Text version of the page 
Standard Design Recommendations
Materials
This table lists the materials and material thicknesses that Minco has available.Minco’s standard materials are in boldface . If the material or thickness is not listed, consult Minco at 763.571.3121. M a t e ri al function M a t e ri al typ e Siz es /thic k n ess ava i lable Flexible insulator K a pton* and other polyimide films † 1/2 mi l ( 12.5µm ) , 1 mi l ( 25µm ) , 2 mi l ( 50µm ) , 3mi l ( 75µm ) , 5 mi l ( 125µm ) Rigid substrate (rigid-flex) FR-4 V a ri e ty of thic k n esses be tw ee n 0.003" ( 0.08mm )a nd 0.125" ( 3.18mm ) Polyimide Variety of thicknesses between 0.003" (0.08mm)and 0.125" (3.18mm) Conductor Copp e r 1/4 oz. ( 9µm ) , 1/3 oz. ( 12µm ) , 1/2 oz. ( 18µm ) , 1 oz. ( 35µm ) , 2 oz. ( 71µm ) , 3 oz. ( 107µm ) , 5 oz. ( 175µm ) , 7 oz. ( 254µm ) , 10 oz. ( 356µm ) Different forms of copper Half-hard, rolled-annealed, electro-deposited Beryllium copper 3 mil (75µm): half-hard and quarter-hard4 mil (100µm): half-hard Cupro-nickel (70/30 alloy) 0.625 mil (15µm), 0.9 mil (22µm), 1.3 mil (33µm),1.9 mil (48µm), 2.3 mil (58µm) Nickel 2 mil (50µm), 3 mil (75µm), 5 mil (125µm) Silver epoxy ‡ Adhesive § Modifi e d a cry l ic 1/2 mi l ( 12.5µm ) , 1 mi l ( 25µm ) , 2 mi l ( 50µm ) , 3mi l ( 75µm ) , 4 mi l ( 100µm ) Modified epoxy 1/2 mil (12.5µm), 1 mil (25µm), 2 mil (50µm), 3 mil(75µm), 4 mil (100µm) Phenolic Butyral 1 mil (25µm) Pr ess ur e - se n s iti ve a dh es i ve ( PSA ) 1 mi l ( 25µm ) , 2 mi l ( 50µm ) , 5 mi l ( 125µm ) Pr e -impr eg n a t e d m a t e ri al: FR-4, po l yimid e 2 mi l ( 50µm ) , 8 mi l ( 200µm ) Stiffener Copper, Aluminum, and other metals Variety of thicknesses available Polyimide glass See “Rigid substrate/Polyimide glass”above FR-4 V a ri e ty of thic k n esses be tw ee n 0.005" ( 0.13mm )a nd 0.125" ( 3.18mm ) Po l yimid e 1/2 mi l ( 12.5µm ) , 1 mi l ( 25µm ) , 2 mi l ( 50µm ) , 3mi l ( 75µm ) , 5 mi l ( 125µm )
*Kapton is a registered trademark of DuPont for polyimide. Dielectric strength of plain Kapton film is 3500-7000 volts/mil (0.025mm) depending upon materialthickness. Kapton/modified acrylic has a dielectric strength of 3500 volts/mil (0.025mm) and a temperature rating of -65 to 150°C, although circuits will dis-color after long-term exposure at 150°C. For special applications, Minco can use an adhesive that will withstand temperatures of 150°C continuous, and200°C short-term.†Other polyimide films are available for special applications.
‡Material is applied as an alternative to standard copper layers.
§In general, Minco recommends 0.001" (25µm) of adhesive on the cover material per 1 oz. (35µm) of copper (including plated copper). There may be special cir-cumstances where more is required. Consult Minco for details. 19