For Part numbers beginning with 5X-
When ordering standard Beryllium Copper Gaskets replace the second digit of the part number
(X) with a 5. To order the low compression Soft finger version, change the “X” to a 6.
Example: 5X - 71000 = 55 - 71000 (Standard)
56 - 71000 (Soft finger)
T-LANCE AND D-LANCE
Items requiring a “T” or “D” lance, add a “T” or “D” on the end of the part number. Also, add the
spacing dimension between lances: 500 for ½” or 100 for 1”
Example: For a “T” lance with 0.500” spacing --> 55-63000T500
Example: For a “D” lance with 1.000” spacing --> 55-62000D100
COILS
If BeCu coils are available, simply add the suffix code letter “C” to the part number.
Example: 55-51500C
PLATING
When ordering 5X- Beryllium Copper Gaskets with plating, refer to Table 5 below. Simply sub-
stitute the last two digits of the part number with the appropriate identification number of the
plating to specified.
Example: 55 - 520 00 --> 55-520 06 (Satin Tin Finish)
Table 5: (5X-)Plating Code Chart
Finish
Finish Code
(FF)
Finish
Finish Code
(FF)
Bright Finish 00 Dull Nickel 08
Gold 01 Electroless Nickel 09
Silver 02 Bright Nickel 10
Tin Lead 05 Zinc 12
Satin Tin 06 Zinc Chromate(Yellow) 13
Bright Tin 07 Zinc Chromate (Clear) 40
Parker Chomerics has two part numbering systems for its fingerstock product line.
Those part numbers beginning with 81- and 5X- are part of our fingerstock product family.
(Part numbers beginning with 5X- are from an acquisition)
Please contact Chomerics for any help you may need or visit www.chomerics.com
81 L
---
-
SF ST0A XXXXX CCCCCFFFF
Fingerstock PSA Adhesive
A = 1 for NO PSA
A = 2 for WITH PSA
Unique Chomerics
Configuration
(Tables 15 to 40)
Finish Code
(Table 1)
Soft Finger Option
if shown in Tables
15 to 37. Otherwise
left BLANK
Stainless Steel Option
if shown in Tables
15 to 32. Otherwise
left BLANK
Lance options
Availble in
Tables 17, 18 and 27
Otherwise
left BLANK
Cut part length to
whole number of
fingers, measured in
inches
Table 2: (81-) Part Number Examples
81-02-11818-2000 BeCu twist series fingerstock with PSA, configuration 11818, supplied with bright and clean finish, bulk format 16” long
81-02-11818-5000SF-00236
BeCu twist series fingerstock with PSA, configuration 11818, supplied with bright tin finish, Soft Finger 0.002” (0.05mm) thick, cut to 25 whole finger
lengths, which equates to 2.36” cut length.
81-02-11818-2000ST-01139
Stainless steel twist series fingerstock with PSA, configuration 11818, supplied bright and clean (only option for stainless steel), cut to 120 whole finger
lengths, which equates to 11.39” cut length.
81-01-14687-3000L-00141
BeCu edgemount twist series fingerstock with no PSA, configuration 14687, supplied with zinc/clear trivalent chromate finish, lance option, cut to 15
whole finger lengths, which equates to 1.41” cut length.
81-01-14623-4000L BeCu edgemount fingerstock with no PSA, configuration 14623, supplied with bright nickel finish, lance option, bulk format 16” long.
81-01-14623-4000SFL BeCu edgemount fingerstock with no PSA, configuration 14623, supplied with bright nickel finish, soft finger option, lance option, bulk format 16” long.
81-02-11817-5000-300 BeCu twist series fingerstock with PSA, configuration 11817, supplied with bright tin finish, 25 foot continuous coil which equates to 300” cut length.*
* Note that the -300 suffix is an exception to the CCCCC part length code rule
Shielding Effectiveness is typical. Customers should test for application specific concerns. Please
contact Chomerics Test Services Lab for testing.
Table 4: Typical Shielding Effectiveness
25% deflection in accordance with IEEE-STD-299 (modified) test procedure.
