Sika

FireStop (UK)

One-part intumescent firestop sealant · GB · manufacturer-sourced

Check your container: This countdown is for the One-part intumescent firestop sealant variant. Similar-looking versions may have different times.

How long does Sika FireStop (UK) take to dry?

Short answer

Tack-free: 5 minutes after application.
Full cure: 7 days after application.
Firestop sealants

Firestop cure plan

A skin is not a cure, and depth sets the pace

  1. Install the One-part intumescent firestop sealant to the tested system
  2. Leave it undisturbed through the skin stage
  3. Wait for full cure before painting or inspection

This product’s stated stages Quoted at 73°F and 50% humidity

  • Tack-free5 minutes
  • Full cure7 days

Worth noticing: Tack-free at 5 minutes; full cure at 7 days.

Common mistake: Painting or covering a firestop that has skinned but not cured through.

Firestop sealants

Bond-strength path

Assembly, handling and full load are different stages

1 · AssembleClean, fit and apply the One-part intumescent firestop sealant version correctly.
2 · HoldKeep the joint undisturbed through its set or clamp stage.
3 · LoadUse full cure—not surface firmness—before demanding use.

Time the firestop cure

When was the sealant installed?
Conditions that affect drying
Where?
Thickness

Stated times

  • Tack-free5 minutes
  • Full cure7 days

From Sika data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.

Manufacturer website: usa.sika.com

Conditions & fine print
  • Stated conditions: 73°F (23°C) and 50% relative humidity
  • Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet.
  • Temperature range: 41°F to 86°F
  • Region GB. Formulas can differ between countries; check your container.
  • Tack-free: At +23°C and 50% relative humidity.
  • Full cure: The cure rate is about 2 mm per 24 hours.
  • Entered from the cited manufacturer documentation. Check the current label for the exact formula and region. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Confirm this is your product

Closely named formulas, colors and regional versions can use different times. Match these details to your container before starting a countdown.

Exact listing
Sika FireStop (UK)
Variant
One-part intumescent firestop sealant
Region
GB
Listed use
firestop sealing, gun-applied intumescent joints
Timed stages recorded
tack free, full cure
Source checked
2026-10-25

Documentation: Technical data sheet · Edition 18/09/2006, identification no. 02 05 01 11 001 0 000001

Condition attached to the stated time: At +23°C and 50% relative humidity.

About this product

A 2006 UK edition for a one-part, gun-applied intumescent sealant. It skins in under 5 minutes but cures at about 2 mm a day, reaching a Shore D hardness near 50 at 7 days. The sheet says to remove masking tape while the sealant is still soft.

Using this specific product

Sika FireStop (UK) is listed here as the One-part intumescent firestop sealant version for firestop sealing and gun-applied intumescent joints. For sealing a firestop opening, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.

Before you start

  • Confirm the package says One-part intumescent firestop sealant; related versions can use different timing.
  • For firestop sealing and gun-applied intumescent joints, pay particular attention to temperature, joint depth, humidity and the thickness of the bead.
  • At +23°C and 50% relative humidity. The cure rate is about 2 mm per 24 hours.

How to check readiness

Confirm the sealant is tack-free and cured to depth before the opening is inspected or the area is closed up. The data sheet lists a skinning time of under 5 minutes. Reserve full cure for demanding use, chemicals, washing, immersion or load—not merely gentle handling.

Avoid this mistake

Tack-free is only the surface; the rated seal depends on the full depth cure shown on the sheet.

Compare with similar products

Keep going

Questions

How long does this product take to dry?

Sika states: The data sheet lists a skinning time of under 5 minutes. Conditions: At +23°C and 50% relative humidity.. The data sheet gives a Shore D hardness of about 50 after 7 days. Conditions: The cure rate is about 2 mm per 24 hours.. These are the manufacturer’s stated times, not a guarantee.

Why does the Sika FireStop sheet say to pull masking tape early?

Because the sealant skins in under 5 minutes. The sheet says to remove the tape while the sealant is still soft and then tool it for a smooth finish.

How long does this product take to fully cure?

Sika states: The data sheet gives a Shore D hardness of about 50 after 7 days. Conditions: The cure rate is about 2 mm per 24 hours.. These are the manufacturer’s stated times, not a guarantee.

What affects how long this product takes to dry or cure?

Firestop sealant must be installed to the tested system and inspected. Cure advances from the surface inward, so depth matters. Follow the current data sheet. Follow the product label for your conditions.

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