Polyimide Sheet

What is Polyimide Sheet?

PI polyimide sheet is one of the most heat-resistant and refractory polymer plastics sheet, and polyimide sheet has excellent mechanical and physical properties at high temperatures. Polyimide can be thermosets or thermoplastics. Polyimide sheet has excellent electrical properties over a wide range of temperatures and humidities. The components of polyimide are also unaffected by dilute acids, aromatic and aliphatic hydrocarbons, esters, ethers, alcohols, freons, hydraulic oils and kerosene. Vespel® is a high performance polyimide material which is formed from resin manufactured only by DuPont.

Key Properties of Polyimide Sheet

Polyimide sheet has good thermal stability, good chemical resistance, excellent mechanical properties, low creep and high tensile strength, very good heat resistance and good Resistance to weak acidity.

Applications of Polyimide Sheet

Polyimide sheet can be used for mechanical stress damper, semiconductor test components, processing nesting (nest), microelectronic IC test socket (socket) and contactor, seals, pumps and valve assemblies, bearings and bushings, scientific instrument parts, other electronic components, Insulation and passivation layers and MEMS chip fabrication in digital semiconductors, bushings, bearings, sockets or structural parts of demanding applications.

Polyimide Grades and Colors

Vespil 7001

Vespil 7001 is unfilled natural polyimide sheet, it offers superior wear and insulation properties with operating temperatures from cryogenic to 300°C (570°F). Vespil 7001 has low electrical conductivity and the highest elongation and purity. Available as stock shapes can be ordered any time. For Vespil 7001 chemical resistance view our chart.

Vespil 7021

Vespil 7021 is the polyimide sheet filled with 15% graphite added to the base resin for increased wear resistance and reduced friction in applications such as plain bearings, thrust washers, seal rings, slide blocks and other wear applications. This compound has the best mechanical properties of the graphite-filled grades, but lower than the virgin grade

Vespil 7022

Vespil 7022 is the polyimide sheet filled with 40% graphite for enhanced wear resistance, lower friction, improved dimensional stability (low coefficient of thermal expansion), and stability against oxidation.

Vespil 70202

Vespil 70202 is the electrically conductive grade polyimide sheet. It is available in a sheet or plaque format. Vespil 70202 polyimide sheet has electric conductivity properties that make it the ideal option where the potential for static discharge is a concern. In addition, Vespil 70202 polyimide sheet can maintain a tolerance through multiple cycles in heats up to 300°C.

Vespil 70211

Vespil 70211 is the polyimide sheet filled with 10% PTFE and 15% graphite added to the base resin for the lowest coefficient of friction over a wide range of operating conditions. It also has excellent wear resistance up to 149 °C. Typical applications include sliding or linear bearings as well as many wear and friction uses listed above

Vespil SP-3

Vespil SP-3 is the polyimide sheet filled with 15% Mos2, it is used for wear and friction resistance in vacuum and other moisture-free environments where graphite actually becomes abrasive. Typical applications include seals, plain bearings, gears, and other wear surfaces in outer space, ultra-high vacuum or dry gas applications.

Vespil 5000

Vespil 5000 is an unfilled polyimide polymer that offers high modulus and surface hardness and improved dimensional stability. Compared to traditional polyimides, it offers better strength and stiffness at high temperatures.

Vespil 5050

Vespil 5050 is the polyimide which improves high temperature performance and wear resistance to allow for the replacement of metal and graphite parts. Vespil 5050 enable more efficient and durable systems, increased performance and reduced maintenance costs.

Vespil 7001 Properties

Properties	Test Methods	Typical Value	Test Unit
Density	ASTM D792	1.37	g/cm3
Water Absorption (24 hrs)	ASTM D570	0.7	%
Tensile Strength	ASTM D1708	100	mpa
Flexural Strength	ASTM D790	110	mpa
Tensile Elongation at Break	ASTM D638	6	%
Compressive Modulus	ASTM D695	2415	mpa
Thermal Conductivity 40°C	-	0.35	W/m·°C
Dielectric Constant at 1 MHz 23°C	ASTM D150	3.45	-
Shear Strength 23°C	ASTM D732	78	mpa