, resistance to highly aggressive chemicals, low friction (sliding friction), and non-stick properties as a sealing material. Like POM and PEEK, PTFE is classified among thermoplastics, meaning it becomes moldable upon heating. A newer development is the rubber-elastic fluorocarbons FPM (FKM, brand name Viton) and FFKM (brand name Kalrez). They combine the elasticity of synthetic rubber, like EPDM, with the chemical stability and resistance of PTFE.

Due to its high chemical stability, PTFE is regarded as biocompatible and deemed physiologically safe. It is available in grades with FDA approval for use in the food industry and medical technology. Polytetrafluoroethylene can be blended with organic and inorganic materials, such as glass fibers or graphite, leading to new product characteristics differentiated by hardness, abrasion resistance, and compressive strength. PTFE also shields rollers and pistons against corrosion.

Subsec. (b)(4). Pub. L. 99–514, § 104(b)(16)(B), amended par. (4) generally, substituting “where the taxpayer claims a reduced standard deduction by reason of section 63(c)(5)” for “has an unused zero bracket amount”.

Amendment by Pub. L. 99–514 applicable to taxable years beginning after Dec. 31, 1986, see section 151(a) of Pub. L. 99–514, set out as a note under section 1 of this title.

Subsec. (b). Pub. L. 94–455, §§ 501(b)(9), 503(b)(3), 1906(b)(13)(A), struck out an introductory provision, “or his delegate” after “Secretary”, redesignated former par. (5) as (4), and as so redesignated, inserted reference to where the taxpayer elects the standard deduction but is subject to the provisions of section 141(e) (relating to limitations in case of certain dependent taxpayers). Former par. (4), which related to cases where the taxpayer is entitled to credit provided by section 37 of this title, was struck out.

When polytetrafluoroethylene is combined with organic or inorganic substances like graphite, glass fibers, or metal powder, it can further enhance product attributes, including hardness, abrasion resistance, or compressive strength.