3M 921XL

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Description for 3M 921XL

Tape has a liner that extends beyond the width of the adhesive to provide easy liner starting and removal.

Chemical Resistance	Chemical Resistance: Low
Application Type	Bond, Mounting, joining
1 Part or 2 Part	1-Part
Material Form	Extended Liner Tapes
Substrate	Steel
Manufacturer	3M
Chemistry	Acrylic
Cure Method	Pressure Sensitive
Application Temperature (°F)	70 to 100
Color	Clear
High Temperature Resistance (°C)	65, 93

Best Practices for 3M 921XL

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Technical Data for 3M 921XL

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Overview

Chemical Resistance
- Chemical Resistance : Relative Solvent Resistance - Low
Application Type
- Adhesive - Bond, Mounting, joining
1 Part or 2 Part
- 1-Part
Material Form
- Tape - Extended Liner Tapes
Substrate
- Steel
Industry
- Industrial
- Other - ideal for mounting and joining materials where repositionability may be desired.
Chemistry
- Acrylic
Cure Method
- Pressure Sensitive (min) - Pressure Sensitive
Color
- Clear / Transparent - Clear

Specifications

Cure Specs

Application Temperature (°F)	70 to 100

Bond Strength

General Bond Strength (psi)	20 (oz./in.)	Test Method

Material Resistance

UV Resistance	Excellent
High Temperature Resistance (°C)	65, 93

Business Information

Shelf Life Details	18 (months) from date of manufacture when stored in original cartons at 70°F (21°C) and 50% relative humidity.
Shelf Life Temperature (°F)	70
Shelf Life Type	From date of manufacture
Shelf Life (mon)	18

Best Practices for 3M 921XL

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1. Surface Preparation
  
  To obtain optimum adhesion, the bonding surfaces must be clean, dry, and well unified. Some typical surface cleaning solvents are isopropyl alcohol and heptane.
  
  Note: Be sure to follow manufacturer’s safety precautions and directions for use when using solvents.
2. 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.
  
  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.
Comparable Materials for 3M 921XL

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Spec Engine^® Results
- VHB Tape 4646(3M)
  • Dark gray • Interior bonding applications • Exterior bonding applications • Replace spot welds • Excellent solvent resistance. • Replace liquid adhesives • Replace rivets • High temperature resistance • UL 746C • Excellent durability.
- 4932(3M)
  White, closed-cell acrylic foam carrier • Good adhesion to polypropylene and many powder paints• Apply as low as 50°F (10°C)
- 4714(3M)
  Adhere to a variety of substrates, including latex-painted wood, lacquered wood, enameled steel, glass, aluminum, stainless steel, acrylic, ABS, and PVC (non-plasticized) as tape adhesion is typically satisfactory within 20 minutes and continues to build with additional time.
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