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EXPANDAG Expansive Mortar Technical Manual: Product Selection, Application & Safety
This EXPANDAG technical reference provides practical information for selecting, preparing and applyingExpansive Mortar (Soundless Cracking Agent, HSCA) in quarrying, demolition, construction and other controlled rock-breaking applications.
The guide brings together the main technical subjects covered by the EXPANDAG product manual, including product grades, temperature selection, borehole preparation, mixing, filling, crack development, storage, safety, troubleshooting and technical support.
Quick Answer: What Is Expansive Mortar?
Expansive Mortar, also known as Soundless Cracking Agent (HSCA), is a calcium-oxide-based non-explosive cracking material used for controlled cracking of rock and concrete. After the powder is mixed with water and filled into properly prepared boreholes, a hydration reaction generates expansion pressure inside the holes. The resulting pressure acts against the surrounding material and can gradually create cracks without relying on explosive detonation.
Correct temperature-grade selection, borehole preparation, water ratio and safe filling procedures are important for achieving predictable application results.
About This EXPANDAG Technical Manual
Selecting the correct expansive mortar is only one part of a successful rock-breaking project. The application process also depends on borehole diameter, hole spacing, material condition, temperature, mixing ratio, filling method and safety procedures.
The official EXPANDAG product manual was developed as a practical reference for customers, contractors, quarry operators, distributors and technical personnel working with Soundless Cracking Agent (HSCA).
This online version summarizes the main technical subjects covered by the manual and provides a convenient starting point before downloading the complete technical document.
EXPANDAG Technical Manual Overview
| Product | Expansive Mortar / Soundless Cracking Agent (HSCA) |
| Manufacturer | Hezhou Topking Rock Drill Equipment Co., Ltd. |
| Brand | EXPANDAG |
| Main Applications | Quarrying, Mining, Demolition and Construction |
| Technical Version | Version 1.0 · 2026 |
What Does the EXPANDAG Manual Cover?
The complete technical manual covers the main stages of an expansive mortar application, from product selection to field troubleshooting.
| Section | Main Topic |
|---|---|
| 1 | What Is Expansive Mortar? |
| 2 | How Does Expansive Mortar Work? |
| 3 | Product Grades & Temperature Selection |
| 4 | Borehole Pattern Planning |
| 5 | Preparation & Mixing |
| 6 | Filling & Crack Development |
| 7 | Application Areas |
| 8 | Storage & Material Condition |
| 9 | Safety & Blowout Prevention |
| 10 | Field Troubleshooting |
| 11 | Quality Control & Technical Support |
| 12 | Packaging & International Shipment |
1. What Is Expansive Mortar?
Expansive Mortar, also known as Soundless Cracking Agent (HSCA), is a non-explosive rock and concrete cracking material. Unlike conventional explosives, it does not depend on explosive detonation to break the material.
The EXPANDAG product is based on a calcium-oxide formulation. After the powder is mixed with the recommended amount of water, a chemical hydration reaction takes place and generates expansive pressure inside the drilled boreholes.
When the generated pressure exceeds the local tensile resistance of the surrounding material, cracks can gradually develop along the designed drilling pattern.
Key Principle
The effectiveness of expansive mortar depends not only on the material itself, but also on correct product selection and field application. Temperature, borehole conditions, water ratio and drilling pattern should be considered together.
2. How Does Expansive Mortar Work?
The basic chemical reaction can be represented as:
CaO + H2O → Ca(OH)2 + Heat
calcium oxide + water → calcium hydroxide + heat
When water is added to the expansive mortar powder, calcium oxide reacts with water and forms calcium hydroxide. The hydration process produces heat and causes the material to expand inside the confined borehole.
Because the borehole provides confinement, the expansion generates pressure against the surrounding rock or concrete. Properly positioned boreholes guide the resulting cracking toward the desired separation line.
3. EXPANDAG Product Grades & Temperature Selection
Temperature is one of the most important factors when selecting an HSCA grade. EXPANDAG provides different grades for different application temperature ranges.
| Product Grade | Recommended Temperature Range | Typical Application |
|---|---|---|
| HSCA-1 | 25–40°C | Warm-temperature applications |
| HSCA-2 | 10–25°C | Moderate-temperature applications |
| HSCA-3 | -5–10°C | Cold-temperature applications |
These temperature ranges should be treated as product reference ranges. Actual project conditions should be evaluated before application, especially when rock temperature and ambient air temperature differ.
Why Is Temperature So Important?
