The IOTA G30-303 series is a moldable silicone rubber specifically designed for semi-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. Compared to the G30-305 series, the G30-303 series has a lower mixing viscosity (36,000–38,000) and is easier to undergo vacuum defoaming, making it suitable for mold applications with higher exhaust requirements or more precise detail replication. Technical indicators
First, compare the key indicators under the same conditions.
This product is an A/B two-component product, mixed in a 1:1 weight ratio. Both the A and B components are transparent. Technical indicators
Model Hybrid Viscosity at 23℃ Hardness (HA) Stretch Strength Extension Rate Tear Strength
G30-303 36000 28–32 ≥6 MPa ≥500% ≥20 KN/m
G30-403 38000 39–42 ≥6 MPa ≥500% ≥20 KN/m
The viscosity unit is labeled 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. Before making a selection, it is recommended to clarify:
Viscosity and defoaming ability: The mixed viscosity of the G30-303 series is approximately 36,000–38,000, significantly lower than that of the G30-305 series (70,000–80,000). During vacuum defoaming, bubbles are more likely to be expelled, making it suitable for thick-walled molds or complex structures. Main features
Operation time and curing curve: The operation time, table dry time, room temperature curing time, and heating curing time are not provided in the data. It is necessary to supplement and confirm with the supplier.
Shrinkage rate and dimensional stability: Thermosetting silicone rubber usually has a low shrinkage rate, but precise molds still need to confirm the linear shrinkage rate or volume shrinkage rate. Product Introduction
Food grade compliance documents: The product is labeled as food grade, but corresponding certifications or test reports (such as FDA, LFGB, GB 4806.11, etc.) should be obtained, and it should be confirmed whether it matches the target contact food, temperature and duration.
Platinum catalytic compatibility: Platinum catalysts are sensitive to sulfur, phosphorus, nitrogen, tin, heavy metals, etc. It is necessary to confirm whether the mold substrate, release agent, pigment and tooling will cause catalyst poisoning. Important matters
Core differences between G30-303 and G30-305
Comparison item G30-303 series G30-305 series
Comparison item G30-303 series G30-305 series
Melt viscosity at 23℃ 36000–38000 70000–80000
Applicable process Semi-automatic injection Full-automatic injection
Ease of defoaming Lower viscosity, easier vacuum defoaming Higher viscosity, slightly more difficult defoaming
Hardness selection 28–32 / 39–42 HA 28–32 / 39–42 HA
Tensile strength ≥6 MPa ≥6 / ≥7 MPa
Tear strength ≥20 KN/m ≥20 KN/m
Elongation rate ≥500% ≥500%
The G30-303 series has a lower viscosity and is more suitable for scenarios requiring better exhaust and defoaming; the G30-305 series has a higher viscosity and is more suitable for scenarios where better shape retention is required in fully automatic injection equipment. The hardness ranges and mechanical properties of both are basically the same. When choosing, the main consideration is to distinguish based on the process viscosity requirements.
Determine verification priorities according to the purpose
Precision silicone mold application
Key verification points include detail replication ability, shrinkage rate, demolding performance, mold flipping times and tear strength. The G30-303 series has a lower viscosity and better filling ability for fine textures, but attention should be paid to whether low-viscosity glue materials require barriers on vertical surfaces or complex structures.
Semi-automatic injection/needle injection application
It is necessary to focus on confirming the impact of viscosity on injection equipment, including injection pressure, filling integrity, bubble residue, mixing uniformity and curing speed. Low-viscosity glue materials are easier to fill, but they are also more likely to overflow from the parting surface, so the mold fitting clearance should be optimized.
Food contact mold application
Even if the product is labeled as food grade, it is necessary to confirm the certification scope, food contact types, usage temperature, contact time and cleaning methods. If used for chocolate, cakes, candies, handmade soaps, etc., additional verification of odor, migration, grease resistance and cleaning performance is required.
High transparency appearance requirements application
Both product A/B components and the cured product are transparent, suitable for molds or products with appearance requirements. Low-viscosity glue materials are more sensitive to bubbles, and the vacuum defoaming process is particularly crucial.
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-scale control tests under the same conditions
Keep the current materials as a control, and test under the same base materials, release agents, mixing ratios, defoaming methods, curing temperature and time. When the process needs to be adjusted, another test group should be set up and the reasons recorded.
Test production under real conditions
After the small-scale test meets the requirements, then verify semi-automatic injection equipment, mixing head, injection pressure, filling integrity, demolding cycle, mold flipping life and product consistency. For food contact applications, the verification should be completed according to the target regulations and contact conditions.
Write the results in purchase and change requirements
Record the approved model, viscosity range, hardness range, operation time, curing conditions, testing methods, applicable base materials and restrictions, and agree on COA, sample retention, batch traceability and change notification.
The basis for judgment should be the pre-agreed acceptance standards, not "viscosity close" or "hardness similar". If the candidate material only passes a certain test, the conclusion should also be limited to that test and the corresponding conditions.
What information should be prepared before inquiring from the supplier
You can first provide an unclassified application summary: 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 estimated purchase quantity. When there are requirements for operation time, curing speed, shrinkage rate, defoaming performance and food compliance, the testing methods and acceptance standards should also be specified simultaneously.
As an integrated solution provider for the entire organic silicon industry chain, Aijota can discuss candidate specifications around the material range of the G30-303 series and the customer's operating conditions. After the initial selection, the corresponding technical documents, safety documents and batch inspection files should be checked, and the specific applicability is confirmed through actual application verification.
FAQ
How to choose between G30-303 and G30-403?
Both have similar viscosities (36000 vs 38000), with the main difference being in hardness. G30-303 has a hardness of 28–32 HA, which is softer and suitable for complex structures and high elasticity demolding; G30-403 has a hardness of 39–42 HA, providing better support and suitable for molds that need to resist deformation. Technical indicators
2. How to choose between G30-303 and G30-305?
The main factor to consider is the required process viscosity. G30-303 has a lower viscosity (36,000–38,000), making it easier for defoaming and suitable for semi-automatic injection and scenarios with high exhaust requirements; G30-305 has a higher viscosity (70,000–80,000), offering better shape retention and suitable for fully automatic injection equipment. Technical indicators
3. Is the viscosity of 36,000 suitable for injection?
This viscosity level is suitable for some injection or infusion processes, but whether it is suitable for semi-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.
4. 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 come into contact with, temperature and time restrictions. When used in molds for chocolate, cakes, candies, etc., the certification documents (such as FDA, LFGB, GB 4806.11) should be confirmed and actual contact verification should be conducted.
5. 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, which should be checked in advance.
6. Can it still be used after more than 12 months?
The data shows that below 23℃, the unopened barrel storage period is 12 months. Beyond the shelf life 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
7. 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