Parker-Chomerics-CMT-HT-108-1500

Part #	Parker-Chomerics-CMT-HT-108-1500
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CHO-MASK II

Conductive Foil Tape with Peel-Off Mask

for Painting Operations

Customer Value Proposition

Parker Chomerics CHO-MASK

Conductive Foil

pe is available in

Standard

ck (ST) and High

(HT) versions, providing an electrically

conductive, non-corroding surface on

painted metal electronic enclosures.

CHO-MASK II tapes consist of recessed

polyester paint masking ﬁlm covering a

layer of either 1 oz (28.4 g) or 2 oz (56.7 g)

tin-plated copper foil. The back of the foil

features a conductive pressure sensitive

adhesive (PSA). CHO-MASK II tape is

applied to clean metal frame, door and

panel surfaces where electrical continuity

is required.

After painting, the peel-off mask is easily

removed, allowing the paint to seal both

Product Features

•

Foil tape meets MIL-

–

47012

•

More cost-effective and

environmentally friendly than

plating and coating methods

edges of the foil laye

he foil imparts a

clean, electrically conductive path from

the panel, through an EMI gasket, to the

cabinet frame. It also provides grounding

points within the enclosure.

•

Tin-plated on foil meets

MIL-

–

10727

•

Peel-off mask is removed easily

•

Pressure sensitive adhesive contains

highly stable, conductive particles

for long-term reliability

any time, at any temperature

•

Mask is recessed from edges

for paint overlap and corrosion

protection

•

Provides effective EMI shielding

performance when used in

conjunction with Parker Chomerics

EMI gaskets

•

Solvent/chemical resistant

Contact Information

•

Maintains performance after

10,000 door closure cycles

Parker Hanniﬁn Corporation

Chomerics Division

77 Dragon Court

Typical Applications

•

Enclosure enclosures

•

Passes MIL-STD-810

Salt Fog testing

Woburn, MA 01801

•

Painted cabinets and boxes

phone 781 935 4850

fax 781 933 4318

chomailbox@parke

com

•

Doors and ﬂanges or other

mating seams

www.parker.com/chomerics

CHO-MASK

II – Product Information

Table 1 – Technical Data

Typical Properties

CHO-MASK II ST (Standard Tack)

CHO-MASK II HT (High Tack)

Test Method

1 oz Tin-Plated Copper Foil

2 oz Tin-Plated Copper Foil

Foil Options

Visual

1 oz = 1.4 mils (0.04 mm)

2 oz = 2.8 mils (0.07 mm)

Foil/Fabric Thickness, mils (mm)

Visual

Masking Film

Polyester

Chomerics

Visual

Adhesive Type

Electrically Conductive, Pressure-Sensitive Acrylic

Adhesive Thickness, mils (mm)

1.8 (0.05)

2.0 (0.05)

Visual

1 oz = 3.2 (0.08)

2 oz = 4.6 (0.12)

1 oz = 3.0 (0.08)

2 oz = 4.8 (0.12)

Total Thickness

, mils (mm)

ASTM-D1000

Temperature Range, ˚F (˚C)

-40 to 180 (-40 to 82)

<200

Chomerics

Chomerics TM 71

Electrical Resistance

, milliohms

Flammability Resistance

510

Adhesion Foil to Cabinet Substrate

Adhesion

Mask to Foil, oz/in (N/m)

See Table 2

24 (263)

ASTM-D1000

Adhesion After Heat Aging, lbs/in (N/m),

48 hours @ 365˚F (185˚C)

2.8 (490)

ASTM-D1000

Corrosion Resistance

Chemical Resistance

Humidity Exposure

Pass

MIL-STD-810

ASTM-D896-84

ASTM-D1001

Gasket Closure Cycling (10,000 cycles,

15% deﬂection)

See Table 4

Chomerics TR 40

Chomerics

Shelf Life, months from date of shipment

^{1
Adhesive and foil total thickness}

^{2
After bake}

^{3
Salt Fog Chamber at 35
0
C, 144 hrs (CHO-MASK II tape adhered to steel plated, painted)}

^{4
Withstands 1,1,1 Trichloroethane, ethanol, acids, cleaning solvents, and alkaline solutions without degradation}

^{5
Tested at 60
0
C, 96 hrs, 95% RH}

Application differences between CHO-MASK II ST and HT tape versions are shown below.

