Ceresit CT240 WINTER - render and paint accelerator
What is Ceresit CT 240?
Ceresit CT 240 is a specialized Winter Additive designed to accelerate the drying and curing process of silicone, acrylic, and silicate-silicone renders in cold and humid conditions. It allows for safe rendering at temperatures as low as 0°C and ensures rain resistance is achieved significantly faster, extending the UK rendering season through the winter months.
| Technical Specification | Value / Detail |
|---|---|
| Compatible Renders | CT 60, CT 74, CT 75, CT 76, CT 174, CT 175 |
| Minimum Application Temp | 0°C (with additive) |
| Dosage Rate | One 100ml bottle per 25kg tub of render |
| Key Benefit | Accelerated resistance to rain and frost |
| Material Base | Specialized accelerator blend |
| Usage | Added directly to the render tub before mixing |
- How do I use Ceresit CT 240 Winter Additive?
Simply pour the entire contents of the 100ml bottle into a 25kg tub of Ceresit render and mix thoroughly with a low-speed drill. The additive does not change the color or texture of the render; it only speeds up the chemical setting process. - What is the minimum temperature for rendering with CT 240?
With CT 240, you can apply render in temperatures ranging from 0°C to +15°C. It is especially effective in high-humidity conditions (up to 95%) where standard renders would stay wet for days and potentially wash off in the rain. - Does CT 240 prevent render from freezing?
No. CT 240 is an accelerator, not an anti-freeze. Its purpose is to help the render reach a rain-resistant and frost-resistant state (approx. 6–8 hours) before the nighttime temperatures drop below freezing. You must still ensure the wall is not frozen during application.
- Check the Forecast: Ensure the temperature will remain above 0°C for at least 6–8 hours after application.
- Add to Tub: Open the Ceresit CT 240 bottle and pour it into your 25kg bucket of Silicone Render.
- Mix: Use a low-speed mixer for 2 minutes to ensure the additive is evenly distributed.
- Apply Immediately: The "pot life" (working time) is slightly reduced when using an additive, so apply the render promptly.
- Protect: Even with the additive, use scaffolding nets to protect the fresh render from direct frost or heavy downpours during the first few hours.
- Pro-Tip on Color Consistency: If you use CT 240 on one wall, you should use it on all walls of the same elevation to ensure the drying rate is consistent, which helps prevent minor shade variations in the final finish.
- Pro-Tip for Builders: CT 240 is a "must-have" for UK contractors from November to March. It drastically reduces the risk of "wash-offs," saving thousands of pounds in labor and material replacement costs.
CERESIT® CT 240 is an additive to thin-coat acrylic plasters, silicone-silicate plasters, silicone plasters and priming paints and acrylic paints, silicone paints. It accelerates binding and drying of CERESIT plasters and paints in conditions of low temperature and high air humidity. The additive enables conducting works in the late autumn and early spring periods, when the temperature at night drops below zero. Available pack size: plastic container 100 ml