Silicone Sealant | APOLLO Silicone Sealant A250

APOLLO Silicone Sealant A250

APOLLO Silicone Sealant A250 is a one-part cure acid silicone sealant that will not discolor or crack when used outdoors or in inclement weather. The product can adhere to most building materials but is especially suitable for sealing glass borders and window frames.
View user manual
View user manual
Hightlighted features
High elasticity Good adhesion. Fast-drying
Clear white, milky white, gray, black
25 cartridges/box
Not suitable for certain types of plastic. Need to use a primer with some materials
Technical features
No subsidence
Skin-over time
11 minutes
Specific Gravity
1.01 +- 0.05
Hardness - Shore A
Tensile strength (Mpa)
Movement Capability (%)
Construction surface temperature
5 degrees Celsius to 40 degrees Celsius
Thermal resistance
-50 degrees Celsius to 150 degrees Celsius

Apollo Silicone Sealant A250 

Silicone Sealant - A “powerful ally” in construction and interior design projects. Particularly, the Apollo Silicone Sealant A250 stands out as a product capable of withstanding harsh weather conditions, suitable for both indoor and outdoor construction projects.

Introduction to Apollo Silicone Sealant A250

The Apollo Silicone Sealant A250 is a one-part acid-cure silicone compound with high elasticity, capable of enduring various weather conditions, moisture, ozone, and ultraviolet rays. Apollo A250 remains unaffected in terms of color and resistance to cracking when used outdoors, regardless of severe weather conditions.

Actual image of Apollo Silicone Sealant A250

Product benefits

The benefits of Apollo Silicone, whether in general or specifically with Apollo Silicone Sealant A250, lie in its ability to easily bond and adhere to surfaces. All Apollo sealant products can withstand the impact of harsh weather conditions. Therefore, for outdoor projects, whether in rain, shine, stormy weather, or even snow, the product consistently ensures superior bonding quality.

Additionally, this heat-resistant silicone adhesive is highly regarded, even under intense sunlight at 40 degrees Celsius, without undergoing deformation or melting. Therefore, customers can have complete confidence in projects where this adhesive is used.

Product application

Apollo A250 silicone sealant is widely used in most construction projects, including both indoor and outdoor settings. Particularly outdoors, its excellent weather resistance ensures consistent joint quality.

Product features

Apollo silicone sealant cures at room temperature when exposed to humid air without compromising its quality or bonding strength. Customers can easily use this adhesive in various construction details during their construction projects.

The heat resistance of Apollo Silicone Sealant A250 is quite commendable, ranging from -50 degrees Celsius to 150 degrees Celsius. Therefore, the adhesive consistently maintains its maximum capability to uphold stable quality in projects over prolonged periods.

Real-life applications of Apollo Silicone Sealant A250

Product characteristic features

Here are the highlighted features of the Apollo Silicone Sealant A250:

At standard conditions (25°C, 50% humidity):

  • Indentation and sagging: None

  • Working time (estimated): 5 minutes

  • Surface curing time: 8 minutes

  • Curing rate and working time vary with temperature and humidity

  • Specific gravity: Clear 1.01 / Other colors 1.35

After 7 days of curing (25°C, 50% humidity):

  • Hardness measurement according to ASTM D412: Clear 22 / Other colors 36

  • Maximum tensile strength according to ASTM D412: 1.5 MPa

  • Maximum elongation according to ASTM D412: 500%

  • Temperature stability: -50 to 150°C

These specifications illustrate the stability and performance of the product under varying conditions, providing clarity on the capabilities and limitations of the Apollo A250 in different applications. This is why Apollo Silicone is acclaimed as "Apollo Silicone - Bonding for life".

Product Packaging

The packaging of Apollo A250 features a design with three predominant colors: purple, white, and the Apollo brand's signature green. Additionally, a tube of sealant typically holds a volume of 300 ml. This compact and convenient sealant tube is suitable for easy application in any location.

Guide for using the Apollo Silicone Sealant A250

When using the sealant for filling, perfect joint bonding, customers can be assured of the absolute quality that Apollo Silicone Sealant A250 provides.

Apollo Silicone A250 can be used for many filling - sealing - bonding purposes
Apollo Silicone A250 can be used for many filling - sealing - bonding purposes


  • Clean the area where Apollo Silicone Sealant needs to be applied.