Using a grade that does not match the actual application conditions can affect the reaction rate and crack development. A grade that reacts too quickly may increase the risk of a blowout, while an unsuitable grade in colder conditions may react more slowly than expected.
For this reason, professional application should consider the actual borehole and rock conditions rather than relying only on a general weather forecast.
EXPANDAG Engineering Note
One common application mistake is selecting an HSCA grade only according to outdoor weather conditions. The temperature of the rock and drilled boreholes can differ from the reported air temperature, particularly when the rock has been exposed to direct sunlight. For projects with changing temperatures, checking the actual borehole conditions before filling can help avoid using a grade that reacts too quickly or too slowly.
4. Borehole Preparation and Pattern Planning
Borehole design is another important part of expansive mortar application. Hole diameter, depth, spacing and layout influence how the generated pressure is transferred into the surrounding material.
The EXPANDAG manual recommends borehole diameters in the range of30–42 mm for its standard application guidance.
| Parameter | Reference Range | Application Note |
|---|---|---|
| Borehole diameter | 30–42 mm | Select according to project conditions |
| Hole spacing | Project dependent | Depends on material and required crack line |
| Hole depth | Project dependent | Depends on material thickness and drilling plan |
The values above are reference guidance rather than universal installation rules. Different rock types, concrete structures, block dimensions and cracking requirements may require different drilling patterns.
5. Preparation and Mixing
Before mixing, confirm the selected HSCA grade and check that the product has been stored in suitable conditions. Moisture exposure can affect the condition and performance of expansive materials.
Recommended Mixing Ratio
The EXPANDAG manual specifies a typical water mixing ratio of approximately28–30%.
This means the amount of water should be controlled carefully during preparation. Adding excessive water can change the consistency and reaction characteristics of the mixed material.
Important Mixing Reminder
Do not select the water amount by appearance alone. Follow the product's specified mixing ratio and application instructions. Do not add additional water after the mixture has been prepared unless the technical procedure specifically requires it.
6. Filling the Boreholes and Crack Development
After the boreholes have been prepared and the material has been mixed correctly, the slurry is filled into the drilled holes according to the application procedure.
The filled boreholes provide confinement for the expansion reaction. As the internal pressure develops, stress is transferred into the surrounding rock or concrete.
Cracks may first appear as fine lines before developing into visible separation. Crack development time depends on temperature, material condition, borehole design and the selected product grade.
Do Not Judge Performance Too Early
A project should not be evaluated only from the first few hours after filling. The expected reaction period depends on the grade and actual field conditions. Monitoring should be carried out according to the technical instructions and site safety requirements.
7. Where Is Expansive Mortar Used?
Expansive Mortar can be used in situations where controlled cracking or separation is required and conventional blasting is unsuitable or restricted.
| Application Area | Description |
|---|---|
| Granite & Marble Quarrying | Controlled cracking of natural stone and quarry blocks. |
| Secondary Rock Breaking | Breaking oversized rock after primary extraction or excavation. |
| Concrete Breaking | Controlled cracking of concrete structures and large concrete sections. |
| Construction & Demolition | Applications where controlled separation is required without conventional explosive blasting. |
8. Storage and Material Condition
Moisture is one of the main storage risks for expansive mortar. The product should remain sealed and protected from humidity before use.
The EXPANDAG manual gives a 12-month shelf-life reference under suitable storage conditions. Older material should be evaluated before use rather than assumed to have the same performance as freshly manufactured material.
Recommended Storage Practices
Keep the original packaging sealed and protected from moisture.
Store the material in a dry environment.
Avoid direct exposure to rain, humidity and water.
Use stock according to production date where practical.
Evaluate older or moisture-exposed material before a major project.
9. Safety and Blowout Prevention
Expansive mortar generates substantial internal pressure during the reaction. Although it is a non-explosive cracking material, incorrect application can create safety hazards.
The main factors requiring attention include product grade selection, water ratio, borehole temperature, drilling conditions and access control around the filled holes.
Critical Safety Rules
Use the correct HSCA grade for the actual application temperature.
Follow the specified water mixing ratio.
Keep personnel away from filled boreholes during the reaction period.
Do not look directly into a filled borehole.
Follow the manufacturer's safety instructions and project-specific procedures.
Wear appropriate personal protective equipment during preparation and filling.
For complete safety information, users should consult the product SDS and the official EXPANDAG technical manual before starting a project.
