PTFE - Revision history

Designing Buildings at 07:26, 15 December 2020

2020-12-15T07:26:08Z

← Older revision		Revision as of 07:26, 15 December 2020
Line 61:		Line 61:
	* Transparent insulation materials.		* Transparent insulation materials.

−	[[Category:~~Projects_and_case_studies~~]] [[Category:~~DCN_Project_Knowledge~~]] [[Category:~~Research_/_Innovation~~]] [[Category:~~DCN_Research,_Development_and_Innovation~~]] [[Category:~~Construction_techniques~~]] [[Category:~~Design~~]] [[Category:~~Products_/_components~~]] [[Category:~~DCN_Product_Knowledge~~]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Projects_and_case_studies]] [[Category:Research_/_Innovation]] [[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]]

Designing Buildings at 06:40, 5 May 2019

2019-05-05T06:40:50Z

← Older revision		Revision as of 06:40, 5 May 2019
Line 7:		Line 7:
	= Introduction =		= Introduction =

−	Polytetrafluoroethylene (PTFE)~~, sometimes referred to as polytetrafluoroethene,~~ is a thermoplastic compound ~~material~~ noted for its very significant chemical inertness and heat resistance. Commonly encountered as a non-stick coating for pots and pans ~~(‘Teflon’),~~ it is ~~also~~ widely used for a variety of engineering and chemical applications~~. Syncolon is another popular brand~~.	+	Polytetrafluoroethylene (PTFE) is a thermoplastic compound noted for its very significant chemical inertness and heat resistance. Commonly encountered as a non-stick coating for pots and pans it is sometimes referred to by the trade name ‘Teflon’ or 'Syncolon'. It is widely used for a variety of engineering and chemical applications.

	= Properties of PTFE =		= Properties of PTFE =
−
−	* Very low friction coefficient
−	* Resists corrosion
−	* Significantly chemically inert
−	* Withstands wide temperature ranges
−	* Good abrasion resistance
−	* Non-porous

	PTFE is a synthetic fluoropolymer of tetrafluoroethylene discovered accidentally by Dr Roy Plunkett in 1938 while working for DuPont in the US. With a high molecular weight, it consists entirely of carbon and fluorine. Displaying reduced stress cracking and corrosion, it is also hydrophobic, which means it cannot be wetted by water or water-containing liquids. It also displays one of the lowest coefficients of friction of any solid so that even geckos and insects cannot crawl up it.		PTFE is a synthetic fluoropolymer of tetrafluoroethylene discovered accidentally by Dr Roy Plunkett in 1938 while working for DuPont in the US. With a high molecular weight, it consists entirely of carbon and fluorine. Displaying reduced stress cracking and corrosion, it is also hydrophobic, which means it cannot be wetted by water or water-containing liquids. It also displays one of the lowest coefficients of friction of any solid so that even geckos and insects cannot crawl up it.
		+
		+	Its properties include:
		+
		+	* Very low friction coefficient.
		+	* Resists corrosion.
		+	* Significantly chemically inert.
		+	* Withstands wide temperature ranges.
		+	* Good abrasion resistance.
		+	* Non-porous.

	= Uses in construction =		= Uses in construction =

−	Generally in construction and infrastructure, PTFE’s main applications are for providing friction-control performance wherever components move in relation to one another e.g in fabrication and erection of steelwork to minimise the stresses produced by the imperfect alignment of steel members; for expansion joints ~~in buildings~~, slide bearings, on bridge bearings and dams, gaskets and electrical insulation; also, as an insulator to prevent thermal bridging e.g where a pipe passes through an external wall.	+	Generally in construction and infrastructure, PTFE’s main applications are for providing friction-control performance wherever components move in relation to one another e.g in the fabrication and erection of steelwork to minimise the stresses produced by the imperfect alignment of steel members; for expansion joints, slide bearings, on bridge bearings and dams, gaskets and electrical insulation; also, as an insulator to prevent thermal bridging e.g where a pipe passes through an external wall.
		+
		+	As a lubricant, it reduces friction, wear and energy consumption (in machinery). This was exploited skilfully on the construction of the Millau Viaduct in southern France: PTFE-coated bearings were used to reduce the huge friction generated as the road deck was slid into place over the supporting pylons.
		+
		+	In 1972, PTFE-coated glass fabrics were introduced following their development by NASA for the manufacture of space suits. The Millennium Dome in London, comprises a double-layer PTFE-coated glass fabric membrane.