  • Remove dust, old sealant residue, and any other substances from the surface.

  • Solvents such as MEK, IPA, Acetone should be used to clean the surfaces requiring sealing.

Product Usage

Here's how to use Apollo A250:

Surface Preparation:

  • Ensure the surface is thoroughly clean and dry.

  • Remove any oil and dirt before applying.

Apply Masking Tape and Use Silicone Sealant:

  • Apply masking tape around the area that needs to be treated.

  • Apply Apollo A250 silicone sealant to the surface needing sealing or bonding.

Finish Sealing and Remove Masking Tape:

  • Complete the sealing or bonding as per project requirements.

  • Remove the masking tape after applying the sealant.


  • Store the sealant at temperatures between 5°C to 30°C.

Avoid Sunlight Exposure:

  • Prevent direct exposure of the product to sunlight.

Child Safety:

  • Keep out of reach of children.

For optimal adhesion, users should perform a test before usage. In some cases, the use of primer paint may be necessary to ensure proper adhesion. If needed, you can contact Apollo Silicone's office for technical advice and support.

Some notes on using Apollo Silicone Sealant A250

When purchasing the Apollo A250, essential information about the product is surely provided on the packaging. Before usage, customers should read and thoroughly understand the necessary details.

Product expiration date and storage conditions

The shelf life of Apollo Silicone is 12 months from the manufacturing date printed on the packaging. After use, the sealant bottle needs to be stored in a way that prevents air from getting inside. Furthermore, the product should be kept at temperatures below 30°C.

Therefore, distributors of the sealant should also take care to keep the product in a dry place below 30°C. For used sealant tubes, customers need to tightly seal the tube mouth to avoid any air getting inside. If air infiltrates, the quality and adhesion capability of the sealant might alter.

Product limitations

Here are some limitations that customers need to understand before using the product:

  • Avoid using the product to bond materials affected by oils, plasticizers, solvents, or incompletely cured rubber pads or linings.

  • Material surfaces might corrode or change color when exposed to acid vapors during the silicone curing process (such as zinc-plated steel, copper, brass, or other metals, concrete surfaces, cement panels, tiles, limestone, quartzite, or high porous stone surfaces, etc.).

  • Sealing waterproof joints on premium facades.

  • In locations where the sealant does not come into contact with air.

  • Porous quartzite and high porous stone surfaces.

  • Joints requiring an elongation greater than +15.

  • Overpainting after curing as paint cannot adhere to silicone.

  • Plastic sheets.

Health and Environmental Information

All Apollo Silicone products are manufactured from top-grade materials sourced from two renowned global corporations, Dow and ShinEtsu. These materials not only guarantee high-quality but also comply with safety and environmentally friendly standards. For more details on our product catalog and partners, please visit our official website:

Introducing the Apollo Silicone App

Apollo Silicone has developed the Apollo Silicone App with numerous convenient features, meeting the demands of customers. Here is some information about the application:

  • Updates on customer care policies, events, seminars, competitions, etc., specifically tailored for customers.

  • QR code scanning feature on the silicone sealant bottle to verify authenticity, distinguishing between genuine and counterfeit products.

  • Regular updates on the newest product information with useful functionalities.

Customers can use the Apollo Silicone app to scan the QR code to verify the authenticity of the product

The Apollo Silicone app is now available on both Android and iOS platforms. Customers can easily download and use it for free. Download the Apollo Silicone app now to experience these convenient features and receive attractive offers!

Summary of the Apollo Silicone Sealant A250

We have provided customers with essential information about the Apollo Silicone Sealant A250. Through this, users can gain a better understanding of the brand's product, ensuring proper application for maximum efficiency in bonding and sealing various materials.

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Keo silicone dán kính Apollo giải pháp hoàn hảo cho mọi công trình
Keo silicone dán kính Apollo giải pháp hoàn hảo cho mọi công trình
Keo silicone dán kính Apollo giải pháp hoàn hảo cho mọi công trình
Keo silicone dán kính Apollo giải pháp hoàn hảo cho mọi công trình
Keo silicone dán kính Apollo giải pháp hoàn hảo cho mọi công trình