Review of silicone glue, is it good? What is it used for and how much does it cost?

Silicone sealant is a type of sealant made from virgin silicone combined with additives and catalysts. The product has the ability to adhere to many surfaces such as glass, wood, ceramic, cement, concrete, iron, plastic and aluminum. According to November 2025 data, the price of silicone sealant ranges from 50.000 VND to 73.000 VND/bottle depending on the type.

Silicone glue is divided into two main types: Acid-based silicone (sour smell, cheap, strong adhesion to glass and ceramic tiles but corrosive) and neutral-based silicone (no strong smell, safer, does not corrode materials such as bamboo charcoal panels or foam panels).

The eight important technical parameters of silicone adhesive include tensile strength (MPa), elasticity, elongation, hardness (Shore A), surface drying time (5-30 minutes), complete drying time (24-48 hours), aging rate and extrusion ability of the adhesive.

The main applications of silicone glue include: Interior and exterior sealing, moisture resistance, aesthetic finishing, dust - wind - insect prevention, light vibration reduction, protection of electronic components and making handmade molds.

Specialized adhesives such as heat-resistant silicone adhesive (withstands up to 200°C), anti-mold silicone adhesive (with silver ion Ag+), fire-resistant silicone adhesive (withstands 150-300°C), and moisture-resistant silicone adhesive are widely used in construction and industry.

When choosing silicone glue, it is necessary to consider the purpose of use, clear origin, the feel of the glue, and technical parameters such as adhesion, elongation, and Shore A hardness. Silicone glue comes in many popular colors such as white, black, wood color (brown/yellow), red, and gray, making it easy to match the color with construction materials.

According to Market Research Future, the 2024 assessment of the adhesives market shows that: “The global adhesives and silicone sealants market was valued at around USD 7,40 billion in 2024 and is expected to reach USD 14,15 billion by 2034, growing at a compound annual growth rate (CAGR) of 6,7% during 2025–2034.”

What is silicone glue?

Silicone sealant is an elastic sealant made from virgin silicone combined with additives and catalysts. This type of sealant is popular in Vietnam and the world. The product adheres strongly to many surfaces such as glass, wood, ceramic, cement, concrete, iron, plastic and aluminum.

What are the advantages of silicone glue?

Silicone glue has 5 advantages:

1. Effective water and moisture resistance.
2. High elasticity, suitable for expansion joints.
3. Withstands outdoor temperatures and weather.
4. Long life, less aging when exposed to UV.
5. Good adhesion on glass, tiles, aluminum, stainless steel and most building materials.

What are the disadvantages of silicone glue?

Silicone glue has 4 disadvantages:

1. Do not use for gluing load-bearing materials (only use for filling and sealing).
2. Do not apply to oily or dirty surfaces.
3. Do not paint over the surface after it has dried.
4. Silicone acid has a strong odor and can corrode sensitive stones and metals.

8 Technical specifications of silicone glue

8 technical parameters of silicone glue include: Tensile strength, elasticity, elongation, hardness, surface drying time, curing speed, aging speed and extrusion ability. These are the indexes used to evaluate the durability, flexibility and stability of the glue during use.

Each glue line in each brand has different parameter values depending on the production formula. However, the 8 parameters below are general standards, directly reflecting features and performance of silicone in practice.

1. Tensile strength (MPa): Tensile strength before breaking (1,5 MPa = the glue joint can withstand a tensile force equivalent to 150kg/10 cm² without breaking).
2. Resilience (%): The level of elasticity of the glue and its ability to return to its original state (300% elasticity = can be stretched 3 times and still return to its original state).
3. Elongation (%): Maximum elongation before the glue breaks (400% elongation = glue can be stretched 4 times its length before breaking).
4. Shore hardness: Soft or hard glue after drying (Shore A 20 → soft; Shore A 40–50 → harder, better resistance).
5. Surface drying time: Time for the top layer of glue to no longer be sticky.
6. Curing speed (complete drying time): Time for the glue to reach its final hardness and strength.
7. Aging rate (life expectancy): Ability to maintain durability against UV – humidity – heat (10–20 years outdoors → no cracking, no yellowing).
8. Flowability of glue (shows thin or thick): How easy/difficult it is to dispense the glue from the tube.

How many types of silicone glue are there?

Silicone glue has two main groups: neutral silicone glue and acid silicone glue. Understanding the characteristics of each type helps users choose the right material suitable for the surface and construction requirements, minimizing corrosion or peeling after a period of use.

Acetoxy based silicone sealant

Acid silicone glue uses a curing mechanism that releases acetic acid, creating a smell similar to vinegar. This type of glue has been popular for a long time and has the following characteristics:

1. Very strong adhesion on glass and ceramic tiles.
2. Cheaper than neutral silicone, easy to find on the market.
3. Fast drying time, suitable for construction in areas that do not require acid resistance.

Acid-based silicone should be used when:

1. Glass stickers, fish tanks
2. Bathroom tile area
3. Items that do not come into contact with easily oxidized metals or materials that are susceptible to chemical attack.

