One cannot simply conclude that the product with high transparency, such as silicone 1310-1340 (a two-component room-temperature curing liquid silicone with a 10:1 ratio), is suitable for all resin molds, precise replication, or jewelry making systems just because it is highly transparent and has good resistance to tearing after curing. One must first confirm the A/B weight ratio, the uniformity of mixing, vacuum degassing, the pouring method, the material of the master mold and the mold frame, the environmental cleanliness, and the curing temperature before making such a judgment. Then, one should determine whether the problem is caused by a deviation in the ratio, residual bubbles, poisoning of the platinum catalyst, or an unsuitable match between the master mold and the resin.


Why do high transparency room-temperature curing mold silicone often have bubbles or fail to cure during mold replication?


If the A/B weight ratio is not accurately measured at 10:1 or is approximated by volume ratio, the curing may be incomplete or not occur at all.


If the mixing is insufficient or the mixing direction is inconsistent, a large number of bubbles are introduced into the rubber mixture, making it difficult to naturally release air at high viscosity.


If vacuum degassing is not performed, especially for 1310-1340 with a viscosity ranging from 25,000 to 80,000 centipoises, the bubbles are more difficult to escape.


When pouring the rubber, if it is poured all at once or from a low position, the flow time of the rubber is insufficient, and the bubbles are encapsulated in the details and corners of the master mold.


If the mold frame uses 502 glue and the mold is poured without a 30-minute interval or 50℃×10 minutes, the 502 glue causes poisoning and non-curing.


If the rubber comes into contact with compounds such as tin, phosphorus, ammonium, chlorine, carboxylic acid, thiol, and hydroxyl groups, a poisoning reaction occurs, resulting in local or overall non-curing.


If the surface of the master mold is not cleaned or there are release agents, oil stains, or dust, it affects the wetting of the rubber and the smoothness of the mold surface.


If the curing temperature is too low or the pouring time is 60±10 minutes which does not match the pouring rhythm, the rubber has partially cured before pouring.


When switching from condensation-type mold glue, ordinary RTV silicone, or other room-temperature curing mold glues, if the ratio, degassing, and pouring methods are not re-adjusted, it may cause bubble or abnormal curing.


If the storage conditions are improper or beyond the shelf life, the activity of the A/B components decreases, affecting the consistency of curing and transparency.


If there are clear requirements for high transparency, high tear resistance, or low shrinkage, but the actual master mold structure and resin type are not verified.


If dust, fibers, or impurities fall into the rubber, it affects transparency, surface smoothness, and mold lifespan.


First, determine at which stage the bubble or curing problem occurs.


Failure stage Possible causes Priority inspection direction
There are many bubbles in the mixed rubber air entrainment during mixing, no vacuum treatment, high viscosity Mixing method, vacuum degassing, model selection
Bubbles are encapsulated in the details of the master mold after pouring Improper pouring method, insufficient flow time of the rubber Pouring height, pouring position, rubber viscosity
There are bubbles or spots on the mold surface Unclean master mold surface, interference from release agents, insufficient vacuum degassing Master mold treatment, compatibility of release agents, degassing process
Local or overall non-curing A/B ratio deviation, poisoning of 502 glue, contact with tin, phosphorus, ammonium, chlorine, etc. Accuracy of ratio, mold frame glue, source of contamination
Decreased transparency or fogging after curing or fogging Impurities mixed in, ratio deviation, improper curing temperature Environmental cleanliness, ratio, curing conditions
Insufficient tear strength or prone to damage Incorrect model selection, insufficient curing, mismatch of tear resistance indicators Model hardness, curing conditions, tear resistance requirements
Mold deformation or size deviation due to shrinkage High curing temperature, thick rubber layer, mold structure Curing temperature, rubber layer thickness, shrinkage rate verification
Fluctuations in curing or transparency between batches A/B component activity difference, storage conditions, measurement error Incoming inspection, storage records, measurement accuracy
If only the "whether product 1310-1340 was used" is considered without recording the A/B weight ratio, vacuum degassing, pouring method, mold frame glue, and pollution source control, it is usually difficult to accurately determine whether it is a material issue or a process issue.


