Technical Data Sheet

MASTER BOND MB SERIES CYANOACRYLATES

High Strength, Rapid Curing Cyanoacrylate Adhesives for Reliable Cost Effective Bonding

Product Description

      Master Bond cyanoacrylate adhesives are high strength, rapid curing, one component systems which offer ultra-fast bonding at room temperature with no mixing or heating required.  Only contact pressure is needed after application of the adhesive. They generally bond from within a few seconds to just under a minute, depending on atmospheric humidity and the substrates being bonded.  Cyanoacrylates adhere well to many substrates including metals, rubbers, most plastics and ceramics.  The bonds produced offer exceptional performance characteristics including resistance to most types of environmental exposures, moderate heat, aging and many different chemicals, as well as high strength and fatigue resistance.  Master Bond cyanoacrylates offer versatility, strength, speed of cure as well as cost effectiveness both for production and repair applications. 

      Master Bond offers methyl, ethyl and various specialty grades of cyanoacrylate adhesives.  The methyl grades are recommended for optimal performance on metal-to-metal applications. The ethyl grades offer excellent bonding with rubbers, most plastics and also rubber or plastic to metal applications.  Included among the specialty types are medical grades (biocompatible), flexibilized systems, gels and low odor (methoxymethyl) cyanoacrylates.

      Master Bond cyanoacrylate adhesives are attractive not only technically but economically. The best quality bonds are usually obtained by using the minimum quantity of adhesive needed to fill the joint.  The thinner the adhesive film, the faster the cure and the stronger the bond.  Depending on the size of the bond, one ounce of adhesive properly used can provide enough material for as many as 2000 bonds.

Product Advantages

·    Rapid curing at room temperature.  No heat required.  Most bonds formed in under a minute.

·    Bonds with only contact pressure.  No clamping or fixturing required

·    Bonds well to a wide variety of substrates including metals, rubbers, most plastics and ceramics.

·    Excellent wetting action with no solvent evaporation or hazardous vapor emission.

·    High strength bonds.  Tensile strengths up to 4,000 psi.

·    Good resistance to weathering.

·    Resists many chemicals including gasoline, kerosene & various oils.

·    Easily applied. Spreads evenly and smoothly.  No mixing required.

·    Most surfaces require no special pretreatments.

·    Ideal for high speed production.  Automatic dispensing equipment readily available.

·    Cost effective.  Only minimal amounts of adhesive are needed to form strong bonds.

·    Meets MIL-A-46050B specification:                     ·  Meets MIL-A-46050C specification:

Type I, class 1— MB300, MB301, MB325                  Type I, class 1 — MB303, MB320, MB325

Type I, class 2 — MB302, MB303                             Type II, class 1 — MB300

    Type II, class 2 — MB301, MB302

    Type II, class 3 — MB295, MB297

    Type IA and IIA — Master Bond Accelerator for

                                                                              Cyanoacrylate Adhesives.

Product Properties

      Basic physical and chemical properties of Master Bond cyanoacrylate adhesives are summarized in table #1.  Aside from the properties mentioned it should be noted that ethyl type cyanoacrylates are dissolved by acetone, methyl ethyl ketone, nitromethane and dimethylformamide. Methyl types are dissolved only by strong polar solvents such as nitromethane and also dimethylformamide.

      Table #2 summarizes cyanoacrylate bond strengths to a variety of similar and dissimilar substrates.  Additionally, information on typical chemical resistance properties is also included.  All Master Bond cyanoacrylates form colorless and transparent bonds.  

Preparation of Adhesive and Bonding Surfaces

      Master Bond cyanoacrylates can be readily applied to various surfaces straight from the bottle as supplied.  Simple finger pressure or the equivalent is enough to bond the substrates together. For maximum bond strengths the parts should be cleaned.  Cyanoacrylates need tight, closely fitted surfaces for maximum bond strengths.  Usually a light sanding followed by solvent wiping of the surfaces with acetone, MEK or alcohol is sufficient.  Other than cleaning, special extensive pretreatments of surfaces are generally not required.  It should be noted that plastic surfaces sometimes require some mechanical roughening to remove certain mold release agents.  A compatible solvent wash with acetone, MEK or alcohol is usually adequate to provide suitable quality bonding surfaces.