Neutral Silicone Sealant (oxime/alcohol)

Neutral silicone sealant is a type of sealant no acid release during the curing process. Thanks to that, the product:

1. No sour smell, safer for the environment and health.
2. Does not corrode metals, natural stones and chemically reactive materials (bamboo charcoal panels, foam panels).
3. Good adhesion on many surfaces: glass, wood, stainless steel, plastic, aluminum, PVC panels, bamboo charcoal panels, molding, etc.

Neutral silicone should be used when:

1. When applied to materials such as bamboo charcoal panels because the neutral glue does not cause corrosion.
2. When requiring a durable, less discolored joint because the glue is more resistant to environmental impacts than acid glue.
3. When constructing closed interiors, it is necessary to limit odors because neutral silicone does not produce a sour smell like acid glue.
4. When working near electrical and electronic equipment, because the neutral glue does not release acid that corrodes components.

What is silicone glue used for?

Silicone sealant is a versatile sealant, used for sealing, moisture resistance and surface finishing in many interior and exterior projects. Thanks to its good adhesion and high elasticity, silicone has many applications from gap treatment, waterproofing to protecting components and crafting. Below are the 8 most common applications:

1. Interior and exterior gap filling: Used to fill gaps between wood - wall, glass - aluminum frame, brick - wall, helps prevent dust and keep the surface seamless.
2. Sealing against moisture and water: Creates watertightness in kitchens, sinks, bathtubs, and toilets, preventing water from seeping into tile or stone joints.
3. Aesthetically perfected edging: Create neat edges around worktops, sinks, panels and mouldings, concealing imperfections at small seams.
4. Prevent dust - wind - insects: Seal small joints such as glass door gaps, aluminum frame gaps, air conditioner pipe ends or washing machine pipes going through the wall.
5. Limit mold in humid areas: Cover the base of the wall and corners of the tiles where water often accumulates to reduce the risk of mold forming.
6. Insulation and protection of components: Cover electrical joints and small contacts to keep out moisture and protect electronic components.
7. Mild vibration reduction: Creates an elastic cushion at sliding glass doors or metal frames, helping to reduce noise and light vibration (not for heavy loads).
8. Create molds: Used in making molds for crafts, models or handmade products that require high detail.

How much does silicone glue cost?

Silicone glue prices (updated November 2025) range from 50.000 VND to 73.000 VND/bottle (depending on type).

Note: Reference price does not include VAT and other costs other than materials (November 2025).

Frequently asked questions about silicone sealants

How high temperature can silicone glue withstand?

Silicone glue can withstand temperatures up to 300°C. This high temperature resistant glue is suitable for engines and machine parts.

How to remove black mold on silicone?

You can remove black mold from silicone with household bleach in 5 easy steps. Here are the detailed instructions:

1. Take a tissue or cotton ball
2. Soak a cloth/cotton with concentrated household bleach.
3. Place directly on the moldy silicone area.
4. Leave it for about 15-20 hours
5. Rinse with water

This will give the bleach enough time to penetrate and kill the mold completely, leaving the silicone clean as new. Note: Test on a small area first to ensure the bleach does not damage or discolor the silicone.

How long does silicone sealant take to dry?

Silicone glue dries to the surface after 5-30 minutes and is completely dry after 24-48 hours. More specifically by type:

1. Acid-based silicone sealant: Surface drying time is faster, about 5-15 minutes.
2. Neutral base silicone sealant: Surface drying time is slower, about 8-30 minutes.

To ensure the best adhesion, after filling or bonding, the surface should be allowed to cure (dry) for about 24 hours before being fully used. The drying time of silicone sealant also depends on many factors such as application temperature, thickness of the sealant and humidity of the environment.

How to remove old silicone caulk?

You can remove old silicone caulk with a razor blade combined with a specialized solvent, strong detergent, mineral spirits, or high temperature. Here are instructions for removing caulk from 5 different surfaces:

1. On the wall: Use a razor blade to gently remove the hardened glue, then apply glue remover to the remaining area and scrape it off with a soft cloth.
2. On glass: Use a glass scraper, then apply a degreaser and wipe clean with soap and water.
3. On clothes/fabrics: Apply glue remover, gently scrub by hand, then wash with warm soapy water.
4. On brick: Use heat (like a hair dryer) to soften the glue, then scrape it off with a knife and clean with glue remover.
5. When on hands: Wash with warm water and soap, or use a soft cloth soaked in mineral spirits/nail polish remover to wipe.

What size gap can silicone sealant fill?

Silicone sealant works best when filling small to medium gaps, around 3–13mm.

With larger gaps, the glue is likely to shrink, reducing adhesion and not ensuring durability. When dealing with large gaps, it is necessary to combine foam filler, primer or supporting materials to increase adhesion such as primer.

How many popular colors of silicone glue are there?

Silicone glue has 5 main color groups popular on the market:

1. White (clear white/milky white): Most popular color, used for glass, sinks, toilets, ceramic materials, metal, plastic.
2. Black: Usually a neutral, safe, UV-resistant glue, used for walls, signs, and dark decorative details.
3. Wood color (brown/yellow): Matches wood color, used for wooden furniture, handicrafts, doors, floors, tables, chairs, shelves.
4. Red: Usually RTV (room temperature vulcanization) type, high heat resistant, used for places that need insulation/heat resistance up to about 300°C.
5. Gray: Commonly used in filling aluminum, alu, advertising, containers, interior/exterior panels.