Why is merely increasing the vacuum degassing time or raising the curing temperature not necessarily effective?


Product 1310-1340 plays a role in the addition curing process in the mold flipping system. It is affected by the ratio, degassing, pouring method, mother mold, and pollution sources. Simply extending the vacuum degassing time or increasing the temperature may bring side effects.


Extending the vacuum degassing time can reduce bubbles, but for high viscosity models, the bubbles escape slowly. Over-deep vacuuming may lead to the volatilization of low boiling point components or the formation of a crust on the surface of the rubber.


Increasing the curing temperature can accelerate the curing process, but it may cause an increase in mold shrinkage, a decrease in transparency, or deformation of the mother mold due to heating.


Increasing the total amount of A/B glue does not change the 10:1 weight ratio requirement. Excessive glue will not increase the strength but will cause waste.


Reducing the viscosity of the glue can improve degassing, but it may affect the mold's anti-tear strength and detail replication accuracy.


A deviation in the ratio or after poisoning in the 502 glue can also not allow for normal curing when extending the vacuum degassing time or increasing the temperature.


Improper pouring method causing bubbles, only vacuum degassing cannot completely eliminate the bubbles at the mother mold details.


When the mother mold surface is not cleaned, adjusting the degassing and curing conditions alone cannot solve surface blemishes and poor demolding.


After storage has expired or the activity has decreased, only increasing the temperature cannot restore the original curing performance.


Therefore, when optimizing, one should observe the A/B weight ratio, mixing method, vacuum degassing, pouring method, mold frame glue, mother mold treatment, and curing conditions simultaneously, rather than only adjusting a single parameter.


How should different models of product 1310-1340 be selected?


Working conditions IOTA-1310 candidate direction IOTA-1320 candidate direction IOTA-1330 candidate direction IOTA-1340 candidate direction Still need verification
Low hardness, high transparency molds Hardness 10±2, elongation rate ≥ 500%, suitable for soft and elastic molds Hardness 20±2, elongation rate ≥ 450% Hardness 30±2, elongation rate ≥ 350% Hardness 40±2, elongation rate ≥ 300% Demolding, detail replication, anti-tear
High tear-resistant, wear-resistant molds Tear resistance ≥ 4kN/m, suitable for low stress mold flipping Teardrop resistance ≥ 6kN/m Teardrop resistance ≥ 9kN/m Teardrop resistance ≥ 13kN/m, suitable for high-frequency or complex demolding Actual tear resistance, fatigue resistance, mold life
Low viscosity, easy degassing Viscosity 25000±5000, relatively easy degassing Viscosity 45000±5000 Viscosity 65000±5000 Viscosity 80000±5000, need to strengthen vacuum degassing Vacuum degree, degassing time, bubble residue
High tensile strength requirements Tensile 2.88MPa Tensile 3.10MPa Tensile 4.15MPa, maximum tensile Tensile 3.61MPa Actual tensile, fracture elongation, modulus
Precision jewelry and fine replication Soft and elastic, suitable for detail demolding General fine replication Higher hardness, size stability High hardness, suitable for large or high-support molds Mother mold details, shrinkage rate, transparency
Add AB water, PU, epoxy, Poli resin Need to verify chemical resistance and demolding performance Need to verify Need to verify Need to verify Resin type, heat release temperature, demolding agent
One cannot simply choose based on hardness because the viscosity, tear resistance, tensile strength and elongation rate of the four models are different. The final choice depends on the mother mold structure, resin type, demolding difficulty, mold life and degassing process.


What are the differences in the key points of product 1310-1340 selection compared to similar mold silicone rubber?


