IOTA M6020 is a two-component, one-component liquid silicone rubber that does not require two-stage curing. It has a VOC content of less than 0.5% and complies with BfR, FDA, and RoHS requirements. Product description, 1. Its core advantage is that it can meet food, infant and child, and medical compliance requirements with a single curing process, eliminating the traditional two-stage curing baking procedure and significantly improving production efficiency. Product description, 3.
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
M6020 25 7 650 20 1.10
M6030 30 7 600 25 1.11
M6040 40 8 580 30 1.11
M6050 50 10 500 40 1.12
M6060 60 9 400 35 1.12
M6070 70 9 340 32 1.14
The viscosity unit is Pa·s (23℃, 10 s⁻¹), and this value is relatively high (280–380 Pa·s), which is suitable for injection molding but requires matching the corresponding injection equipment. Technical indicators
What does "no two-stage curing" mean?
When traditional one-component liquid silicone rubber is used in the food/medical fields, it usually needs to be baked at 200℃ for several hours to remove residual low-molecular silicone oxides (D4/D5/D6) and volatile substances, in order to meet regulatory requirements. The drawbacks of two-stage curing include high energy consumption, occupation of space, large pieces being prone to yellowing and deformation, and thin-walled parts having size drift.
M6020 achieves VOC levels < 0.5% after one-stage curing through low-volatile raw material control and a formulation design without by-products for one-component curing, without the need for post-baking to meet the new national standard GB 4806.16-2025 for volatile substances.
However, it should be noted: "No two-stage curing" is a process name, not equivalent to natural compliance. Whether it can pass the test depends on the raw materials and the formulation itself. It is recommended to request a third-party test report from the supplier to confirm the actual VOC values and the content of low-molecular silicone oxides D4–D10.
Selection logic based on hardness grades
Hardness range Typical characteristics Suitable scenarios
Hardness range Typical characteristics Suitable scenarios
25–30 HA Extremely soft, high elongation rate Infant nipples, rubber toys, ultra-soft seals
40 HA Soft, balanced comprehensive performance Food container sealing rings, flexible joints
50 HA Strength peak (10 MPa tensile, 40 KN/m tear) General seals, injection molding accessories
60–70 HA Relatively hard, good support High-pressure seals, structural components
M6050 is the highest mechanical performance grade, with a tensile strength of 10 MPa and a tear strength of 40 KN/m, both of which are the highest in the entire series. Technical indicators
The core differences between M3054/M3055 and M6020 series
Comparison item M6020 series M3054/M3055 series
Comparison item M6020 series M3054/M3055 series
Core positioning No two-stage vulcanization, food/medical compliance Sealing parts dedicated / low compression permanent deformation
Hardness range 25–70 HA (6 levels) 10–70 HA (7 levels)
VOC < 0.5% (meets one-time vulcanization standard) Not marked
Compliance certification BfR, FDA, RoHS Not marked
Curing conditions明确 (130℃/90s or 150℃/45s) Not clear
Color Transparent Not marked
Application scenarios Clothing for infants and children， food contact， medical consumables General sealing parts， accessories
If the application involves food contact， infant and children's care， or medical consumables， and you want to skip the two-stage vulcanization process， M6020 is the preferred choice； if it is a general industrial sealing part and the compliance requirements are not high， M3054/M3055 may have a more cost advantage. Product Introduction
Key verification items for sealant selection
VOC and low-molecular silicone
According to GB 4806.16-2025 requirements, volatile substances should be ≤ 0.5%, and the total of D4–D10 should be ≤ 0.1 mg/kg. The supplier's test report needs to be obtained and verified on the actual product.
Compression-induced permanent deformation
The specific values are not listed in the data. If used for static sealing, they need to be tested according to the actual operating temperature and compression rate.
Migration test
If used for food contact, tests for total migration amount, potassium permanganate consumption, and metal migration, etc. should be conducted in accordance with GB 4806.16-2025.
Matching curing conditions
The data clearly states the curing conditions: 130℃/90 seconds or 150℃/45 seconds (2 mm thickness). The curing time corresponding to the actual product thickness needs to be confirmed to avoid insufficient or excessive curing.
Transparency and appearance
This series is made of transparent material, suitable for products with appearance requirements (such as baby and children's products). The transparency, bubbles, and flow marks after injection molding need to be verified.
How to verify from samples to mass production
Confirm compliance documents
Request BfR, FDA, RoHS, and GB 4806.16-2025 test reports to confirm key indicators such as VOC, D4–D10, and migration amount.
Conduct small-scale tests with the same conditions
Test under the same injection equipment, curing temperature, and time to verify the filling integrity, demolding performance, and mechanical properties.
Verify the curing curve
Test the curing degree at different temperatures and times for the actual product thickness to confirm the optimal process window.
Real production test under real conditions
After the small-scale test is successful, verify the injection equipment, stability of the mixing ratio, demolding cycle, and consistency of the finished product.
Record the purchase requirements
Record the approved model, hardness range, curing conditions, VOC acceptance standards, testing methods, and batch traceability requirements.
Information to prepare before contacting suppliers
Provide non-confidential application summaries: product type (nipples/sealing rings/medical items), target hardness, injection or compression molding process, operating temperature range, whether compliance with GB 4806.16-2025 is required, current problems encountered and expected purchase volume. When there are clear requirements for VOC, compression permanent deformation, and migration amount, the testing methods and acceptance standards should also be specified.
FAQ
1. Is post-curing really not necessary for the two-step vulcanization process?
The data shows that VOC is less than 0.5%, and one vulcanization process can meet the compliance requirements for food/medical products. Product introduction: 3 However, it is recommended to verify the VOC and migration amount on the actual product to confirm whether it meets the regulations of the target market.
2. How to choose the six hardness levels?
Baby and children's products should be selected at 25–30 HA, food sealing products at 40–50 HA, and structural components at 60–70 HA. The M6050 has the strongest mechanical properties. Technical indicators
3. Why is the data on permanent deformation not listed?
The information is not provided. This indicator is crucial for the sealing components and it is recommended to obtain specific test data from the supplier and verify it under actual usage conditions.
4. How is the curing time determined?
The reference value given in the materials is 2 mm thickness: 130℃/90 seconds or 150℃/45 seconds. The curing conditions need to be adjusted when the actual product thickness varies. It is recommended to conduct a curing curve test for confirmation.
5. Can it be used for medical implants?
The materials only indicate compliance with BfR, FDA, and RoHS, but do not mention ISO 10993 or USP Class VI. If used for medical implants, a biological compatibility report from the supplier should be obtained.
6. Why must catalyst poisoning be avoided?
The platinum catalytic system may not cure or the surface may become sticky when in contact with substances such as sulfur, phosphorus, nitrogen, and organic tin. Precautions should include checking the base material, release agent, and pigment in advance.
7. Can the A/B components be mixed across batch numbers?
No. Only components A and B of the same batch number can be mixed and used together. Notes for Attention
8. Can it still be used after more than 12 months?
When stored at a temperature below 23℃ in an unopened container, the shelf life is 12 months. After the expiration date, viscosity, curing performance, hardness and VOC need to be tested. A small-scale test is conducted to confirm the results. Packaging and Storage