Manufacturers create many different colors to meet aesthetic needs (matching the color of the material, hiding glue lines). Color also helps to quickly identify the function, for example red for heat-resistant type. Each color is suitable for different construction contexts such as gray for aluminum, clear white for glass.

How many ways to package silicone glue?

Silicone glue has 3 main packaging forms: bottles, sausages and buckets/barrels:

1. 280-310ml silicone glue bottle: Most popular form, used with glue gun.
2. Sausage silicone glue 400-600ml: Suitable for large projects, helps reduce packaging waste.
3. Pail: Used in industry in large quantities.

What are the benefits of using anti-mold silicone glue?

Anti-mold silicone glue brings 2 main benefits: Effective anti-mold and health protection. The product is supplemented with antibacterial and anti-fungal substances (such as silver ion Ag+), which helps prevent mold from growing in humid environments.

What are the characteristics of fireproof silicone glue?

Fireproof silicone sealant is a specialized sealant that prevents the spread of fire. The product is effective in fire protection thanks to its special silicone ingredients that create an insulating layer. The sealant does not decompose when exposed to high temperatures and maintains its adhesion under the influence of fire. Most products withstand 150–300°C, some lines achieved 2-hour fire resistance according to international standards

What is special about waterproof silicone glue?

Special waterproof silicone glue creates a long-lasting watertight membrane, resistant to UV – ozone – high temperature. The product adheres strongly to many difficult materials such as glass, metal, mortar, cement.

When to choose silicone sealant over other sealants

The table below summarizes how to choose the right sealant for each application.

How to deal with dried silicone glue?

You can treat dried silicone sealant by softening or breaking down the sealant with a specialized solvent, strong detergent, benzine, laundry detergent, or high heat. Then wipe or scrape it off. Here are five specific methods:

1. Using Terpanol Power: Special solvents dissolve the glue, making it easier to scrape off; test on a small area first to avoid damaging the surface.
2. Use strong detergent Cif: Apply to dry glue and wait a few minutes for the glue to soften; suitable for most indoor surfaces.
3. Using aromatic gasoline: Helps break down glue quickly, suitable for small areas; need to wear mask and gloves because the smell of gasoline is quite strong.
4. Using washing powder: The softening effect is weaker than other solvents but is easy to find, safe and suitable for removing glue from clothes.
5. Using heat (fire or hair dryer): Make the glue softer and easier to wipe; once the glue has softened, wipe it immediately with a damp cloth to prevent it from hardening again.

How to choose the right silicone glue?

Choose the right silicone glue based on 4 main criteria: purpose of use, origin, glue appearance, and technical specifications.

1. Uses: Acid glue is suitable for aluminum glass surfaces and acid-resistant materials. Neutral glue is used for sensitive surfaces such as bamboo charcoal panels, iron, steel, copper, and concrete.
2. Origin: You should choose glue with clear origin to ensure the quality of raw materials.
3. Glue feel: Should not be too clear (lots of solvents, easy to shrink) or too opaque (lots of impurities, reduced lifespan). Should not be too liquid (lots of solvents) or too thick (difficult to apply).
4. TImportant technical criteria:
   
5. Adhesion: Ability to adhere to various types of surfaces.
6. Elongation: Should be between 300-550%.
7. Hardness: Shore A should be 25-35 (too hard is due to too much filler, too soft is due to too much solvent).
8. Packaging: Should use flexible HDPE plastic to prolong storage time.

Choosing the right type of silicone glue will help your project be more durable and safer, suitable for each specific usage condition.

Where to buy quality silicone glue?

You should buy silicone glue at a store specializing in glue - construction chemicals or go to Kosmos Vietnam dealer.

Silicone glue distributed by Kosmos Vietnam ensures quality with the following factors:

1. Meets European standard EN 15651 and management systems ISO 9001 – ISO 14001 – ISO 45001, ensuring stability and safety during use.
2. Neutral curing, Non-corrosive to materials. Suitable for bamboo charcoal panels, foam, plastic and sensitive surfaces.
3. High durability and elasticity (elongation ≥450%, hardness 30 Shore A). The product is suitable for environments with temperature changes from -40°C to 120°C, suitable for both interior and exterior use.
4. Quick drying (12–30 minutes surface), helping to shorten construction time.
5. Reasonable price (about 57.000 VND/310ml bottle in November 2025) suitable for workers and civil works.
6. Brown color is easy to match with many decorative materials, especially wood plastic and panels.
7. Widely distributed genuine products, easy to buy - easy to check labels, expiration date, reducing the risk of poor quality goods.

Watch a visual video of Kosmos A500 silicone glue here

Kosmos Vietnam is ready to provide further advice on silicone glue in general and Kosmos A500 silicone glue in particular via phone number: 0932.067.388With over 10 years of experience distributing decorative materials, Kosmos will help you find the right glue for your needs.