Material
H-Field
100 kHz
E-Field
10 MHz
Plane Wave
1 GHz
Finger Stock 110 dB 100 dB 90 dB
Softstock 95 dB 85 dB 75 dB
Table 3: Grouping Of Materials By Electromechanical Compatibility
ANODE
Group l Group lI Group lII Group lV
Magnesium
Magnesium Alloys
Aluminum
Aluminum Alloys
Zinc / Zinc Plating
Chromium Plating
Aluminum
Aluminum Alloys
Zinc & Zinc Plating
Chromium Plating
Cadmium Plating
Carbon Steel
Iron
Nickel & Nickel Plating
Tin & Tin Plating
Tin / Lead Solder
Cadmium Plating
Carbon Steel
Iron
Nickel & Nickel Plating
Tin & Tin Plating
Tin / Lead Solder
Lead
Brass
Stainless Steel
Beryllium Copper
Copper / Copper Alloys
Nickel / Copper Alloys
Brass
Stainless Steel
Beryllium Copper
Copper / Copper Alloys
Nickel / Copper Alloys
Monel
Silver
Graphite
Rhodium
Titanium
Platinum
Gold
CATHODE
Table 1: SPRING-LINE
®
Material & Plating Specifications
Material Specification Temperature Limit
Beryllium Copper ASTM B194 UNS C17200 -
Stainless Steel Type 301 -
Non-Conductive Acrylic PSA
(Shelf Life: 18 Months from Date of Manufacture)
3M F9469PC, 3M 9485PC, or equivalent -40°F to +250°F (-40°C to + 121°C)
Plating/Finish Finish Code (FFFF) Specification Thickness
Clean & Bright (Unplated) -2000 N/A N/A
Zinc/Clear Trivalent Chromate -3000 Similar to ASTM B633 0.0001” (0.0025mm) min.
Bright Nickel -4000 QQ-N-290, Class 2 0.0001” (0.0025mm) min.
Bright Tin (99%+ Tin) -5000 ASTM B545 0.0001” (0.0025mm) min.
Satin (Matte) Tin -5001 ASTM B545 0.0001” (0.0025mm) min.
Electroless Nickel -6000 MIL-C-26074, Class 1 0.0001” (0.0025mm) min.
Silver -7000 Similar to QQ-S-365, Type II, Grade A 0.0001” (0.0025mm) min.
Tin-Lead (60% / 40%) -8000 ASTM B579 0.0001” (0.0025mm) min.
Gold -9000 MIL-G-45204, Type II, Class 1, Grade C 0.00005” min. (0.0013mm) (Class 1)
Parker Chomerics Beryllium Copper and Stainless Steel Gaskets Ordering Procedure
Parker Chomerics beryllium-copper
(BeCu) and stainless steel EMI gaskets
(SPRING-LINE
®
) combine high levels
of shielding effectiveness with a broad
deflection range and low closure force
properties. The spring finger wiping action
can also help to reduce oxide build-up at
mating contact surfaces when the gasket is
used in applications demanding repeated
openings and closings. The excellent
performance qualities of beryllium-copper,
including: high tensile strength, extreme
operating temperature range and superb
electrical conductivity, make it an ideal
material for EMI shielding over a broad
frequency range. For applications that are
mechanically less demanding, stainless
steel gaskets offer good tensile strength,
extreme operating temperature range
and good electrical conductivity. Stainless
steel gaskets have higher compression
set than BeCu, when used in demanding
applications.
ENGINEERING YOUR SUCCESS.
01
02
Our BeCu shielding gaskets are avail-
able in four Parker Chomerics standard
finishes: clean and bright (unplated), zinc /
clear trivalent chromate, bright nickel, and
bright tin. These four finishes are RoHS
compliant. Other common finishes are
listed in Table 1 & 5 and are available upon
request. BeCu gasket finishes should be
chosen to minimize galvanic corrosion of
the final assembly, see Table 3.
Stainless steel gaskets are only available
with clean and bright (unplated) finishes.
BeCU and Stainless steel gasket shielding
effective properties are shown in Table 4.
Galvanic Compatibility
Galvanic corrosion occurs as electrons
move from dissimilar metals through an
electrolyte, such as water or salt spray
/ fog. The goal of an EMI gasket is to be
part of an electrically conductive shield
and the gasket material is typically mated
with a structural metal, such as aluminum
or stainless steel. Since BeCu or stainless
steel EMI gaskets are galvanically differ-
ent than aluminum or steel, there would
be two dissimilar metals in contact with
each other. If the assembly in the applica-
tion is susceptible to the presence of an
electrolyte, there is a high probability that
galvanic corrosion will occur, which will de-
grade both the structure and the shielding
effectiveness in the application. To reduce
the potential for corrosion, the electrical
potential difference between the two met-
als should be minimized. This is where the
availability of different finishes on BeCu
parts can help. For example, bright and
clean BeCu parts in contact with chem
filmed aluminum will typically corrode less
if they are finished with tin plating. Nickel
plated aluminum parts will work well with
nickel plated BeCu. As an added bonus,
among the current finishes we offer, nickel
plating is also very abrasion resistant.
Those applications with a lot of wear or
many cycles could benefit from a nickel
finish. Against zinc plated steel and zinc
castings, the use of zinc/clear trivalent
chromate parts is often used. See the
Electromechanical Compatibility Table 3 on
page 4 for further details.
For those applications where there is
no concern for corrosion, such as those
where there is no electrolyte present, then
the risk for galvanic corrosion is minimal.
In these applications a bright and clean
(unplated) finish will suffice and save finish
costs.