Abstract
Master Xiao Gao often gets asked a question by customers: "What is the difference between neutral silicone sealant and MS silane-modified sealant? How should I choose between them?"? ”
These two types of sealants are widely used in various fields such as construction, industry, and home furnishing, but they have different performance characteristics. Today, we will comprehensively analyze the differences between them, from their chemical nature to their application scenarios.
 Chemical essence: Different molecular structures determine different properties
Neutral silicone sealant (including weather-resistant sealant and structural sealant):
It primarily consists of polysiloxane and is also cured through moisture, but it forms a siloxane elastomer.
MS glue (modified silane polyether adhesive)
The chemical basis of this material is a modified silane-terminated polyether polymer. It undergoes moisture curing through silane groups, forming an elastic sealing layer.
This fundamental chemical difference directly leads to significant differences in their physical properties and application scopes.

Analysis 1: Neutral silicone adhesive (taking weather-resistant sealant as an example)

Scenarios where neutral silicone adhesive is preferred

• glass curtain wall：Structural assembly (structural adhesive), insulating glass sealing

• high-temperature environment：Sealing of kitchens, boiler rooms, and high-temperature equipment

• Highly expandable displacement joint：Curtain wall expansion joints, large steel structure joints

• Door and window installation：Sealing works for sunshine room, aluminum veneer, heavy-duty sliding door, system doors and windows, etc

Neutral silicone adhesive
Chemistry Basics: Polysiloxane (Silicone)
Curing method: Moisture curing, releasing neutral substances (such as oxime, alcohol)
Weather resistance: Excellent, especially resistant to high and low temperatures (-50℃~200℃)
Paintability: Not suitable for painting, with slightly difficult paint adhesion
Adhesive material: widely used, but exhibits weak adhesion to certain plastics (such as PE and PP)
Environmental friendliness: The oxime type has a slightly stronger odor compared to the alcohol type, and environmentally friendly products are continuously being improved
Displacement capability: Excellent (typically ±20% to ±35%)
Pollution resistance: prone to dust accumulation and pollution, especially low-grade products on the market

• Adhesion and material compatibility
  

It exhibits strong adhesion to non-porous materials such as glass, ceramics, and metals, but may require primer treatment for certain plastics (such as polyethylene and polypropylene) and untreated concrete surfaces。

• Environmental protection and construction experience

Some products may release a relatively strong odor (such as oxime type), while the alcohol type is relatively mild. Over long-term use, ordinary silicone adhesive may exhibit a "dust absorption" phenomenon, affecting its appearance.

• Mechanical properties and durability

With an extremely high elastic recovery rate and strong tensile resistance, it is particularly suitable for joints with large displacements such as expansion joints and curtain walls.

Neutral silicone adhesive has good elastic recovery and tensile resistance

(Left) Gaolide 9008 curtain wall weather-resistant sealant     VS   (Right side) Regular sealant

Excellent silicone weather-resistant sealant maintains good performance and remains uncracked even after prolonged use

• Surface treatment and aesthetics

After curing, the surface cannot be painted as paint cannot adhere to it. If color matching is required, only the color glue provided by the manufacturer can be used, which limits flexibility.

Analysis 2: MS modified silane polyether adhesive

Scenarios where MS glue is preferred

• Joints requiring painting: such as joints of colored metal plates, and interior decoration trimming

• Home decoration boards: such as background board bonding, cabinet back bonding

• Porous material sealing: indoor stone curtain wall joints, concrete joints

• Easy-to-pollute substrates: joints of light-colored stone materials, joints of decorative boards

(Left side) MS glue        VS     (Right side) Neutral silicone adhesive

MS glue (modified silane polyether adhesive)

Chemical basis: modified silane-terminated polyether
Curing method: Moisture curing, releasing methanol (environmentally friendly and low odor)
Weather resistance: UV resistance, maintaining elasticity over a long period
Paintability: It can be brushed and painted, and is compatible with various coatings
Bonding materials: widely used, including concrete, stone, metal, wood, etc
Environmental friendliness: VOC content is usually lower, making it more environmentally friendly
Displacement capacity: Excellent vibration resistance and fatigue resistance, typically with a low elastic modulus
Pollution resistance: Good anti-pollution performance, not prone to dust accumulation

• Adhesion and material compatibility

It boasts an extremely wide range of bonding materials and exhibits excellent bonding strength to engineering metals, concrete, wood, and more, particularly excelling on porous materials such as concrete and stone. It is generally suitable for bonding home decoration background boards, wooden boards, cold storage, and containers in indoor environments.

• Environmental protection and construction experience

During curing, the amount of methanol released is minimal, with a mild odor, making it more environmentally friendly for construction. Its low-pollution characteristics make it excel in joints of stone and light-colored boards, without causing substrate contamination due to oil infiltration.

• Mechanical properties and durability

The elastic modulus is typically low, with small internal stress, resulting in minimal stress on the substrate. It exhibits excellent vibration resistance and fatigue resistance, making it suitable for dynamic joints and vibrating scenarios.

• Surface treatment and aesthetics

One of the biggest advantages is its paintability. After construction, paint can be applied as needed to achieve a perfect integration with the building's appearance and meet the designer's requirements for uniform color.

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As a professional manufacturer in the field of silicone, Gaolide Silicone Industrial Co., Ltd. deeply understands the stringent requirements for sealing materials in different application scenarios. We not only provide:

• Neutral silicone adhesive series: It possesses excellent weather resistance and wide material adhesion.

• High-performance MS adhesive series: low odor, low pollution, meeting the needs of green buildings, with good brushability and wide range of material adhesion.

  
  

More importantly, we have an experienced technical team that can provide you with free consultation on model selection and construction guidance, ensuring that the sealant solution you choose achieves the optimal balance between performance, lifespan, and cost.
Making the right choice begins with a profound understanding of material properties. We hope this detailed comparison will assist you in making informed decisions. If you require further technical consultation or sample testing, please feel free to contact the Gaolide professional technical team - we are committed to safeguarding every project of yours with the most suitable sealing solutions.
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