Adhesive Application and Assembly

      High bond strengths with cyanoacrylates require only a very thin film of adhesive.  The exact amount of adhesive to be used for bonding a specific area depends on the type of surface and the materials to be bonded.  It is only necessary to apply adhesive to one surface.  Generally, the best bond strength can be achieved by using the minimum amount of adhesive required to fill the joint.  Pressure should be applied evenly until the adhesive sets up in order to ensure uniform bonding thickness.  The thinner the adhesive film, the faster the cure and the stronger the bond.  Cyanoacrylates cure by atmospheric humidity.  Therefore the higher the humidity the faster the cure.  Conversely, in low humidity environments, the rate of cure will be slower.

Handling and Storage

      Master Bond cyanoacrylate adhesives should be stored in their original containers in a cool, dry location.  The storage temperature should be below 75°F.  The shelf life depends on the storage temperature.  The maximum shelf life of 12 months is obtained if the original containers are stored in a refrigerator at 35° to 40°F.  Exposure to sunlight should be avoided.  Containers should be tightly sealed when not in use.  When removing an adhesive container from the refrigerator, allow the adhesive to reach room temperature before using it.  Excessively aged or outdated adhesive may appear cloudy or milky.  If this occurs the material should not be used.

Caution

      Cyanoacrylates have been used in industry for years with a truly excellent safety record.  Dispensing the adhesive by hand from a bottle as well as with automatic dispensing equipment has given excellent results.  As noted earlier, this adhesive cures by the presence of moisture.  In light of this, certain precautions must be taken to insure safe and trouble free usage.  Use of gloves is mandatory since skin contains moisture and accidental misuse may bond skin.  In case this occurs, do not attempt to force bonded surfaces apart.  Flush immediately with water until the joined parts can be freed.  Should any adhesive material get into the eyes, wash with plenty of water and then consult a doctor.  Do not use acetone or rub eyes. Use applicator nozzles and gloves to avoid skin contact.  Although most cyanoacrylates are low odor, it is still recommended to use adequate ventilation, especially in a production environment.

Master Bond Inc.

Adhesives, Sealants & Coatings • 154 Hobart Street • Hackensack, N.J.  07601 • Tel: 201-343-8983

Notice:  Master Bond believes the information on the data sheets is reliable and accurate as is technical advice provided by the company.  Master Bond makes no warranties (expressed or implied) regarding the accuracy of the information, and assumes no liability regarding the handling and usage of this product.                                                                                                            D219


Table #1: MASTER BOND MB SERIES CYANOACRYLATE APPLICATION SELECTOR GUIDE

Selected High Strength, Rapid Curing Cyanoacrylate Adhesives for Reliable, Cost Effective Bonding

Partial Listing Only –— Other Grades Available

Ethyl Cyanoacrylate —

  


Master Bond
Grade


Viscosity
RT, cps



Color


Specific
Gravity


Hardness
Shore A

Refractive Index
(ND 20°C)

Dielectric Constant
(1,000 Hz)


Set-Up Time
Seconds, RT*


Service Temp Range, °F



Applications

MB295

1,300-1,700

transparent

1.05

85

1.47

3.6

20-40

-60 to +195°F

wire tacking, fills gap to 0.007”

MB297

2,200-2,400

transparent

1.09

85

1.48

3.5

20-50

-60 to +195°F

general purpose, fills gap to 0.008”

MB300

2-3

transparent

1.05

85

1.45

3.7

5-20

-60 to +195°F

general purpose wicking grade, fills gap to 0.002”

MB301

30-40

transparent

1.05

85

1.46

3.6

5-25

-60 to +195°F

general purpose tight fit grade, fills gap to 0.004”

MB302

75-100

transparent

1.05

85

1.46

3.6

20-40

-60 to +195°F

for rubber & plastic bonding, fills gap to 0.005”

Methyl Cyanoacrylate —

  