10. Field Troubleshooting Guide
When an expansive mortar application does not perform as expected, the problem should be investigated systematically rather than changing several variables at the same time.
| Check First | Possible Issue |
|---|---|
| Temperature | Actual rock or borehole temperature may differ from the selected grade. |
| Product Grade | The selected grade may not match the field conditions. |
| Water Ratio | Incorrect water quantity can affect mixture condition and reaction. |
| Borehole Condition | Blocked, damaged or improperly prepared holes can affect filling and pressure development. |
| Drilling Pattern | Hole spacing, depth and diameter may not be suitable for the material. |
| Material Condition | Moisture exposure or unsuitable storage may affect product condition. |
11. Quality Control and Technical Support
For professional quarrying and construction projects, product quality should be considered together with technical support and batch control.
Before placing a large order, buyers can request technical documentation such as product specifications, SDS documentation, batch information and application guidance. Sample testing under actual project conditions can also provide useful information before full-scale application.
EXPANDAG Technical Support
For projects with unusual rock conditions, temperature changes, large block dimensions or special drilling requirements, technical consultation before application can help determine a more suitable product grade and application plan.
12. Packaging and International Shipment
EXPANDAG Expansive Mortar is supplied for international B2B projects and is packaged to protect the powder from moisture during transportation and storage.
The standard packaging information in the product documentation includes20 kg cartons, with bulk packaging options available for larger orders.
For international shipments, buyers should confirm the current product SDS, applicable transport classification, customs requirements and destination-country import rules before shipment.
Expansive Mortar Technical FAQ
The following questions address common product selection, application and purchasing questions related to Expansive Mortar and Soundless Cracking Agent (HSCA).
Q: Is Expansive Mortar the Same as HSCA and Soundless Cracking Agent?
Short Answer:
In many international construction and quarrying markets, Expansive Mortar, Soundless Cracking Agent and HSCA are used for the same general category of non-explosive cracking materials. Product formulations and terminology can vary by supplier.
For buyers, the important points to compare are the actual formulation, temperature grade, application instructions, technical data and safety documentation rather than the product name alone.
Q: Which HSCA Grade Should I Use?
Short Answer:
The grade should be selected according to the actual application temperature. EXPANDAG provides HSCA-1, HSCA-2 and HSCA-3 for different temperature ranges.
The actual rock and borehole conditions should be considered before selection. When site conditions change significantly during the application period, technical guidance should be obtained before changing the product grade.
Q: What Borehole Diameter Is Recommended for Expansive Mortar?
Short Answer:
The EXPANDAG manual provides a reference borehole diameter range of approximately30–42 mm.
The final drilling pattern should be determined according to the rock or concrete conditions, material dimensions and project requirements. Borehole diameter alone does not determine the final cracking result.
Q: How Should Expansive Mortar Be Stored?
Short Answer:
Keep the product sealed and protected from moisture. Suitable dry storage is important because moisture exposure can affect the condition of the material.
The EXPANDAG manual gives a 12-month shelf-life reference under suitable storage conditions. Older or moisture-exposed material should be evaluated before use.
Q: Can I Test Expansive Mortar Before Placing a Large Order?
Short Answer:
Yes. Sample testing under actual project conditions is a practical way to evaluate product behavior before a large-scale order.
Buyers can also request technical documentation, product specifications, SDS information and batch information from the supplier before placing a bulk order.
Q: Why Did My Expansive Mortar Not Crack the Rock as Expected?
Short Answer:
Poor cracking results can be related to temperature, product grade, water ratio, borehole condition, drilling pattern or material condition.
Troubleshooting should be carried out systematically. Check the actual borehole temperature, selected grade, mixing ratio, hole condition, drilling pattern and product storage history before changing several variables at the same time.
Download the Complete EXPANDAG Technical Manual
EXPANDAG Expansive Mortar
Soundless Cracking Agent (HSCA)
Product Instruction & Application Manual
Version 1.0 · 2026
The complete manual covers product selection, technical data, borehole preparation, mixing, filling, crack development, applications, storage, safety, troubleshooting, quality control and technical support.
Download the EXPANDAG Technical Manual (PDF)
Related EXPANDAG Technical Resources
For additional information about expansive mortar, HSCA selection, application and international procurement, see the following technical resources:
Need Technical Support for an HSCA Project?
If you are planning a quarrying, demolition or construction project and need help selecting the appropriate expansive mortar grade, evaluating borehole conditions or planning packaging for an international order, contact EXPANDAG with your project temperature, material type and drilling information.
Hezhou Topking Rock Drill Equipment Co., Ltd.
EXPANDAG Expansive Mortar & Soundless Cracking Agent