−	As a ~~lubricant~~, it ~~reduces friction~~, ~~wear and energy consumption (in machinery)~~. ~~This was exploited skilfully on the construction~~ of ~~the Millau Viaduct in southern France: Teflon~~-coated ~~bearings were used to reduce~~ the ~~huge frictions generated as~~ the ~~road deck~~ was ~~slid into~~ place ~~over the supporting pylons~~.	+	PTFE-coated glass is expensive but tends to have a longer life than PVC coated polyester, it is also stronger, adn self-cleaning. The first application of PTFE-coated glass was in the La Verne College Student Centre, in California (1973). In 1993, twenty years later, the original membrane was still in place, and was still capable of withstanding around 75% of its original design load.

−	Other developments have included woven PTFE fibre (hydrophobic, microporous, and extremely durable) for tensile structures. In 1972, PTFE-coated glass fabrics were introduced following their development by NASA for the manufacture of space suits. The Millennium Dome, London, comprises a double-layer PTFE-coated glass fabric membrane.	+	Other developments have included woven PTFE fibre (hydrophobic, microporous, and extremely durable) for tensile structures.

−	PTFE-coated glass is expensive but tends to have a longer life. The first application of PTFE-coated glass was in the La Verne College Student Centre, in California (1973). In 1993, twenty years later, the original membrane was still in place, and was still capable of withstanding around 75% of its original design load.	+	For more information see: Fabric structures.

−	Wiring in aerospace and computer applications ~~consume~~ about 50% of PTFE production, particularly as an insulator in connectors and cables. Other uses include gears, seals, gaskets and bushings, lining hose assemblies, windscreen wiper blades, ~~fabric protection, expansion joints and~~ industrial pipe lines, and as a waterproof coating for outdoor clothing.	+	Wiring in aerospace and computer applications consumes about 50% of PTFE production, particularly as an insulator in connectors and cables. Other uses include gears, seals, gaskets and bushings, lining hose assemblies, windscreen wiper blades, industrial pipe lines, and as a waterproof coating for outdoor clothing.

	PTFE is closely related to ETFE (ethylene-tetra-fluoro-ethylene) which comprises modified copolymers of ethylene and tetrafluoroethylene. It has many similar properties to PTFE and in recent years has been widely used in construction.		PTFE is closely related to ETFE (ethylene-tetra-fluoro-ethylene) which comprises modified copolymers of ethylene and tetrafluoroethylene. It has many similar properties to PTFE and in recent years has been widely used in construction.
Line 55:		Line 61:
	* Transparent insulation materials.		* Transparent insulation materials.

−	[[Category:Projects_and_case_studies]] [[Category:Research_/_Innovation]] [[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]]	+	[[Category:Projects_and_case_studies]] [[Category:DCN_Project_Knowledge]] [[Category:Research_/_Innovation]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Editor at 08:19, 10 April 2019

2019-04-10T08:19:28Z

← Older revision		Revision as of 08:19, 10 April 2019
Line 22:		Line 22:
	= Uses in construction =		= Uses in construction =

−	~~Reducing friction~~, ~~wear~~ and ~~energy consumption~~ of ~~machinery allows its use as a lubricant. This was exploited skilfully on~~ the ~~construction of~~ the ~~Millau Viaduct~~ in ~~southern France. Teflon-coated~~ bearings ~~were used to reduce the huge frictions generated~~ as ~~the road deck was slid into place over the supporting pylons~~.	+	Generally in construction and infrastructure, PTFE’s main applications are for providing friction-control performance wherever components move in relation to one another e.g in fabrication and erection of steelwork to minimise the stresses produced by the imperfect alignment of steel members; for expansion joints in buildings, slide bearings, on bridge bearings and dams, gaskets and electrical insulation; also, as an insulator to prevent thermal bridging e.g where a pipe passes through an external wall.

