CRL Anodized Aluminum Tremco® Spectrem® 2 High Performance Silicone Sealant

• High performance silicone sealant for structural glazing and curtain wall joints
• Tools easily, neutral cure—cures quickly without corrosive by-products

Tremco® Spectrem® 2 Silicone Sealant (SKU: 947878) is a medium‑modulus, one‑part, neutral cure silicone sealant formulated for demanding caulking and glazing applications where durability, UV resistance, and long-term weather sealing are required.


Basic Uses
CRL Tremco® Spectrem® 2 is suitable for caulking and glazing applications including cap beads, toe beads, heel beads, tensile beads, and other typical air and weather seals. Designed for two‑sided structural glazing systems and curtain/window wall joints, it performs as a weather seal and tensile sealant in building envelope installations.

Key Differentiators

• Neutral cure chemistry—safe on metals and sensitive substrates
• Medium modulus—balances movement accommodation with structural performance
• Formulated for long-term UV, ozone, and weather resistance in exterior façades

Comparable Sealants
CRL: 95C. Dow Corning®: 795, 995, 791. GE®: SilPruf® 2000, UltraGlaze® SSG 4000. Tremco®: Spectrem® 3. Pecora: 864, 895. Sonneborn: OmniSeal. Sika®: SikaSil®-WS95.

Limitations & Installation Notes
All structural glazing applications must be reviewed and approved by Tremco® Technical Service prior to use. Do not apply to damp or contaminated surfaces. Follow cartridge label and the Specification Data Sheet for substrate preparation, primer recommendations, and joint design limits.

Technical Data & Standards
Meets or exceeds TT-S-001543A (COM‑NBS) Class A; TT-S-00230C (COM‑NBS) Class A, Type II; ASTM C‑920 Type S, Grade NS, Class 50, Use NT, M, G, A, O; CAN/CGSB‑19.13‑M87; AAMA 802.3‑92 (Type I & II), 805.2‑94 (Grade C), and 808.3‑92.


Product Warning:

All structural glazing applications must be reviewed and approved by Tremco® Technical Service prior to the application of Spectrem® 2. Do not apply to damp or contaminated surfaces. Check cartridge label and Specification Data Sheet for additional limitations.