3M 4921

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Description for 3M 4921

Translucent, closed-cell elastomeric foam carrier • Thin bond line

Application Type	Bond, Hold
1 Part or 2 Part	1 Part
Material Form	Tape, Elastomeric Foam
Substrate	Metal, Elastomers, Wood, Plastics
Manufacturer	3M
Chemistry	Elastomeric Foam, Acrylic
Cure Method	Pressure Sensitive
Color	Natural
Relative Solvent Resistance	Chemical Resistance: Hydrocarbon solvent
High Temperature Resistance (°C)	66, 93
Density (g/cm³)	0.510
Key Specifications	TSCA

Best Practices for 3M 4921

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Surface Preparation

To obtain optimum adhesion, the bonding surfaces must be clean, dry and well unified. Typical surface cleaning solvents are isopropyl alcohol and water (rubbing alcohol) or heptane. Note: Be sure to follow manufacturer’s safety precautions and directions for use when using solvents. These cleaning recommendations may not be compliant with the rules of certain Air Quality Management Districts in California

consult applicable rules before use.
Application

Bond strength is dependent upon the amount of adhesive-to-surface contact developed. Firm application pressure helps develop better adhesive contact and improve bond strength.

Ideal tape application temperature range is 70°F to 100°F (21°C to 38°C). Initial tape application to surfaces at temperatures below 50°F (10°C) is not recommended because the adhesive becomes too firm to adhere readily. However, once properly applied, low temperature holding is generally satisfactory.

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Technical Data

Overview

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Specifications

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Best Practices

*See Terms of Use Below
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Comparable Materials

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Shear Strength Test Methods

Shear Strength	Type	Test Temperature	Test Method
1000 (gram)	Static shear strength	22°C	Measured at various temperature & gram loadings. (1/2 sq. in.overlap). Will hold listed weight for 100 hrs.
1000 (gram)	Static shear strength	49°C	Measured at various temperature & gram loadings. (1/2 sq. in.overlap). Will hold listed weight for 100 hrs.
500 (gram)	Static shear strength	66°C	Measured at various temperature & gram loadings. (1/2 sq. in.overlap). Will hold listed weight for 100 hrs.

Tensile Strength Test Methods

Tensile Strength	Test Method
95 psi	(“T” Block) 1 in.2 (6.45 cm2) Jaw Speed 2 in/min (50 mm/min)
600 psi

3M 4921

Description for 3M 4921

Best Practices for 3M 4921

Surface Preparation