CHO-MASK II ST

CHO-MASK II HT

•

Oven bake under 350°F (177°C)

•

Suitable for ﬂat ﬂange and radius applications

•

No length restriction

•

Oven bake up to 400°F (204°C) for 1 hour

•

Suitable for knife edge, radius and ﬂat surface applications

•

Lengths of <5 ft above 350°F (177°C) recommended

CHO-MASK

II – Product Information

Table 2 – Typical Post Bake Adhesion for ST and HT Versions

(Tin-plated copper tape to cabinet substrate)

To Aluminum

lbs/in (N/m)

To Steel

lbs/in (N/m)

Test Environment

Baked 1 hour @ 350˚F (177˚C)

4.0 (700)

5.1 (893)

3.1 (543)

4.1 (718)

3.9 (683)

5.0 (875)

3.0 (525)

4.0 (700)

Baked 1 hour @ 400˚F (204˚C)

Baked 48 hours @ 350˚F (177˚C)

Baked 168 hours @ 165˚F/95% RH (74˚C)

Table 3 – CHO-MASK

II – Dimensions

Figure 1 – CHO-MASK

II – Construction

If “A” is…

If “B” is…

.265 in (.67 cm)

.335 in (.85 cm)

.460 in (1.17 cm)

.585 in (1.48 cm)

.635 in (1.61 cm)

.835 in (2.12 cm)

1.335 in (3.40 cm)

1.585 in (4.03 cm)

.083 in.

(2.1 mm)

.430 in (1.09 cm)

.500 in (1.27 cm)

.625 in (1.59 cm)

.750 in (1.91 cm)

.800 in (2.03 cm)

1.000 in (2.54 cm)

1.500 in (3.81 cm)

1.750 in (4.44 cm)

Polyester Paint Mask

1 oz. or 2 oz.

Tin-Plated Copper

Conductive

Adhesive

Release Liner

Table 4 – Adhesion Resistance

(10,000 door closure cycles at 15% deﬂection of various Chomerics EMI gaskets)

EMI Gasket Type

Test Results

Pass

Comments

Conductive fabric

No defects/abrasions

SPRING-LINE

™

beryllium copper

Ag/Cu ﬁlled silicone elastomer

Ag/Al ﬁlled silicone elastomer

Ag ﬁlled silicone elastomer

Pass

Ag/Ni ﬁlled silicone elastomer

Ag/glass ﬁlled silicone elastomer

Ag/Cu ﬁlled ﬂuorosilicone elastomer

Ag/Al ﬁlled ﬂuorosilicone elastomer

Ag ﬁlled ﬂuorosilicone elastomer

Ferrex

* knitted wire mesh

Pass

Monel** knitted wire mesh

Pass

Monel knitted wire mesh with urethane

foam core (SOFT-SHIELD

gasket)

Pass

No defects/abrasions

Aluminum knitted wire mesh

* Tin-plated copper clad steel

** Nickel copper alloy

CHO-MASK

II – Product Information

CHO-MASK II Shielding Effectiveness (E-Field) with Various EMI Shielding Gaskets

Shielding effectiveness tests are performed using standard 2 oz CHO-MASK tape.

Figure 2

Figure 3

Wire Mesh Gaskets

Conductive Elastomers

Above Instrumentation

120

110

100

120

110

Above Instrumentation

FERREX

ALUMINUM

SOFT-SHIELD®

100

CHO-SEAL

1215

CHO-SEAL

1285

MONEL

100

500

1000

1500

2000

500

1000

1500

2000

100

200

Frequency (MHz)

Table 5 – Shielding Effectiveness

Gasket Type and Description

Table 6 – Shielding Effectiveness

Gasket Type and Description

Frequency (MHz)

100

200

500 1000

2000

100

200

500 1000

2000

CHO-SEAL

1215

Silver-plated-copper ﬁlled silicone

elastomer EMI gasket

SOFT-SHIELD

3500

Knitted wire mesh with urethane foam

core EMI gasket

110

107

112

120*

CHO-SEAL

1285

Silver-plated-aluminum ﬁlled silicone

elastomer EMI gasket

Aluminum

Knitted wire mesh EMI gasket

106

110

112

110

120*

Ferrex

* Beyond limit of instrumentation

Knitted wire mesh EMI gasket

Monel

Knitted wire mesh EMI gasket

* Beyond limit of instrumentation

CHO-MASK

II – Application Information

Suggested Application Procedure

u will need:

Cotton Cloth or Rag • Industrial Cleaner (such as toluene) • Rubber Gloves • Roller • Cutting Instrument (razor blade)

Approximately

.060 in gap

between strips

STꢀP 1

STꢀP 3a

STꢀP 4b

Step 3a:

The excess tape in each

corner should now be trimmed. It is

not necessary to overlap the tape in

the corners. It is recommended that

a gap be left between the vertical

and horizontal strips. The gap should

measure about .080 in (2.0 mm) wide

(which is equivalent to the recessed

edge of the tape). Late

hen paint

is applied to the cabinet this gap will

be ﬁlled and serve to edge seal the

tape ends.