Comparison Direction: Product 1310-1340 (10:1 thermosetting high transparency mold adhesive) - Condensation type mold silicone - Ordinary thermosetting mold adhesive - Polyurethane mold adhesive - Selection Boundary
Curing Mechanism: Platinum-catalyzed thermosetting, 10:1 weight ratio - Moisture condensation curing - Platinum thermosetting - Two-component reaction curing - Selection depends on the material and process of the mother mold
Transparency: High transparency - General - General to semi-transparency - Varies by formula - High transparency jewelry and precise replication prefer this product
Shrinkage Rate: Almost no shrinkage - Large shrinkage - Low - Medium - Prefer thermosetting for high dimensional stability requirements
Tensile Strength Resistance: ≥ 4 - 13 kN/m, varies with model - General - Medium - High - Complex demolding and high-frequency mold flipping prefer high tensile strength models
Bubble Removal Difficulty: High viscosity models require enhanced vacuum bubble removal - Low viscosity easy bubble removal - Medium - Medium - Choose based on vacuum equipment and mold structure
Platinum Catalyst Poison Sensitivity: Sensitive to tin, phosphorus, ammonium, chlorine, carboxylic acid, mercaptans, hydroxyl groups, and 502 glue - Not involving platinum - Sensitive to toxins - Not involved - Need to strictly control mold frame adhesive and environmental pollution
Operation Time: 60 ± 10 minutes - Varies by product - Varies by product - Varies by product - Choose based on glue pouring and bubble removal rhythm
Applicable Scenarios: Precise molds, resin jewelry, fine product replication, precision machinery - General molds - General molds - Industrial molds - Choose based on resin type and replication accuracy
Why is it still necessary to conduct a complete test for compatibility with the mother mold and resin?


Our company's public information states that product 1310-1340 is used as an elastic mold material for AB water, PU, epoxy resin, 815 resin, Poli resin, PT, ABS materials, as well as for the production and replication of precision molds, resin jewelry, fine products, and precision machinery. However, when used in actual systems, there may still be:


Mother mold material, surface treatment, and release agent differences.


Mold frame adhesive, sealing materials, and pollution sources.


A/B weight ratio, mixing method, and vacuum bubble removal.


Glue pouring height, pouring position, and glue flow time.


Curing temperature, time, and layer thickness.


Resin type, heat release temperature, and compatibility with release agent.


Mold usage frequency, demolding method, and tensile strength requirements.


Environmental cleanliness, dust and fiber contamination.


Storage conditions and activity of A/B components.


Batch-to-batch curing consistency and transparency.


Appearance transparency or short-term curing compliance does not prove long-term mold flipping, resistance to resin heat release, or stability after repeated demolding. Before use, verification with complete ratio, actual mother mold and resin conditions should be conducted.


What parameters should be confirmed when using product 1310-1340?


Parameter Category: Information to be confirmed
Application Direction: Precision molds, resin jewelry, fine product replication, precision machinery
Mother Mold Type: Resin, metal, gypsum, wood, 3D printed parts, etc.
Surface Treatment: Cleaning method, release agent type, presence of oil and dust
Mold Frame Material: 502 glue, sealing strips, compatibility with silicone and rubber
A/B Ratio: 10:1 weight ratio, measurement accuracy and mixing uniformity
Mixing Method: Same direction mixing, mixing time, avoiding air entrapment
Vacuum Bubble Removal: Vacuum degree, bubble removal time, glue viscosity and temperature
Glue Pouring Method: Glue pouring height, pouring position, natural leveling
Curing Conditions: Temperature, time, whether to accelerate with heating
Model Selection: 1310, 1320, 1330, 1340 and target hardness, tensile strength, viscosity
Resin Type: AB water, PU, epoxy, 815 resin, Poli resin, PT, ABS
Storage Conditions: Cool and dry, sealed, use according to expiration date
Acceptance Indicators: Transparency, bubbles, hardness, tensile strength, elongation, shrinkage rate, demolding property
What should be verified when using product 1310-1340?


A/B weight ratio measurement accuracy and mixing uniformity.


Bubble content in the rubber after mixing and the vacuum defoaming effect.


Air entrainment and surface blemishes at the details of the mother mold after pouring the rubber.


Transparency, hardness and tear resistance after curing.


Tensile strength, elongation and almost no shrinkage characteristics.


Demolding and dimensional stability of the mold and the mother mold.


Chemical resistance and mold life after contact with AB water, PU, epoxy, polyurethane resin, etc.


The influence of 502 glue, tin, phosphorus, ammonium, chlorine and other contaminants on curing.


