Product Description
Calcium Chloride Render Accelerator is a technical grade additive (77%-80 purity) designed to dramatically improve the performance of cement based renders. Supplied in a 25kg bag of flakes, this accelerator is ideal for professional use in concrete, mortar, screeds, and rendering applications.
When added to your render mix, calcium chloride render accelerator alters the rate of hydration, reducing setting time by up to two thirds for example, from 6 hours to just 2 hours. This makes it especially valuable in cold climates, where traditional mixes may struggle to cure before frost damage occurs.
The flakes dissolve quickly in warm water and integrate seamlessly into your mix, improving workability, adhesion, and early strength development without compromising the final finish.
Benefits of Calcium Chloride Flakes in Rendering:
- Accelerated curing, reduces setting time by up to 66%
- Cold weather performance, enables rendering in winter conditions
- Improved adhesion, stronger bond to substrates, reducing cracking
- Enhanced workability, easier to apply and shape
- Versatile use, suitable for concrete, mortar, screeds, and render
- Cost efficient, saves time and labour on site
Typical Applications of cement render accelerator
- External wall rendering in cold or damp conditions
- Cement-based render systems requiring fast curing
- Projects with tight deadlines or limited working windows
- Applications near freeze-prone environments
- Enhancing adhesion on aged or porous surfaces
Calcium Chloride Render Accelerator is designed to enhance the performance of cement based renders. Supplied in flake form, it is easy to dissolve and mix, making it a preferred choice for professionals working in cooler climates or on time-sensitive projects
In addition to speeding up curing, calcium chloride improves early strength development, which helps reduce shrinkage and cracking. It also enhances adhesion to substrates, making it ideal for rendering over older or porous surfaces. The improved workability makes the mix easier to apply and finish, especially in vertical or overhead applications.
Usage Guide: Calcium Chloride Render Accelerator (Flakes)
Recommended Dosage
Use at 2% by weight of cement in your mix.
Example: For 50kg of cement, add 1kg of calcium chloride flakes.
This dosage is given as a guide only based on the dihydrate form of calcium chloride.
Mixing Instructions
Measure the required amount of flakes based on your cement quantity.
Dissolve flakes in warm water before adding to the mix.
This ensures even distribution and prevents clumping.
Add the dissolved solution to your render, mortar, or concrete mix.
Mix thoroughly to ensure uniform acceleration and performance.
Application Conditions
Ideal for use in cold weather or damp environments.
Suitable for:
External wall rendering
Cement-based mortars
Screeds and concrete mixes
Please note this information is provided as a guide only
Q: What is a render accelerator and why use calcium chloride flakes?
A: A render accelerator is an additive that speeds up the setting and curing time of mortar or render mixes, especially in cold or damp weather. Calcium chloride flakes work by accelerating the hydration of cement, helping your render harden faster and reducing the risk of frost damage or wash-out.
Q: How much calcium chloride flake should I add to my render mix?
A: The typical recommended dosage is 1–2% by weight of the cement content, though you should always follow manufacturer guidance and test on a small batch first. Adding too much can lead to surface staining or reduced strength.
Q: Can I use this render accelerator in all types of render or mortar?
A: Yes, calcium chloride flake render accelerator can be used in most standard cement-based renders, plasters, and mortars. However, it’s not suitable for mixes containing aluminum components or some polymer-modified systems unless compatibility has been confirmed through testing.
Q: What precautions should I take when handling calcium chloride flakes?
A: Wear gloves and eye protection to prevent irritation.
Avoid inhaling dust; use a mask if necessary.
Store in a cool, dry, airtight container, as calcium chloride absorbs moisture from the air.
Q: Will using a render accelerator affect the long-term durability of my render?
A: When used at the correct dosage, calcium chloride render accelerators do not significantly affect long-term strength or durability. Overuse, however, can lead to reduced bonding or surface cracking, so always follow recommended mixing ratios and curing practices.
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