Fumed Silica Thixotropic Powder M5

Fumed Silica Thixotropic Powder M5 Mesh 325

Fumed Silica M5 Mesh 325 is a high-performance thixotropic additive used to control sagging, improve viscosity and strengthen resin systems. Ideal for epoxy, polyester and vinyl ester resins, this ultra-fine silica powder creates smooth non-sagging mixtures for bonding, filling and composite repairs. Supplied in a sealed 100g tub, with 200g and 300g sizes also available.

Key Features:

1. Premium M5 Mesh 325 grade fumed silica thickening agent.
2. Produces non-sag resin mixes for vertical surfaces.
3. Improves strength and hardness in adhesive compounds.
4. Suitable for epoxy, polyester and vinyl ester resins.
5. Ultra-lightweight amorphous silicon dioxide powder.

Uses:

1. Thickening epoxy resin systems.
2. Producing structural adhesive compounds.
3. Creating smooth filleting mixtures.
4. Preventing resin run and sagging.
5. Composite, fibreglass and marine repairs.

📋 Product Details:

Weight: 100g Tub
Grade: M5 Mesh 325
Form: Ultra-fine white powder
Chemical Name: Silicon Dioxide (SiO₂)
CAS Number: 112945-52-5 / 7631-86-9
Mesh Size: 325 Mesh
Type: Hydrophilic Fumed Silica
Appearance: White fluffy powder
Function: Thixotropic / Anti-sag additive
Applications: Epoxy resin, adhesives, coatings, sealants, GRP, fibreglass, composites
Storage: Store sealed in a dry environment
Available Sizes: 100g, 200g, 300g tubs

Technical Information:

Fumed Silica M5 Mesh 325 is a chemically prepared amorphous silicon dioxide designed to increase viscosity and improve handling characteristics in resin systems. Even small additions provide excellent thixotropic control and anti-settling properties. Commonly used in composite manufacturing, marine repairs and structural adhesive formulations.

The powder forms a three-dimensional reinforcing network within resin mixtures, improving non-sag behaviour while enhancing strength and hardness. Due to the increased hardness, cured surfaces may become more difficult to sand.

How to Use:

1. Thickening Epoxy Resin

• Mix resin and hardener first.
• Slowly add 2–10g of silica per 100ml resin.
• Stir thoroughly until desired viscosity is reached.

2. Creating Non-Sag Adhesive Paste

• Add silica gradually until a paste consistency forms.
• Apply to vertical or overhead surfaces without dripping.

3. Filleting Composite Joints

• Mix to a smooth peanut-butter consistency.
• Apply using a spatula or filleting tool.
• Smooth edges before curing.

4. Gap Filling & Repairs

• Blend silica into resin until stiff.
• Press into cracks, voids or damaged fibreglass sections.
• Allow full curing before sanding or coating.

5. Coatings & Anti-Settling Applications

• Add small amounts (1–3g per 100ml coating).
• Improves suspension stability and reduces sagging during application.

Safety Information:

• Avoid inhaling dust during handling.
• Use gloves, eye protection and a P2 dust mask or respirator.
• Use in well-ventilated areas.
• Keep container tightly sealed and dry after use.

📈 Other Names:

Fumed Silica Powder, Thixotropic Powder, Epoxy Thickener, Silica Thickener, Aerosil Alternative, Cabosil Alternative, Anti-Sag Additive, Resin Thickener, Colloidal Silica Powder, Fibreglass Resin Additive, Composite Filler Powder, Structural Adhesive Additive, GRP Resin Thickener, Silicon Dioxide Powder, Non-Sag Resin Filler, M5 Silica Thickener, Mesh 325 Silica Powder.

❓FAQ:

1. What does Fumed Silica M5 Mesh 325 do?

It thickens resin systems and creates non-sagging mixtures for bonding, filling and repair work.

2. Can it be used with epoxy resin?

Yes, it is widely used with epoxy, polyester and vinyl ester resin systems.

3. How much should I add to resin?

Typically 2–10g per 100ml resin depending on the thickness required.

4. Is this the same as Cabosil or Aerosil?

Yes, it performs similarly to Cab-O-Sil and Aerosil style fumed silica products.

5. Does it make resin stronger?

Yes, it improves structural strength and hardness when used in adhesive or composite mixes.