Sika Extender T
An inert, fibrous polymer powder that lets applicators dial in the viscosity of Sikafloor epoxy, polyurethane and PMMA resins on site, without touching pot life or cure.
What is it?
A fine, white, fibrous polymer powder that acts as an inert thickening agent for Sikafloor resin flooring systems.
Where is it used?
On resin floor projects where the applied Sikafloor epoxy, PU or PMMA mix needs to be made more viscous, thixotropic or texturable on site.
Why use it?
It raises viscosity at a low addition rate without affecting pot life or cure rate, giving crews control over texture, vertical hold and pore filling.
How is it applied?
Weigh in the dose called for by the specific Sikafloor resin data sheet, add gradually over roughly 30 seconds and mechanically mix until fully dispersed with no lumps.
About Sika Extender T
Sika Extender T is one of those quiet, workhorse products that rarely gets specified by name but shapes how a resin floor actually turns out on site. It is an inert, fine, white, fibrous polymer powder whose single job is to thicken Sikafloor epoxy, polyurethane and PMMA resins so the crew can control how the material behaves once it leaves the mixing bucket. Because it is chemically inert and non-reactive, it changes the flow and body of a resin without interfering with the curing chemistry, which means pot life and cure rate stay exactly as the base system’s data sheet predicts. For applicators, that predictability is the whole point: viscosity becomes an adjustable variable rather than a fixed property of the resin you happened to open.
In practice, Space Arc supplies Extender T to flooring contractors who need a resin to do something its neat form will not, such as hold on a wall without slumping, carry an orange-peel or anti-skid texture, or fill hairline cracks and surface porosity during preparation. It is not a standalone product; it is always used in combination with a Sikafloor resin, and the correct dose is read off that resin’s own data sheet rather than guessed. Sold in 1 kg containers, it is easy to store, easy to meter and economical relative to the amount of resin it modifies, since only a low addition rate is needed to make a meaningful change in viscosity.
The technical insight
The mechanism is physical rather than chemical, and that distinction is what makes Extender T useful. The powder is a mass of fine polymer fibres. When it is dispersed into a liquid resin, those fibres build a loose internal network that resists flow while the material is at rest but breaks down under the shear of trowelling or rolling. That is classic thixotropic behaviour: the mix thickens and holds shape on a vertical face or as a texture, then flows again when it is worked. Because the fibres are inert, they contribute no reactive groups to the epoxy or urethane crosslinking process, so the amine or isocyanate stoichiometry of the base system is untouched and cure proceeds normally. The trade-off is purely about loading. A small addition changes body without changing appearance; push the addition rate high and the fibre network becomes dense enough to scatter light and, in some clear resins, to become faintly visible, while very heavy loading can start to interfere with how the resin wets and bonds to the substrate. The skill, therefore, is adding the least powder that achieves the required consistency, which is why Sika ties the dose to each resin’s data sheet rather than publishing one blanket figure.
