One cannot simply rely on the data of the product's benzene-based silicone rubber 2660 regarding its temperature resistance up to 350°C or its radiation resistance properties to directly determine that it is suitable for all sealing and functional components in high-temperature and high-radiation environments. One must first confirm the usage temperature, radiation dose, curing system, molding process, hardness requirements, and medium contact conditions, and then determine whether the problem arises from insufficient benzene content in the raw material, insufficient curing, or poor compatibility with fillers and the substrate. