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The series is designed for coating applications where silicone needs to form a flexible, durable layer on glass fiber, cloth or sponge substrates.
| Property | IOTA LSR 3430 Series |
|---|---|
| Material Type | Addition liquid silicone rubber |
| Main Process | Coating |
| Main Substrates | Glass fiber, fiberglass cloth, sponge |
| Appearance | Transparent |
| Available Grades | IOTA 3425, 3430, 3440, 3450 |
| Hardness | Shore A 26–52 |
| Tensile Strength | 3.5–8.0 MPa |
| Elongation at Break | 300–450% |
| Tear Strength | 8–25 kN/m |
| A/B Ratio | 1:1 or 2:100, depending on grade |
| Maximum Storage Temperature | 32°C |
| Usable Storage Life | 9 months from production |
| Mixed Pot Life | 48 hours at 25°C |
| Main Applications | Fiberglass coating, cloth coating, sponge coating |
The values above are typical characteristics for the listed grades and should be evaluated according to the specific production application.
Fiberglass-coated silicone rubber is a liquid silicone rubber formulated to form a silicone coating on substrates such as glass fiber, fiberglass cloth and sponge.
The silicone coating can provide a combination of mechanical strength, flexibility and adhesion to the substrate.
For industrial coating applications, material selection should consider:
Substrate type
Required coating thickness
Adhesion
Tensile strength
Tear strength
Elongation
Hardness
Curing speed
Mixing ratio
Production equipment
IOTA LSR 3430 Series is specifically described for coating glass fiber, cloth and sponge.
The three main characteristics stated for the series are high strength, good adhesion performance and fast vulcanization.
The listed tensile strength ranges from 3.5 to 8.0 MPa depending on the grade.
Tear strength ranges from 8 to 25 kN/m.
These properties are important when the silicone coating needs to withstand mechanical stress during handling or use.
IOTA LSR 3430 Series is designed for coating applications and provides adhesion performance on substrates such as glass fiber, cloth and sponge.
Good substrate adhesion helps the silicone coating remain attached to the underlying material during subsequent processing and use.
Actual adhesion performance should be confirmed using the specific substrate and production conditions.
The IOTA 34 Series cures rapidly at elevated temperatures.
Actual curing time depends on both product thickness and curing temperature. Therefore, production curing conditions should be established according to the actual coating thickness and equipment.
The four listed grades provide different combinations of hardness, strength and processing characteristics.
| Grade | A/B Ratio | Hardness | Density | Tensile Strength | Elongation | Tear Strength |
|---|---|---|---|---|---|---|
| IOTA 3425 | 1:1 | Shore A 26 | 1.06 g/cm³ | 4.0 MPa | 450% | 8 kN/m |
| IOTA 3430 | 1:1 | Shore A 31 | 1.09 g/cm³ | 3.5 MPa | 400% | 10 kN/m |
| IOTA 3440 | 2:100 | Shore A 38 | 1.06 g/cm³ | 5.0 MPa | 300% | 12 kN/m |
| IOTA 3450 | 2:100 | Shore A 52 | 1.10 g/cm³ | 8.0 MPa | 330% | 25 kN/m |
All listed grades have a transparent appearance.
The IOTA 3430 Series covers Shore A hardness from 26 to 52.
A lower-hardness silicone coating generally provides a softer and more flexible coating structure, while higher-hardness grades provide a firmer silicone layer.
For example:
IOTA 3425: Shore A 26, 4.0 MPa tensile strength and 450% elongation
IOTA 3430: Shore A 31, 3.5 MPa tensile strength and 400% elongation
IOTA 3440: Shore A 38, 5.0 MPa tensile strength and 300% elongation
IOTA 3450: Shore A 52, 8.0 MPa tensile strength and 330% elongation
The appropriate grade should be selected according to the required flexibility, coating strength and substrate characteristics rather than hardness alone.
IOTA 3450 has the highest listed tensile strength at 8.0 MPa.
Its listed mechanical properties are:
Hardness: Shore A 52
Tensile strength: 8.0 MPa
Elongation: 330%
Tear strength: 25 kN/m
Density: 1.10 g/cm³
IOTA 3440 provides 5.0 MPa tensile strength and 12 kN/m tear strength, while IOTA 3425 and IOTA 3430 provide lower hardness options.
IOTA 3450 has the highest listed tear strength at 25 kN/m.
The tear strength values of the four grades are:
IOTA 3425: 8 kN/m
IOTA 3430: 10 kN/m
IOTA 3440: 12 kN/m
IOTA 3450: 25 kN/m
Tear strength is an important consideration when the coated material may experience cutting, bending, pulling or repeated mechanical stress.