The matching of viscosity of different models with defoaming and pouring processes.


The consistency of curing among different batches and the fluctuation of transparency.


The activity and curing speed of A/B components after storage.


The effectiveness of safety operation and ventilation protection.


How to design experiments before using product 1310-1340?


Establish a benchmark of the current mold silicone rubber, record the model, A/B ratio, defoaming, pouring and curing conditions, and failure manifestations.


Uniform test conditions: mother mold, surface treatment, mold frame glue, A/B ratio, mixing method, vacuum defoaming, pouring method, curing temperature and time.


Set candidate samples: current mold glue, different hardness models of product 1310-1340, different defoaming and curing conditions gradients.


Complete the full process testing: mixing → vacuum defoaming → pouring → curing → demolding → transparency/air bubbles/mechanical properties testing → mold verification.


Evaluate the actual results: transparency, air bubbles, hardness, tear resistance, tensile, elongation, shrinkage rate, demolding performance, mold life.


Test items Uniform requirements
Mother mold and surface treatment Consistent
Mold frame glue Consistent or set according to test design
A/B ratio 10:1 weight ratio
Mixing and defoaming process Set gradient according to test design
Pouring method Set gradient according to test design
Curing conditions Set gradient according to test design
Measurement method Transparent, air bubbles, hardness, tear resistance, tensile, elongation, shrinkage rate, demolding performance consistent
Which situations are not suitable for directly using product 1310-1340?


The measurement accuracy of A/B weight ratio cannot be guaranteed or approximate matching by volume ratio leads to incomplete curing.


The mold frame was not separated from 502 glue for half an hour or 50℃×10 minutes before pouring the rubber, resulting in poisoning of the platinum catalyst.


The rubber came into contact with compounds such as tin, phosphorus, ammonium, chlorine, carboxylic acid, thiol, hydroxyl group, etc., resulting in non-curing.


High viscosity models were not defoamed by vacuum, leaving air entrainment at the details of the mother mold.


The pouring method was improper, with insufficient flow time of the rubber, resulting in severe air entrainment.


The surface of the mother mold was not cleaned or the release agent was incompatible with the room-temperature vulcanization silicone rubber, affecting demolding and surface smoothness.


Specific food contact, medical or airworthiness approvals are required, but corresponding data has not been obtained.


Only have the application direction, but no data on mold, ratio, defoaming, pouring and curing conditions.


The customer requests to directly mix it into the in-use system, but cannot control the ratio, defoaming and pouring process.


When switching from condensation-type mold glue or other room-temperature vulcanization mold glue, the ratio and defoaming process were not adjusted.


The storage conditions do not meet the requirements of cool and dry, sealed storage, and the activity of A/B components decreased.


There are strict requirements for transparency, tear resistance or mold life, but the actual mold and resin type have not been verified.


Our company can provide which selection support?


As a provider of the entire organic silicone chain, our company can assist in comparing the applicability of different hardness, viscosity and tear resistance models of product 1310-1340 in resin mold flipping, precise replication and jewelry making.


For precision molds, resin accessories, or fine product replication projects that require high transparency, high tear resistance, low shrinkage, and good demolding properties, the following information should be provided before selecting the type:


Application direction and mold base type.


Target hardness, tear resistance, tensile and elongation rates.


Mold compound viscosity and vacuum degassing equipment conditions.


A/B weight ratio, mixing and pouring process.


Frame glue and contamination control situation.


Curing temperature, time and layer thickness.


Contact resin type, heat release temperature and release agent.


Current mold glue model, ratio and failure performance.


Acceptance method and applicable standards.


After receiving complete materials, it can be determined which hardness model among 1310-1340 should be prioritized for testing, or whether to choose other mold silicone or polyurethane mold glue routes.


Common misunderstandings


10:1 can be approximately matched by volume ratio
The product ratio is 10:1 by weight, approximating by volume ratio may lead to a deviation in the ratio, affecting the complete curing and transparency, and it is necessary to accurately weigh by weight.


Natural exhaust after mixing is sufficient
The product is a high-viscosity mold glue, especially 1330