Master Bond
Grade


Viscosity
RT, cps



Color


Specific
Gravity


Hardness
Shore A

Refractive Index
(ND 20°C)

Dielectric Constant
(1,000 Hz)


Set-Up Time
Seconds, RT*


Service Temp Range, °F



Applications

MB303

80-100

transparent

1.08

90

1.49

3.6

25-45

-60 to +225°F

for metals with tight fit, fills gap to 0.005”

MB320

500-550

transparent

1.09

85

1.50

3.6

30-45

-60 to +225°F

general purpose metal bonding, fills gap to 0.007”

MB325

15-25

transparent

1.08

90

1.49

3.7

25-40

-60 to +225°F

wicking type metal bonding, fills gap to 0.002”

Specialty Cyanoacrylate —

  


Master  Bond
Grade


Viscosity
RT, cps



Color


Specific
Gravity


Hardness
Shore A

Refractive Index
(ND 20°C)

Dielectric Constant
(1,000 Hz)


Set-Up Time
Seconds, RT*


Service Temp Range, °F



Applications

MB297FL

1,500-1,800

transparent

1.07

85

1.47

3.3

10-50

-65 to +185°F

vibration & shock resistant, fills gap to 0.007”

MB297GEL

gel

transparent

1.10

90

N/A

3.4

60-80

-60 to +195°F

general purpose type, fills gap to 0.010”

MB297MED

2,400

transparent

1.09

85

1.48

3.5

20-50

-40 to +250°F

medical grade, Class VI approved, fills gap to 0.008”

MB297MED-1

1,100

transparent

1.06

85

1.48

3.5

20-50

-40 to +250°F

medical grade, Class VI approved, fills gap to 0.007”

MB297MED-2

100

transparent

1.05

85

1.48

3.5

20-50

-40 to +250°F

medical grade, Class VI approved, fills gap to 0.005”

MB297MED-3

5

transparent

1.05

85

1.48

3.5

20-50

-40 to +250°F

medical grade, Class VI approved, fills gap to 0.002”

MB350

100

transparent

1.06

85

1.47

3.6

30-45

-60 to +250°F

low odor, non-blooming, fills gaps to 0.005”

MB356

1,600-1,800

transparent

1.07

85

1.47

3.6

40-60

-60 to +250°F

low odor, non-blooming, fills gaps to 0.007”

*depends on substrates and atmospheric humidity

Master Bond Inc.

Adhesives, Sealants & Coatings • 154 Hobart Street • Hackensack, N.J.  07601 • Tel: 201-343-8983 • Fax: 201-343-2132

Notice:  Master Bond believes the information on the data sheets is reliable and accurate as is technical advice provided by the company.  Master Bond makes no warranties (expressed or implied) regarding the accuracy of the information and assumes no liability regarding the handling and usage of this product.                                                                                                                                                     D219

Table #2: Bonding Characteristics of Master Bond MB Series Cyanoacrylates


TENSILE SHEAR STRENGTH (psi)

At 20°C ±2°C after aging 48 hours.  Test specimens were bonded after
sand blasting followed by wiping of bonding surfaces with acetone.


Bonding Identical Materials

MB300
(Ethyl)

MB302
(Ethyl)

MB297
(Ethyl)

MB325
(Methyl)

MB320
(Methyl)

Plastics

          

ABS-ABS

1,300*

1,300*

1,300*

1,300*

1,300*

Bakelite-Bakelite

1,400*

1,400*

1,400*

1,400*

1,400*

Delrin-Delrin

960

1,060

1,000

640

650

Melamine-Melamine

1,490

1,630

1,560

1,630

1,520

MMA-MMA

2,120

2,140

2,100

2,120

2,100

Nylon-Nylon

920

850

910

780

690

PBT-PBT

1,800

1,840

1,810

1,650

1,620

Phenolic-Phenolic

1,400*

1,400*

1,400*

1,400*

1,400*

Polyacetal- Polyacetal

850*

850*

850*

850*

850*

Polycarbonate-Polycarbonate

1,300*

1,300*

1,300*

1,300*

1,300*

Polyester-Polyester

2,200

2,300

2,210

2,050

2,080

Polystyrene-Polystyrene

600*

600*

600*

600*

600*

PVC (rigid)-PVC (rigid)

