C-Tec CT1 is the professional's one-part TRIBRID® polymer sealant and construction adhesive — the unique British-made chemistry that bonds, seals, fixes and repairs across virtually every construction substrate. This listing covers the darker-tone variants most in demand for roofing, structural and industrial work: Grey (535306), Anthracite (535307) and Black (535106), each supplied in a 290 ml recyclable cartridge.
CT1's TRIBRID® Technology delivers up to 360% greater strength and 250% more elongation than a traditional hybrid polymer, with a solid non-porous cure that will not shrink, crack or stain. It works in wet or dry conditions — even under water, is completely odourless with no solvents and no isocyanates, and is certified EC1 Plus A+ Indoor Air Comfort GOLD® and ISEGA (safe for food-preparation contact).
2.90 N/mm²
Tensile Strength
-40 to +120°C
Thermal Range
Good to Know
The Grey, Anthracite and Black colours are the professionals' choice for large-scale infrastructure, roofing, glazing bead-work, lead flashings, industrial jointing and structural fabrication — where the finished bead sits against dark or exposed substrates and colour retention against UV is critical.
Substrate Compatibility
Bonds virtually every substrate — all metals (including lead), glass, mirrors, all woods, MDF, polystyrene, fibreglass, tiles, concrete, most stones (without staining) and most synthetic materials. It does not bond to polypropylene (PP), polyethylene (PE) or PTFE. For mirror bonding, apply in vertical strips (not suitable for PP-backed mirrors).
Key Features
TRIBRID® Technology
C-Tec's proprietary tri-polymer chemistry fuses three polymer types into a solid, void-free cure — producing a sealant that is 360% stronger than a traditional hybrid polymer with 250% greater elongation.
Excellent UV & Colour Retention
Formulated for colour stability under prolonged UV exposure — especially important on Anthracite and Black beads used on external glazing, roofing and lead-work where sun-driven bleaching would be visible.
Works Wet, Dry & Under Water
Skins, cures and bonds on wet surfaces, in the rain and under water, including salt-water environments. Ideal for emergency roof, gutter, pond, marine and boat-hull repairs.
Non-Porous, Anti-Microbial Cure
The cured surface is non-porous, so bacteria and microbes cannot penetrate the bead — reducing mould and fungal growth. Combined with ISEGA certification, this makes CT1 safe for kitchen, sanitary and food-processing environments.
Wide Service Temperature
Continuous service from -40 °C to +120 °C once cured, with frost resistance in transport down to -15 °C — suited to cold-store, external roof and industrial process locations.
Replaces Multiple Products
One tube replaces wood and P.U. adhesives, silicone sealants, sanitary silicones, acrylic sealants and butyl rubbers. In most applications, the bond holds without any additional mechanical fixings — cutting labour time significantly.
Technical Specification
Product Identity
Product Type
One-part TRIBRID® polymer sealant & construction adhesive
Manufacturer
C-Tec N.I. Limited (Newry, Northern Ireland)
Available Colours (this listing)
Grey, Anthracite, Black
Cure & Application
Application Temperature
+5 °C to +40 °C
Skin Cure Time
25 minutes ±5 min (23 °C, 50% RH)
Full Cure — 2–3 mm bead
12 hours (23 °C, 50% RH)
Full Cure — 3–6 mm bead
12–48 hours
Full Cure — 6–12 mm bead
48–72 hours
Volume Shrinkage After Cure
< 3%
Mechanical Performance
Tensile Strength (DIN 53504-S1A)
2.90 N/mm²
Substrate Bonding — Tensile Force
3.07 N/mm² = 31.3 kg/cm² (BS EN ISO 8339:2005)
Elongation at Rupture
385%
Hardness (DIN 53505)
55° Shore A
E-Modulus 100% (DIN 53504-S1A)
1.15 N/mm²
Density (ISO 1183-1)
1.58 kg/L
Service & Environmental Performance
Thermal Stability (cured)
-40 °C to +120 °C
Frost Resistance in Transport
Up to -15 °C
Chemical Resistance — Good
Water, seawater, aliphatic solvents, oils, greases, diluted organic acids
Chemical Resistance — Moderate
Esters, ketones, aromatics, chlorinated solvents, swimming-pool chlorine
Chemical Resistance — Limitations
Strong acids and alkalis
Dirt Attachment
Practically none
Certifications & Safety
Test Standard
BS EN ISO 8339:2005 (Tensile properties — Extension at break)
Indoor Air Quality
EC1 Plus certified — Indoor Air Comfort GOLD®
Food Contact
ISEGA certified (conforms to food-preparation standards)
Facade / Building Envelope
ETAG 022
Allergy Approval
Approved by NAAF (Norwegian Asthma & Allergy Association)
Solvent / Isocyanate Content
None — non-toxic, odourless
Cartridge Recycled Content
80% PCR (post-consumer recycled) packaging
Storage & Packaging
Cartridge Format
290 ml recyclable cartridge
Storage
Store at room temperature; keep cartridges upright
Shelf Life
18 months from date of manufacture (unopened)
Colour Variants
Variant
Manufacturer MPN
EAN / Barcode
Typical Application
CT1 Grey
535306
8711595081658
Concrete-to-concrete joints, render, block-work, industrial & commercial jointing where a mid-grey bead is required
CT1 Anthracite
535307
5060209630502
Anthracite-grey window frames, dark cladding joints, roofing details and lead-work where a dark charcoal bead is preferred
CT1 Black
535106 (CT1535106)
5060209632094
Roofing, lead flashings, glazing beads on dark-framed windows, automotive and marine repairs
Frequently Asked Questions
What is the difference between CT1 Grey and CT1 Anthracite?
Both cure to a matt, non-porous finish, but the shade is very different. CT1 Grey (535306) is a mid, neutral light-grey typical of concrete and mortar joints. CT1 Anthracite (535307) is a much darker charcoal-grey, matching modern anthracite window and door frames (e.g. RAL 7016 — note this is a close visual match, not an exact RAL specification).
Can CT1 be used on lead flashings and roof-work?
Yes — CT1 bonds to all metals, including lead, and is regularly used to lap-seal lead flashings, gutter joints, roof valleys and slate/tile repairs. It is UV-resistant, cures under water and remains flexible under thermal cycling, so it copes well with a working roof.
Is the darker colour the same TRIBRID® formulation as the standard CT1?
Yes. The Grey, Anthracite and Black variants share the same TRIBRID® base chemistry, tensile strength (2.90 N/mm²) and elongation (385%) as the rest of the coloured range (excluding Silver, which is a slightly different modulus). The pigment package changes; the mechanical performance does not.
Will CT1 stain natural stone or masonry?
CT1 is formulated to not bleed through or stain most natural stones, unlike many silicone-based sealants. For sensitive porous stones (marble, limestone, some sandstones) or on show-face architectural work, C-Tec recommends a small patch test in an inconspicuous area first.
How is CT1 supplied and what is the shelf life?
CT1 is supplied in a 290 ml recyclable cartridge for use in any standard mastic gun. Unopened cartridges have an 18-month shelf life from the date of manufacture when kept in cool, dry conditions. The cartridge itself is manufactured with 80% post-consumer recycled plastic.
What are the certifications and is it safe for indoor use?
CT1 is EC1 Plus certified — Indoor Air Comfort GOLD® (very low VOC), ISEGA certified for food-preparation contact, tested to ETAG 022 for building-envelope use, and approved by NAAF, the Norwegian Asthma and Allergy Association. It contains no solvents and no isocyanates and is completely odourless in use.
