SIKASIL HT

What is SIKASIL HT and why choose it

SIKASIL HT by Sika is a neutral (oxime-type) silicone sealant that cures with ambient humidity and offers high resistance to continuous high temperatures up to 325ºC, and occasionally up to 350ºC. Its thixotropic consistency prevents sagging on vertical and overhead joints, while its neutral curing system ensures low odour and good adhesion on most common construction materials without primer. Supplied ready to use in a 300 ml cartridge, it is ideal for sealing elements exposed to high temperatures such as barbecues, chimneys and stoves.

Main features

• Neutral cure silicone (oxime type): cures by reaction with ambient humidity.
• High temperature resistance: continuous service up to 325ºC and occasional peaks up to 350ºC.
• Thixotropic consistency: non-sagging, suitable for vertical and overhead applications.
• Ready to use: supplied pre-packed; no mixing required.
• Good adhesion without primer: adheres to most construction materials including concrete, aluminium, glass and PVC.
• Low odour: neutral curing system, free of strong smells during application and curing.
• Weather and UV resistance: suitable for exterior applications exposed to atmospheric agents and sunlight.
• Elastic performance: accommodates movements up to 25%.
• Fast skin formation and curing: skin in approximately 10 minutes and curing rate of 2 mm per 24 hours (23ºC / 50% RH).

Technical specifications

• Product name: SIKASIL HT
• Chemical base: neutral silicone sealant (oxime type), moisture curing
• Colour: grey
• Density: 1.95 kg/l
• Shore D hardness: ~50 (after 7 days at 23ºC / 50% RH)
• Shore A hardness (ISO 868): ~20 (after 28 days at 23ºC / 50% RH)
• Tensile strength (DIN 53515): ~1.08 N/mm² (23ºC / 50% RH)
• Modulus of elasticity (DIN EN ISO 8340): ~0.45 N/mm² at 100% elongation (23ºC / 50% RH)
• Elongation at break (DIN 53504): ~375% (23ºC / 50% RH)
• Maximum movement capability: 25%
• Skin formation time: ~10 minutes (23ºC / 50% RH)
• Curing rate: 2 mm / 24 h (23ºC / 50% RH)
• Temperature resistance: continuous up to 325ºC, occasionally up to 350ºC
• Storage / shelf life: 1 year from date of manufacture
• Packaging: 300 ml cartridge

Applications and use cases

SIKASIL HT is designed for sealing a wide range of materials used in construction and PVC joinery, particularly where continuous high temperature resistance is required. Typical use cases include:

• Sealing joints and gaps in barbecues.
• Sealing around chimneys and flue connections.
• High-temperature joints in stoves and heaters.
• Sealing elements in forged or cast iron cookers.
• General sealing of compatible construction materials exposed to high heat and outdoor weathering.

Substrates

• Most common construction materials such as concrete.
• Aluminium.
• Glass.
• PVC.

On glass and aluminium, the best results are obtained without primer. For very porous substrates or applications subjected to high stresses, it is recommended to evaluate adhesion and consult the technical department. Primers, where used, act only as adhesion promoters and do not replace proper surface cleaning.

Application method (summary)

• Use only closed-cell foam backer rods compatible with the sealant, such as cross-linked polyethylene profiles.
• Ensure the substrate is clean, dry, homogeneous, and free from grease, dust, paint, laitance and loose particles.
• Apply the sealant with a suitable sealant gun directly from the cartridge.
• Fill the joint completely, avoiding air entrapment.
• Tool and smooth the surface with a spatula or suitable liquid, pressing the sealant firmly against the joint edges.

Section 14 – Transport information

Consultar ficha técnica del fabricante.

Section 8 – Individual protection measures

Consultar ficha técnica del fabricante.

FAQ

What type of sealant is SIKASIL HT?

SIKASIL HT is a neutral-curing silicone sealant (oxime type) that cures by reaction with ambient humidity.

What colour is SIKASIL HT?

The sealant is supplied in grey.

Up to what temperature can SIKASIL HT resist?

It resists continuous temperatures up to 325ºC and occasional peaks up to 350ºC.

Does SIKASIL HT require a primer?

For most construction materials, including concrete, aluminium, glass and PVC, a primer is not necessary. On glass and aluminium, the best results are obtained without primer.

What is the movement capability of SIKASIL HT?

The maximum accommodated movement is 25%.

How long does SIKASIL HT take to cure?

Skin forms in approximately 10 minutes at 23ºC and 50% RH, with a curing rate of about 2 mm per 24 hours under the same conditions.

In what packaging is SIKASIL HT supplied?

It is supplied in 300 ml cartridges.

What is the shelf life of SIKASIL HT?

The shelf life is 1 year from the date of manufacture, under appropriate storage conditions.

Where can SIKASIL HT be used?

It is intended for sealing construction materials and PVC joinery exposed to high temperatures, such as barbecues, chimneys, stoves and forged cookers.

Is SIKASIL HT suitable for exterior applications?

Yes, it has good resistance to atmospheric agents and UV radiation, making it suitable for outdoor use.

*Contenido generado por IA