The required A/B mixing ratio depends on the selected grade.
IOTA 3425 and IOTA 3430 use an A:B ratio of 1:1 by weight.
IOTA 3440 and IOTA 3450 use an A:B ratio of 2:100 by weight.
Because the ratios are different between grades, the selected product and mixing equipment should be checked before production.
Components A and B are filtered and de-aired before delivery.
For production, meter-mix equipment is strongly recommended because it can:
Pump the two components separately.
Meter the components at the required ratio.
Mix the components continuously.
Reduce the incorporation of air during mixing.
This is particularly useful for continuous or high-volume coating processes where consistent mixing is required.
If air bubbles become entrapped during mixing, the mixed silicone should be thoroughly degassed under vacuum.
A typical production process can be organized into the following steps:
Select the grade according to substrate, required hardness, mechanical strength and curing conditions.
Use the specified mixing ratio for the selected grade.
Meter-mix equipment is recommended for production to reduce air incorporation.
Apply the mixed silicone to the glass fiber, fiberglass cloth or sponge substrate using the appropriate coating process.
The required coating thickness should be controlled according to the final product design.
The IOTA 34 Series cures rapidly at elevated temperatures.
The actual curing time depends on coating thickness and curing temperature.
IOTA LSR 3430 Series is specifically listed for:
The silicone can be used as a coating material for glass fiber substrates.
Fiberglass cloth can be coated with silicone to create a composite material combining the properties of the silicone layer and reinforcing cloth.
The product series is also listed for coating sponge materials.
Substrate preparation and actual adhesion should be evaluated using the intended substrate before mass production.
After Components A and B are mixed, the mixture remains usable for 48 hours at 25°C, according to the product information.
Pot life can be an important consideration for production planning because the mixed material should be used within the applicable working period.
Production teams should also consider temperature, coating equipment and process conditions when establishing actual working procedures.
The product should be stored at or below 32°C in the original unopened containers.
The stated usable storage life is 9 months from the production date.
For production consistency, containers should remain sealed until use and should be stored according to the manufacturer's specified conditions.
Curing of the IOTA 34 Series can be inhibited by contact with certain materials.
The product information specifically identifies:
Amines
Sulfur
Tin compounds
These substances should be avoided during processing because they may interfere with silicone curing.
Material compatibility should be evaluated whenever new additives, substrates, release agents or processing chemicals are introduced.
Fiberglass-coated silicone rubber is a liquid silicone material used to coat glass fiber or fiberglass cloth. IOTA LSR 3430 Series is also listed for coating sponge substrates.
The listed grades range from Shore A 26 to Shore A 52.
IOTA 3450 has a listed tensile strength of 8.0 MPa.
IOTA 3450 has a listed tear strength of 25 kN/m.
IOTA 3425 and IOTA 3430 use an A:B ratio of 1:1. IOTA 3440 and IOTA 3450 use an A:B ratio of 2:100.
Yes. The product is specifically described for coating glass fiber or cloth.
Yes. Sponge coating is one of the listed applications.
The mixed material has a stated pot life of 48 hours at 25°C.
The product should be stored at or below 32°C in unopened original containers.
The IOTA 34 Series cures rapidly at elevated temperatures. The actual curing time depends on coating thickness and curing temperature.
When selecting fiberglass-coated silicone rubber, manufacturers should evaluate the application in the following order:
1. Substrate → 2. Required hardness → 3. Tensile strength → 4. Tear strength → 5. Elongation → 6. Mixing ratio → 7. Coating thickness → 8. Curing temperature and time
For applications requiring higher mechanical strength, IOTA 3450 provides the highest listed tensile strength and tear strength in the series.
For applications requiring lower hardness and higher elongation, IOTA 3425 provides Shore A 26 hardness and 450% elongation.
For intermediate requirements, IOTA 3430 and IOTA 3440 provide different combinations of hardness and mechanical properties.
IOTA LSR 3430 Series is a fiberglass and cloth coating liquid silicone rubber designed for applications requiring high strength, good adhesion and fast vulcanization.
The series includes four grades with Shore A hardness from 26 to 52, tensile strength from 3.5 to 8.0 MPa, elongation from 300% to 450% and tear strength from 8 to 25 kN/m.
The two available mixing-ratio systems are 1:1 and 2:100 by weight, depending on the grade. Meter-mix equipment is recommended for production, while vacuum degassing is required when air becomes entrapped during mixing.
The material is mainly used for coating glass fiber, fiberglass cloth and sponge. Grade selection should be based on substrate compatibility, required coating properties, mechanical requirements and curing conditions.
