XtraBond®250 - 100% RTV Acetoxy Silicone Sealant

XtraBond® 250 is a 100% mildew resistant, acetoxy-based high performance silicone designed for many applications. It is formulated as a one component, permanently flexible, silicone and offers excellent adhesion. It is recommended for high moisture areas such as kitchens, baths, and walk-in coolers.


  • Kitchens & Bath Applications
  • Window & Door Applications
  • Glass Replacement
  • Industrial Applications
  • Copper Sheet Metal


  • 100% Anti-Microbial Formula
  • NSF Approved
  • AAMA Approved
  • Excellent Adhesion to Glass
  • Window & Door Approved
  • Non-Sag & Slump
  • 75 Year Durability
  • Quick Curing
  • Excellent UV Resistance
  • Non-Yellowing
  • Consistent Gunablility & Tooling


ASTM C-920, Type S, Grade NS, Class 25, Use NT, G, A, O; TT-S-01543A, Class A; CAN/CGSB-19.13 M87, recognized under UL QMFZ2, MIL-A-6106A, FDA Regulation 21 CFR 177.2600 for incidental food contact, NSF Standard 51 for direct food contact and California Air Resources Board 2003 requirements for Volatile Organic Compound content. Maintains elastomeric properties up to 400°F.

NSF Approved.

Technical Specs

Skin Time 10 minutes
Tack Free Time 20 minutes
Cure Rate 1/4 " Bead / 24 Hours
VOC 3.27 %
Elongation @ Break 550%
Hardness (shore A) 25 +/- 5
Movement Capability +/- 25%
Peel Strength 19 psi
Bond Durability on Glass/Vinyl/Alumimum 25%
Tensile Strength 255 psi
Staining None
UV Resistance Excellent
Application Temperature -31 deg. F to 149 deg. F
Temperature Resistance -76 deg. F to 401 deg. F after curing



This product is available in the following colors:

  • Almond
  • Aluminum Stone
  • Beige
  • Black
  • Bronze
  • Clear
  • Desert Tan
  • Translucen
  • White


The XB250 is available for the following industries


This product is available in the following configurations:

  • 10.1 oz cartridges: Twist-On Nozzles
  • 4.5 gal in a 5 gal pail
  • 52 gal in a 55 gallon drum
  • Other packaging is available upon request.

Limited Lifetime Warranty

This product is guaranteed to give satisfactory performance if applied in accordance with the label directions. Liability to Premier Industrial Supply, Inc. (Premier) is limited to a full refund of the purchase price or product replacement if product is proven defective. Premier shall not be liable for loss or damage, whether direct, consequential or incidental. There are no other warranties expressed or implied including the implied warranty of merchantability or fitness for a particular purpose.