3M 4945 双面胶带

3M 4945双面胶带

VHBÔ

4945 Acrylic Foam Tape

Product Data Sheet

Updated : March 1996

Supersedes : October 1993

Product Description VHB Joining Systems utilise

firm acrylic adhesives which

have excellent long term

holding power. The peel

adhesion and tensile

holding power

of products in the VHB

family are significantly

higher than typical pressure

sensitive tape products.

Resistance to solvents,

temperature extremes, and

U.V. light make VHB

products suitable for many

interior and exterior

applications.

Physical Properties

Not for specification purposes

Adhesive Type Acrylic 3M ref : A-30

Thickness (ASTM D-3652)

Tape

Liner

Total

1.1 mm

0.08 mm

1.18 mm

Foam Density 800 kg/m³

Adhesive Carrier Acrylic Foam cc

Release Liner Red Plaid Printed Paper

Tape Colour White

Shelf Life 24 months from date of despatch by 3M when stored in the

original carton at 21°C (70°F) & 50 % Relative Humidity

Performance

Characteristics

Not for specification purposes

Peel Adhesion to

Stainless Steel

90° peel @ room temp, 72 hr dwell,

jaw speed 300mm/min

44 N/10mm

Static Shear Strength

weight held for 10,000 mins to stainless

steel with ½ sq in (3.23 sq cm) overlap

1500 g @ 20°C

500 g @ 66°C

500 g @ 93°C

Normal Tensile (TBlock)

to Aluminium at room temp,

6.45 sq cm, jaw speed 50 mm/min

97 N/cm²

2

Date : March 1996

4945 Acrylic Foam Tape

Performance

Characteristics (Cont...)

Not for specification purposes

Temperature

Performance

(Minutes/Hours)

(Days/Weeks)

150 °C

93 °C

Solvent Resistance

Splash testing cycle - 20 seconds

submersion - 3 cycles.

No apparent degradation when exposed to splash testing of

most solvents including gasoline, JP-4 jet fuel, mineral

spirits, motor oil, ammonia cleaner, acetone, methyl ethyl

ketone. 20 seconds air dry.

UV Light Resistance Excellent.

Additional Product

Information

Bond strength is dependent

upon the amount of

adhesive-to-surface contact

developed. Firm application

pressure develops better

adhesive contact and thus

improves bond strength.

To obtain optimum

adhesion, the bonding

surfaces must be clean, dry

and well unified. Typical

surface cleaning solvents

are isopropyl alcohol/water

mixture (rubbing alcohol) or

heptane. Use proper safety

precautions for handling

solvents.

It may be necessary to seal

or prime some substrates

prior to bonding.

a. Most porous or fibred

materials (e.g. wood)

will require sealing to

provide a unified

surface.

b. Some materials (e.g.

copper, brass,

plasticised vinyl) will

require priming or

coating to prevent

interaction between

adhesive and substrates.

Ideal tape application

temperature range is 20 to

38°C. Initial tape

application to surfaces at

temperatures below 10°C is

not recommended because

the adhesive becomes too

firm to adhere readily.

However, once properly

applied, low temperature

holding is generally

satisfactory.

In some cases bond

strength can be increased

and ultimate bond strength

can be achieved more

quickly by exposure of the

bond to elevated

temperatures (e.g. 65°C for

one hour). This provides

better adhesive wetout on to

the substrates.

Applications VHB Joining Systems are

suited for use in many

interior and exterior

industrial applications. In

many situations, they can

replace rivets, spot welds,

liquid adhesives and other

permanent fasteners. Each

product in the VHB family

has specific strengths.

These can include high

tensile, shear and peel

adhesion and resistance to

solvents, moisture and

plasticiser migration. All

VHB tapes should be

thoroughly evaluated by the

user under actual use

conditions with intended

substrates, especially if

expected use involves

extreme environmental

conditions.

VHB Joining Systems are

suitable for bonding a

variety of substrates,

including sealed wood,

many plastics, composites

and metals. Plastics which

can be a problem are

polyethylene, polypropylene,

teflon, silicones and other

low surface energy

materials.

Galvanised surfaces are

potential problems and

should be carefully

evaluated.

To prevent corrosion on

copper and brass, only

lacquer coated material

should be used within VHB

Joining Systems.

Thorough evaluations are

recommended when

bonding is required to any

questionable surface.

3

Date : March 1996

4945 Acrylic Foam Tape

Special Feature

Products

4945 has very good

plasticiser resistance and

adhesion to vinyl. Because

of the wide variation in vinyl

formulation, however,

evaluation must be

conducted with the specific

vinyl used to insure that

performance is satisfactory.

Problems related to

plasticiser migration can

often be predicted by

accelerated ageing at 65°C

for one week.

4945 Feature

Acrylic Foam Tape 4945

utilises an acrylic adhesive

which provides excellent

adhesion to many paint

finishes and plasticised

vinyls.

Adhesion to painted

surfaces.

There is a wide variety of

paint systems available and

specific recommendations

cannot be made. For

painted surface, Acrylic

Foam Tape 4945 should be

evaluated along with other

VHB Tape products.

Adhesion to plasticised

materials.

Plasticisers are common

ingredients in many soft,

flexible plastics. These

plasticisers can migrate into

adhesives causing a

reduction in bond strength.

Adhesive bond performance

is dependent on the types

and concentrations of

plasticisers used in the

plastic formulation. Acrylic

Foam Tape 4945 is

resistant to migration of

many plasticisers and

should be evaluated for

applications requiring

bonding to flexible plastics.

Underwriters Laboratories

(U.L.) Recognition

U.L. 746-C Temperature

Rating

Substrate Temperature (°C)

Unplasticised (Nylon 6-6)

ABS and Polycarbonate

Polyamide (Nylon 6-6)

Galvanised Steel and

Aluminium

Enamelled Steel and

Phenolic

75

90

90

110

110

3M and VHB are trademarks of the 3M Company.

Values presented have been determined by standard test methods and are average values not to be used for specification purposes.

Our recommendations on the use of our products are based on tests believed to be reliable but we would ask that you conduct your own tests to

determine their suitability for your applications.

This is because 3M cannot accept any responsibility or liability direct or consequential for loss or damage caused as a result of our

recommendations.

Specialty Tapes & Adhesives Ó 3M United Kingdom PLC 1996

3M United Kingdom PLC

3M House,

28 Great Jackson Street,

Manchester,

M15 4PA

Customer Service :

Tel 0161 236 8500

Fax 0161 237 1105

3M Ireland

3M House, Adelphi Centre,

Upper Georges Street,

Dun Laoghaire,Co. Dublin,

Ireland

Customer Service :

Tel (01) 280 3555

Fax (01) 280 3509