Step 4b:

Using a similar tool as

Step 1:

nsure maximum adhesion,

remove all surface oils and dust. In large

volume applications, proceed through

your normal automated cabinet cleaning

procedures. Note that phosphatizing can

render cabinet surfaces nonconductive.

It is recommended that you monitor the

surface resistivity of the cabinet ﬂange

(surface resistivity should be <100

mOhms).

pictured in Step 4b, touch down the

exposed tinned copper edges until they

are ﬂat and even.

Note: Only moderate

pressure is required (about 5 psi).

In small volume applications, clean cabinet

ﬂanges thoroughly with a cloth dampened

with an industrial cleaner (acetone, toluene,

or isopropyl alcohol). Wear rubber gloves,

so cleaning

agent do not come in contact

with the skin.

STꢀP 5

Step 5:

Cabinet is ready for normal

phosphatizing and painting. Follow

the manufacturer

’

nstructions for

paint application and curing.

Note:

Recommended paint thickness,

including prime

s 4 mils (0.1 mm)

or more.

IMPORTANT: Avoid contact with or

handling of the adhesive. Oils from

the hand will affect adhesion.

STꢀP 3b

Step 3b:

Using the X-Acto knife, cut

about a .080 in (2.0 mm) piece of the

mask layer on each strip and remove.

This will further ensure edge sealing

when the cabinet is painted.

Note: If oxidation or rust is present,

abrade surface with sandpaper to

expose clean metal before cleaning.

STꢀP 6

Step 6:

When the cabinet has reached

room temperature, remove the mask at

a 180° angle from the foil tape leaving

a clean, conductive grounding surface.

Note: Mask is easily removed at room

temperature, with or without baking.

STꢀP 2

STꢀP 4a

Step 2:

Still wearing rubber gloves, peel

away the release liner and apply the

tape to cabinet ﬂanges being careful to

avoid wrinkles. Extend the tape beyond

the corners and cut away excess. This

prevents residual stress in foil from lifting

tape at ends. Run a ﬁnger along the mask

to provide initial adhesion.

Step 4a:

Smooth over the surface of

the tape with a small rubber rolle

Picture 1 – Proper

way to remove

CHO-MASK mask

CHO-MASK

II – Application Information

Table 7 – Troubleshooting Problems in Applications

Problem

Possible Causes

Solutions

Make sure that Steps 2, 3a, and 3b are

completed properly.

Ends of the tape are lifting up.

Improper application, corner termination

Using the cabinet edge as reference, apply the

tape in straight segments. Also be sure that

Steps 4 and 6 are completed properly.

Tape not being applied in straight segments.

Tape not adequately adhered to ﬂange.

Tape wrinkles during application.

Paint should be applied in a thickness of 4 mils

(0.1 mm) or greater.

Voids in paint are appearing along the tape edges.

Tape is not sticking well to the cabinet.

Paint has been applied too thin.

Oil, dust, contamination. Cabinet not cleaned

properly. Not enough pressure was used with

the applicator along the edges of tape.

Make sure Step 1 is completed properly.

See Step 4 for use of applicator.

Splice found in CHO-MASK II tape roll, or ran out

of tape before completing ﬂange.

Start new strip. Leave .060 in (1.5 mm) gap

between both pieces.

N/A

Recess the mask manually by cutting and

removing about 0.125 in (3 mm).

Design requires paint overlap at cut ends.

Mask not recessed in this area.

Ordering Information

Table 8 – Part Numbering – standard rolls

CMT

XXXX

108

XXX

CHO-MASK

Tape Family

Material

Roll Length

yards (m)

Width

in (cm)

ST = Standard Tack

HT = High Tack

STI = For 1 oz copper

HT1 = For 1 oz copper

0430 = 0.430 (1.09)

0500 = 0.500 (1.27)

0625 = 0.625 (1.59)

0750 = 0.750 (1.91)

0800 = 0.800 (2.03)

108 (97)

1000 = 1.000 (2.54)

1500 = 1.500 (3.81)

1750 = 1.750 (4.44)

Alternate constructions and non-standard roll sizes are available.

Please contact Parker Chomerics Application Engineering for details.

www.parker.com/chomerics

CHOMERICS, CHO-MASK, CHO-SEAL and SOF

–

SHIELD are registered trademarks of Parker Hanniﬁn Corporation.

TB 1043 EN February 2022

Parker-Chomerics-CMT-HT-108-1500

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