2,800*

2,800*

2,800*

2,800*

2,800*

Rubbers

          

Butyl-Butyl

290*

290*

290*

290*

290*

Chloroprene-Chloroprene

540*

540*

540*

540*

540*

Natural Rubber-Natural Rubber

450*

450*

450*

450*

450*

NBR-NBR

560*

560*

560*

560*

560*

Neoprene-Neoprene

580*

580*

580*

580*

580*

Nitrile-Nitrile

550*

550*

550*

550*

550*

SBR-SBR

480*

480*

480*

480*

480*

Metals

          

Aluminum-Aluminum

1,060

1,130

1,110

1,980

1,980

Brass-Brass

2,130

2,550

2,410

2,980

2,960

Chromium- Chromium

1,060

1,350

1,280

1,840

1,910

Copper-Copper

2,410

2,620

2,500

3,400

3,260

Stainless Steel-Stainless Steel

2,340

2,620

2,480

3,050

3,100

Steel-Steel

2,200

2,720

2,440

3,200

3,800

Miscellaneous

          

Glass-Glass

2,700*

2,700*

2,700*

2,700*

2,700*

Porcelain- Porcelain

2,400*

2,400*

2,400*

2,400*

2,400*

Wood (Oak)-Wood (Oak)**

2,100*

2,100*

2,100*

2,100*

2,100*

*Substrate failure—test bond held
**May require accelerator

          

TENSILE SHEAR STRENGTH (psi)

At 20°C ±2°C after aging 48 hours.  Test specimens were bonded after
sand blasting followed by wiping of bonding surfaces with acetone.


Bonding Dissimilar Materials

MB300
(Ethyl)

MB302
(Ethyl)

MB297
(Ethyl)

MB325
(Methyl)

MB320
(Methyl)

Aluminum-Stainless Steel

1,420

1,700

1,670

2,090

2,060

Delrin-Phenolic

730

820

800

680

640

Melamine-Copper

1,700*

1,700*

1,700*

1,700*

1,700*

Melamine-Steel

1,400*

1,400*

1,400*

1,400*

1,400*

NBR-Aluminum

960

1,040

1,020

990

970

Neoprene-Melamine

350

390

380

420

420

Neoprene-Steel

500

560

540

530

520

Nylon-Bakelite

850

990

980

780

780

Nylon-Copper

1,500*

1,500*

1,500*

1,500*

1,500*

Polystyrene-Bakelite

560*

560*

560*

560*

560*

PVC (rigid)-Wood (Oak)**

2,300*

2,300*

2,300*

2,300*

2,300*

Steel-Aluminum

2,270

2,410

2,400

2,410

2,390

Steel-Brass

1,700

2,700

2,540

2,980

2,960

Steel-Butyl

310*

310*

310*

310*

310*

Steel-Chloroprene

350*

350*

350*

350*

350*

Steel-Natural Rubber

340*

340*

340*

340*

340*

Steel-PVC (rigid)

2,200*

2,200*

2,200*

2,200*

2,200*

Steel-Stainless Steel

1,200

1,770

1,740

2,190

2,170

CHEMICAL RESISTANCE

Master Bond cyanoacrylates are not affected by solvents such as gasoline, propane, light oil, alcohol or kerosene.  Alkaline materials, however, may somewhat reduce the bonding strength.

Steel-Steel

psi

psi

psi

psi

pdi

Acetone

1,200

1,560

1,290

2,700

3,760

Kerosene

2,270

2,620

2,410

2,960

3,330

Gasoline

2,200

2,700

2,340

3,200

3,260

10% — HCL

1,700

1,920

210

2,180

2,340

10% — NaOH

110

280

140

140

380

Motor Oil

2,200

2,700

2,270

3,200

3,410

Trichloroethylene

2,270

2,700

2,440

3,100

3,330

Water

2,130

2,410

2,410

3,100

3,120