The IOTA G30-305 series is a moldable silicone rubber specifically designed for automatic injection processes. It is platinum-catalyzed and mixed in a 1:1 weight ratio. After curing, it is transparent, highly resilient, and has a smooth feel, meeting food-grade requirements. The product introduction states that it is suitable for silicone mold products, syringe injection products, and scenarios requiring high detail replication and low shrinkage rate for precision mold replication.
Can the viscosity and hardness of the same type of moldable liquid silicone rubber be directly replaced? No. When selecting the model, one should first confirm the platinum catalytic system, viscosity testing conditions, operation time, curing curve, shrinkage rate, food-grade compliance documents, and then combine the mold accuracy, mold flipping times, injection process and contact medium to evaluate the demolding performance, detail replication ability, tear strength and long-term stability. Whether to adopt it ultimately should be jointly confirmed by small-scale tests, trial production and product verification.
First, compare the key indicators under the same conditions
This product is a two-component A/B type, mixed in a 1:1 weight ratio, and both the A and B components are transparent. Technical indicators
Model Hybrid Viscosity at 23℃ Hardness (HA) Stretch Strength Extension Rate Tear Strength
G30-305 70000 28–32 ≥6 MPa ≥500% ≥20 KN/m
G30-405 80000 39–42 ≥7 MPa ≥500% ≥20 KN/m
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 an inquiry, it is necessary to confirm with the supplier whether this unit is equivalent to mPa·s or cP. Avoid directly converting it based on other viscosity testing methods. Technical indicators
Before making the selection, it is recommended to clarify the following points:
Viscosity and fluidity: G30-305 has a lower viscosity and is more suitable for molds with complex details, thin walls, or those requiring better filling; G30-405 has a slightly higher viscosity and higher hardness, and is more suitable for molds that require higher support and resistance to deformation.
Operation time and curing curve: The operation time, surface drying time, room temperature curing time, and heating curing time are not provided in the materials. They need to be confirmed by the supplier.
Shrinkage rate and dimensional stability: Resin-based silicone rubber usually has a lower shrinkage rate, but for precision molds, the linear shrinkage rate or volume shrinkage rate still needs to be confirmed. Product Introduction
Food grade compliance documents: The product is labeled as food grade, but corresponding certifications or test reports should be obtained and confirmed to match the target contact food, temperature and duration.
Platinum catalytic compatibility: Platinum catalysts are sensitive to substances such as sulfur, phosphorus, nitrogen, tin, and heavy metals. It is necessary to confirm whether the mold substrate, release agent, pigment, and tooling will cause catalyst poisoning. Important matters
What differences are worth checking
Comparison method Relation to application
Comparison method Relation to application
Viscosity and molding capacity Compare at 23℃ and actual injection temperature Effect on thin-wall filling, detail replication and bubble residue
Operation time and curing speed Confirm the operable time and demolding time under room temperature/heating conditions Decide injection cycle, production efficiency and mold turnover
Hardness and rebound Compare the actual demolding performance of Shore A 28–32 and 39–42 Soft molds are easy to remove complex parts, while hard molds have better size stability
Tear strength and mold flipping life Observe under repeated demolding, stretching and bending Effect on mold service life and edge damage risk
Food grade and migration risk Obtain certification documents and conduct actual contact verification Food molds cannot be judged for suitability based solely on the "food grade" label
Determine verification priorities according to application
Precision silicone mold application
Key verification points: detail replication ability, shrinkage rate, demolding performance, mold flipping times and tear strength. G30-305 has a lower hardness, suitable for complex structures, more reverse insertion or molds requiring high elastic demolding; G30-405 has a higher hardness, suitable for molds requiring better support, less deformation. Typical applications
Automatic injection/syringe injection application
Key to confirm the impact of viscosity on injection equipment, including injection pressure, filling integrity, bubble residue, mixing uniformity and curing speed. The injection process is sensitive to the operating time window, and the appropriate temperature and cycle should be determined through gradient tests.