Where it is used
- Adjusting the viscosity of Sikafloor epoxy, polyurethane and PMMA resins to suit site temperature and working conditions
- Holding resin in place on vertical surfaces such as coving, skirting and detailing so it cures without slumping
- Creating custom orange-peel and anti-skid textures on ramps, walkways and process floors
- Filling and sealing hairline cracks and surface pores during floor preparation on horizontal and vertical surfaces
- Producing a thin-set, fine-textured finish where a neat self-levelling resin would be too fluid
- Thickening clear and pigmented resin coats where a heavier, more controllable body is needed for application
Key advantages
- Raises resin viscosity at a low addition rate, so a small quantity modifies a large volume of resin economically
- Has no effect on pot life or cure rate, keeping the base system’s working time and set predictable
- Chemically inert, non-reactive and non-carcinogenic, so it introduces no new curing variables or reactivity
- Gives applicators on-site control over texture, vertical hold and flow to suit real conditions
- Easy to mix and disperse mechanically, with full dispersion reached in roughly 30 seconds of mixing
- Compatible across the Sikafloor epoxy, polyurethane and PMMA families rather than being tied to one resin
- Convenient 1 kg pack that is simple to meter accurately and store on site
- Two-year shelf life in sealed packaging, giving flexibility across long project timelines
Limitations & considerations
- Not a standalone product; it only works in combination with a Sikafloor resin and cannot be used on its own
- Dosage is not fixed by Extender T itself and must be read from each Sikafloor resin’s own data sheet
- At high addition rates gloss finish can be dulled and adhesion characteristics can be affected
- In some clear resins the powder may become faintly visible when heavily loaded
- Must be mechanically mixed; hand mixing will not disperse the fibres properly
- Highly moisture sensitive and must be kept dry, so opened or damaged packaging risks caking and loss of performance
Selection & best practice
Always take the addition rate from the specific Sikafloor resin data sheet you are working with rather than a generic figure, and start on the low side, adding more only if the consistency is still too fluid. Add the powder gradually into the mixed resin over roughly 30 seconds and mechanically mix, scraping the sides and bottom of the container, until the paste is homogeneous with no visible lumps; never hand mix. Because gloss, adhesion and visibility in clear coats all degrade at heavy loadings, treat the minimum dose that achieves the required body as the target. Keep containers sealed and dry between +5 C and +25 C, use opened packs promptly, and always run a trial mix on the actual resin and batch before committing to a large pour so the crew can confirm texture, flow and finish.
Specifications
| Product type | Inert fibrous polymer thickening agent for resin flooring |
| Compatible systems | Sikafloor epoxy, polyurethane (PU) and PMMA resins |
| Appearance / colour | Fine, white, fibrous powder |
| Chemical nature | Inert, non-reactive, non-carcinogenic polymer |
| Effect on cure | No effect on pot life or cure rate |
| Recommended dosage | Per the individual Sikafloor resin Product Data Sheet (system-dependent) |
| Mixing | Mechanical only; add over ~30 seconds until fully dispersed, no lumps |
| Packaging | 1 kg container |
| Shelf life / storage | 2 years in sealed, dry packaging at +5 C to +25 C |
Industry use cases
Industrial and warehouse flooring
Contractors use it to add a controlled anti-skid texture to epoxy and PU floors in production areas, ramps and loading zones without changing the resin’s cure schedule.
Pharma, food and cleanroom floors
Helps build seamless coving and vertical skirting in Sikafloor systems so the resin holds on upstands and internal corners while curing hygienically.
Commercial and showroom resin floors
Lets applicators fine-tune viscosity for a consistent, defect-free finish across large decorative and self-smoothing floor areas.
Repair and floor preparation
Thickens resin into a workable paste for filling hairline cracks and surface porosity before the main coat goes down.
Multi-level and sloped surfaces
Used on car park decks, ramps and inclined process floors where the mix must resist slumping and set with the intended texture.
Frequently asked questions
What exactly does Sika Extender T do?
How much Extender T should I add to the resin?
Will it change how the resin cures or how long I have to work it?
Can I mix it in by hand?
Are there downsides to adding a lot of it?
How is it packed and stored?
How we position Sika Extender T
Sika Extender T is a companion product, not a finished floor, so it is best positioned alongside the Sikafloor resins it modifies. Within the Sika family, pair it with Sikafloor epoxy, polyurethane and PMMA flooring systems and their associated primers and sealers, since the correct dose and the finished performance both depend on the base resin chosen. Space Arc customers building complete floor packages typically specify it together with a Sikafloor primer, the main resin coat and, where a broadcast finish is wanted, quartz aggregate rather than fibre thickening. Across our wider portfolio, the equivalent intent in other brands sits inside pre-formulated thixotropic mortars and screeds (for example Fosroc’s Nitomortar and Nitoflor range, or MC-Bauchemie and Master Builders Solutions resin systems) rather than a separate additive powder, so where a client wants thixotropy built into the product we would point them to those complete systems instead. For consultants standardising on Sika, Extender T is the on-site tool that keeps a single resin flexible across textured, vertical and pore-filling situations without adding a second product to the specification.
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