IOTA M3055 A/B is a thermosetting liquid silicone rubber specifically designed for seals and injection molding components. It is a two-component product with a 1:1 weight ratio. It features rapid thermal curing, excellent demolding properties, and good mechanical performance. Product description: This series covers seven hardness levels from Shore A 10 to 70. The mixed viscosity is approximately 250–380 (at 23°C, 10 s⁻¹), making it suitable for injection molding and complex structural products. Technical indicators
First, compare the key indicators under the same conditions.
Model Hardness HA Stretch Strength MPa Extension Rate % Tear Strength KN/m Density g/cm³
Model Hardness HA Stretch Strength MPa Extension Rate % Tear Strength KN/m Density g/cm³
M3055-10 10 5 800 12 1.08
M3055-20 20 7 650 20 1.10
M3055-30 30 7 600 25 1.11
M3055-40 40 8 580 30 1.11
M3055-50 50 10 500 40 1.12
M3055-60 60 9 400 35 1.12
M3055-70 70 9 340 32 1.14
The viscosity unit is marked as "23℃, 10S⁻¹", which should be understood as the viscosity value under the condition of 23℃ and a shear rate of 10 s⁻¹. When making inquiries, it is necessary to confirm with the supplier whether this unit is equivalent to mPa·s or cP. Avoid directly converting according to other viscosity testing methods. Technical indicators
The logic of selecting based on hardness levels
Hardness range Typical characteristics Suitable scenarios
Hardness range Typical characteristics Suitable scenarios
10–20 HA Extremely soft, high elongation, low tear strength Extra soft seals, low contact force seals, soft touch components
30–40 HA Soft, good rebound, balanced overall performance Regular sealing pads, buttons, flexible joints
50 HA Medium hardness, highest tear strength (40 KN/m) General sealing components, injection molded parts, scenarios requiring balance of strength and elasticity
60–70 HA Relatively hard, good support, decreased elongation Seals requiring high compression support, structural components, parts with high wear resistance requirements
M3055-50 is the peak strength point of this series: tensile strength 10 MPa, tear strength 40 KN/m are both the highest in the entire series, suitable for sealing components with high requirements for mechanical properties. Technical indicators
Key verification items for seal selection
When choosing seals, one should not only consider hardness and tensile strength. The following items directly affect the actual service life:
Compression-induced permanent deformation
The core performance indicators of the sealing element. Excessive permanent deformation during compression will lead to a decrease in sealing force and an increase in leakage risk. Testing should be conducted according to the actual operating temperature and compression ratio.
Compression stress relaxation
The ability to maintain sealing force under long-term compression conditions is particularly important for static sealing.
Recovery elasticity and contact force
The lower the hardness, the smaller the contact force, but the rebound recovery ability needs to be verified to avoid the situation where the sealing surface cannot be fully filled after assembly.
Resistance to media
If in contact with oils, chemicals, coolant, or food media, the swelling rate, hardness change, and mechanical property retention rate need to be verified.
Operating temperature range
Thermosetting liquid silicone rubber usually has good resistance to high and low temperatures (typically ranging from -50°C to 250°C), but this depends on the product specifications.
Demolding properties and injection molding properties
This series is noted for its excellent demolding properties and rapid thermal curing, making it suitable for injection molding of complex components. However, the specific curing temperature and time need to be confirmed with the supplier. Product introduction, 3
Core differences from M3053-Y2.5
Comparison item M3055 A/B M3053-Y2.5
Comparison item M3055 A/B M3053-Y2.5
Application focus Sealing components Self-lubricating components
Hardness selection 10–70 HA (7 levels) 50 HA (single level)
Self-lubrication No special indication Persistent self-lubricating, oil-extracting type
Tear strength peak 40 KN/m (50 HA) 35 KN/m
Tensile strength peak 10 MPa (50 HA) 9 MPa
Typical applications Sealing pads, accessories, injection molded parts Self-lubricating silicone tubes, sealing pads, accessories
If self-lubrication, low friction, or reduced insertion force is required, M3053-Y2.5 should be preferred; if multiple hardness selections, conventional sealing, or complex structure injection molding is needed, M3055 A/B is more suitable. Product Introduction
How to verify from samples to mass production
First, agree on the acceptance items
Keep the batch records, hardness, tensile strength, tear strength, compressive permanent deformation, resilience and performance of the current materials, and convert them into checkable items.
Do small tests under the same conditions as the original
Keep the current materials as the control group and test them under the same injection equipment, curing temperature and time. When the process needs to be adjusted, another test group should be set up and the reasons should be recorded.
Test production under real conditions
After the small test meets the requirements, then verify the injection equipment, stability of the mixing ratio, filling integrity, demolding cycle, compressive permanent deformation, media resistance and product consistency.
Write the results in the purchase and change requirements
Record the approved model, hardness range, curing conditions, testing methods, applicable substrates and restrictions, and agree on COA, retention samples, batch traceability and change notifications.
What information to prepare before inquiring from the supplier
You can first provide the non-confidential application summary: seal type (static/dynamic/reverse/rotating), operating temperature range, contact medium, target hardness, injection or molding process, whether food grade or medical grade certification is required, current problems encountered and estimated purchase volume. When there are requirements for compressive permanent deformation, media resistance, resilience and compliance, the testing methods and acceptance standards should also be specified.
FAQ
How to choose the seven hardness levels?
The low hardness (10–20 HA) is suitable for ultra-soft sealing and low contact force scenarios; the medium hardness (30–50 HA) offers the best overall performance, among which 50 HA has the strongest mechanical properties; the high hardness (60–70 HA) is suitable for scenarios that require higher support and wear resistance. Technical indicators
2. Why is M3055-50 recommended as the starting point?
This model has a tensile strength of 10 MPa and a tear strength of 40 KN/m, both of which are the highest in the entire series. At the same time, the elongation rate of 500% still maintains good elasticity, making it suitable for most general seals and injection molding components. Technical indicators
3. Why is the data on permanent deformation not listed?
The data does not provide the values for compressed permanent deformation. This indicator is crucial for seals and it is recommended to obtain specific test data from the supplier and verify it yourself under the actual operating temperature and compression rate.
4. Can it be used in food or medical contact scenarios?
The materials do not clearly indicate food grade or medical grade certification. If used in such scenarios, corresponding compliance documents (such as FDA, LFGB, GB 4806.11, ISO 10993, etc.) must be obtained from the supplier and actual contact verification must be conducted.
5. Why must catalyst poisoning be avoided?
This product is a platinum-based catalytic polymerization system. When in contact with sulfur, phosphorus, nitrogen, organic tin, heavy metals or other inhibitory substances, it may result in non-curing, surface stickiness or incomplete curing. Important matters include pre-checking the base material, release agent, pigment and tooling.
6. Can the A/B components be mixed across batch numbers?
No. The materials clearly stipulate that only components of the same batch number A and B can be mixed for use. Mixing components from different batch numbers may affect the curing speed, hardness, and mechanical properties. Important Note
7. Can it still be used after more than 12 months?
The data shows that the storage period at a temperature below 23℃ and without opening the container is 12 months. Exceeding the shelf life does not necessarily mean it cannot be used, but the appearance, viscosity, mixing ratio, curing performance, hardness, tear strength, and compressive permanent deformation should be checked, and confirmed through small-scale tests. Storage and maintenance period