−	~~Other developments have included woven PTFE fibre (hydrophobic~~, ~~microporous~~, and ~~extremely durable~~) ~~for tensile structures~~. ~~Since 1972, PTFE~~-coated ~~glass fabrics~~ were ~~introduced following their development by NASA for~~ the ~~manufacture of space suits. The Millennium Dome, London, comprises a double-layer PTFE-coated glass fabric membrane~~.	+	As a lubricant, it reduces friction, wear and energy consumption (in machinery). This was exploited skilfully on the construction of the Millau Viaduct in southern France: Teflon-coated bearings were used to reduce the huge frictions generated as the road deck was slid into place over the supporting pylons.

−	~~PTFE-coated glass is expensive but tends to~~ have ~~a longer life~~. ~~The first application of~~ PTFE-coated glass ~~was in~~ the ~~La Verne College Student Centre, in California (1973)~~. ~~In 1993~~, ~~twenty years later~~, ~~the original~~ membrane ~~was still in place, and was still capable of withstanding around 75% of its original design load~~.	+	Other developments have included woven PTFE fibre (hydrophobic, microporous, and extremely durable) for tensile structures. In 1972, PTFE-coated glass fabrics were introduced following their development by NASA for the manufacture of space suits. The Millennium Dome, London, comprises a double-layer PTFE-coated glass fabric membrane.

−	~~Generally in construction and infrastructure, PTFE’s main applications are for providing friction~~-~~control performance wherever components move in relation~~ to ~~one another e~~.g in ~~fabrication and erection of steelwork to minimise~~ the ~~stresses produced by the imperfect alignment of steel members; for expansion joints~~ in ~~buildings~~, ~~slide bearings~~, ~~on bridge bearings and dams~~, ~~gaskets~~ and ~~electrical insulation; also, as an insulator to prevent thermal bridging e.g where a pipe passes through an external wall~~.	+	PTFE-coated glass is expensive but tends to have a longer life. The first application of PTFE-coated glass was in the La Verne College Student Centre, in California (1973). In 1993, twenty years later, the original membrane was still in place, and was still capable of withstanding around 75% of its original design load.

−	Wiring in aerospace and computer applications consume about 50% of PTFE production, particularly as an insulator in connectors and cables. Other uses include ~~bearings,~~ gears, seals, gaskets and bushings, lining hose assemblies, windscreen wiper blades, fabric protection, expansion joints and industrial pipe lines, and as a waterproof, coating for outdoor clothing.	+	Wiring in aerospace and computer applications consume about 50% of PTFE production, particularly as an insulator in connectors and cables. Other uses include gears, seals, gaskets and bushings, lining hose assemblies, windscreen wiper blades, fabric protection, expansion joints and industrial pipe lines, and as a waterproof coating for outdoor clothing.

	PTFE is closely related to ETFE (ethylene-tetra-fluoro-ethylene) which comprises modified copolymers of ethylene and tetrafluoroethylene. It has many similar properties to PTFE and in recent years has been widely used in construction.		PTFE is closely related to ETFE (ethylene-tetra-fluoro-ethylene) which comprises modified copolymers of ethylene and tetrafluoroethylene. It has many similar properties to PTFE and in recent years has been widely used in construction.

Editor at 18:41, 9 April 2019

2019-04-09T18:41:45Z

← Older revision		Revision as of 18:41, 9 April 2019
Line 42:		Line 42:
	* ETFE.		* ETFE.
	* Fabric structures.		* Fabric structures.
		+	* Millennium Dome.
	* Nylon.		* Nylon.
	* Plastic.		* Plastic.

Editor at 18:40, 9 April 2019

2019-04-09T18:40:41Z

← Older revision		Revision as of 18:40, 9 April 2019
Line 2:		Line 2:
	\| [[File:Earthday1.JPG\|link=File:Earthday1.JPG]]		\| [[File:Earthday1.JPG\|link=File:Earthday1.JPG]]
	\|-		\|-
−	\|	+	\| The Millennium Dome, London, comprises a double-layer PTFE-coated glass-fabric membrane.
−		+
	\|}		\|}

Editor at 18:34, 9 April 2019

2019-04-09T18:34:18Z

← Older revision		Revision as of 18:34, 9 April 2019
Line 1:		Line 1:
	{\|		{\|
−	\| [[File:Earthday1.JPG]]	+	\| [[File:Earthday1.JPG\|link=File:Earthday1.JPG]]
	\|-		\|-
	\|		\|
Line 41:		Line 41:
	* Carbon fibre.		* Carbon fibre.
	* Composites.		* Composites.
		+	* ETFE.
	* Fabric structures.		* Fabric structures.
	* Nylon.		* Nylon.