Food contact mold application
Even if the product is labeled as food grade, the certification scope, food types of contact, usage temperature, contact duration and cleaning methods should be confirmed. If used for molds for chocolate, cakes, candies, handmade soaps, etc., additional verification of odor, migration, grease resistance and cleaning performance should be conducted. Main features
High transparency appearance requirements application
Products A/B components and after curing are transparent, suitable for molds or products with appearance requirements. However, transparent adhesives are more sensitive to bubbles, impurities and uneven mixing, and the mixing, defoaming and filling process needs strict control.
How to verify from samples to mass production
First, agree on acceptance items
Keep the batch records of the current materials, viscosity, hardness, tear strength, shrinkage rate, demolding performance and food grade documents, and convert them into checkable items.
Do small tests under the same conditions
Keep the current materials as a control, test under the same substrate, release agent, mixing ratio, defoaming method, curing temperature and time. When the process needs to be adjusted, another test group should be listed and the reasons recorded.
Test production under real conditions
After the small test meets the requirements, then verify the automatic injection equipment, mixing head, injection pressure, filling integrity, demolding cycle, mold flipping life and product consistency. Food contact applications need to complete verification according to target regulations and contact conditions.
Write the results in purchase and change requirements
Record the approved model, viscosity range, hardness range, operating time, curing conditions, testing methods, applicable substrates and restrictions, and agree on COA, retention samples, batch traceability and change notification.
The basis for judgment should be the pre-agreed acceptance criteria, rather than "viscosity close" or "hardness similar". If the candidate material only passed a certain test, the conclusion should also be limited to that test and corresponding conditions.
What information to prepare before contacting the supplier
An unclassified application summary can be provided first: material usage, target hardness, injection or molding process, substrate type, release agent, whether food-grade certification is required, operating temperature, contact medium, current problems encountered, target market and expected purchase quantity. When there are requirements for operation time, curing speed, shrinkage rate, release performance and food compliance, the testing methods and acceptance standards should also be specified.
As a solution provider for the entire organic silicon industry chain, Aiyota can discuss candidate specifications for the material range of the G30-305 series and the customer's working conditions. After the initial selection, the corresponding technical documents, safety documents and batch inspection files should be checked. The specific applicability is confirmed through actual application verification.
FAQ
How to choose between G30-305 and G30-405?
If you need better fluidity, softer demolding and higher detail replication capabilities, you can give priority to evaluating G30-305; if the mold requires higher hardness, stronger support and anti-deformation ability, you can give priority to evaluating G30-405. Both have a tear strength of ≥20 KN/m and an elongation of ≥500%, with the main differences lying in viscosity and hardness. Technical indicators
2. Is the viscosity of 70000/80000 suitable for injection?
This viscosity level is suitable for some injection or infusion processes, but whether it is suitable for automatic injection also depends on the injection equipment, mixing head, injection pressure, mold structure and curing speed. It is recommended to conduct filling tests on the actual equipment and molds.
3. Can food-grade be directly used in all food contact scenarios?
It cannot be directly equivalent. Food-grade certification usually has an applicable scope, types of food it can contact, temperature and time restrictions. When used in molds for chocolate, cakes, candies, etc., the certification documents should be confirmed and actual contact verification should be conducted.
4. Why must catalyst poisoning be avoided?
This product is a platinum catalytic polymerization system. When in contact with sulfur, phosphorus, nitrogen, organotin, heavy metals or other inhibitory substances, it may result in non-curing, surface stickiness or incomplete curing. Important matters include the base material, release agent, pigment and tooling that should be checked in advance.
5. Can it still be used after more than 12 months?
The data shows that at a temperature below 23℃, the unopened barrel storage period is 12 months. Beyond the shelf life, it does not necessarily mean it cannot be used, but the appearance, viscosity, mixing ratio, curing performance, hardness, tear strength and food-grade compliance should be checked, and a small-scale test should be conducted to confirm.
Storage and retention period
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, mechanical properties and transparency. Important matter