Editor: Created page with "{| | File:Earthday1.JPG |- | |} = Introduction = Polytetrafluoroethylene (PTFE), sometimes referred to as polytetrafluoroethene, is a thermoplastic compound material noted..."

2019-04-09T18:33:18Z

Created page with "{| | File:Earthday1.JPG |- | |} = Introduction = Polytetrafluoroethylene (PTFE), sometimes referred to as polytetrafluoroethene, is a thermoplastic compound material noted..."

New page

{|
| [[File:Earthday1.JPG]]
|-
|

|}

= Introduction =

Polytetrafluoroethylene (PTFE), sometimes referred to as polytetrafluoroethene, is a thermoplastic compound material noted for its very significant chemical inertness and heat resistance. Commonly encountered as a non-stick coating for pots and pans (‘Teflon’), it is also widely used for a variety of engineering and chemical applications. Syncolon is another popular brand.

= Properties of PTFE =

* Very low friction coefficient
* Resists corrosion
* Significantly chemically inert
* Withstands wide temperature ranges
* Good abrasion resistance
* Non-porous

PTFE is a synthetic fluoropolymer of tetrafluoroethylene discovered accidentally by Dr Roy Plunkett in 1938 while working for DuPont in the US. With a high molecular weight, it consists entirely of carbon and fluorine. Displaying reduced stress cracking and corrosion, it is also hydrophobic, which means it cannot be wetted by water or water-containing liquids. It also displays one of the lowest coefficients of friction of any solid so that even geckos and insects cannot crawl up it.

= Uses in construction =

Reducing friction, wear and energy consumption of machinery allows its use as a lubricant. This was exploited skilfully on the construction of the Millau Viaduct in southern France. Teflon-coated bearings were used to reduce the huge frictions generated as the road deck was slid into place over the supporting pylons.

Other developments have included woven PTFE fibre (hydrophobic, microporous, and extremely durable) for tensile structures. Since 1972, PTFE-coated glass fabrics were introduced following their development by NASA for the manufacture of space suits. The Millennium Dome, London, comprises a double-layer PTFE-coated glass fabric membrane.

PTFE-coated glass is expensive but tends to have a longer life. The first application of PTFE-coated glass was in the La Verne College Student Centre, in California (1973). In 1993, twenty years later, the original membrane was still in place, and was still capable of withstanding around 75% of its original design load.

Generally in construction and infrastructure, PTFE’s main applications are for providing friction-control performance wherever components move in relation to one another e.g in fabrication and erection of steelwork to minimise the stresses produced by the imperfect alignment of steel members; for expansion joints in buildings, slide bearings, on bridge bearings and dams, gaskets and electrical insulation; also, as an insulator to prevent thermal bridging e.g where a pipe passes through an external wall.

Wiring in aerospace and computer applications consume about 50% of PTFE production, particularly as an insulator in connectors and cables. Other uses include bearings, gears, seals, gaskets and bushings, lining hose assemblies, windscreen wiper blades, fabric protection, expansion joints and industrial pipe lines, and as a waterproof, coating for outdoor clothing.

PTFE is closely related to ETFE (ethylene-tetra-fluoro-ethylene) which comprises modified copolymers of ethylene and tetrafluoroethylene. It has many similar properties to PTFE and in recent years has been widely used in construction.

= Related articles on Designing Buildings Wiki =

* Acrylic.
* Architectural fabrics.
* Carbon fibre.
* Composites.
* Fabric structures.
* Nylon.
* Plastic.
* Polycarbonate plastic.
* Polyethylene.
* Tensile structures.
* The history of fabric structures.
* The development of structural membranes.
* The Millau Viaduct.
* The structural behaviour of architectural fabric structures.
* The thermal behaviour of spaces enclosed by fabric membranes.
* Transparent insulation materials.

[[Category:Projects_and_case_studies]] [[Category:Research_/_Innovation]] [[Category:Construction_techniques]] [[Category:Design]] [[Category:Products_/_components]]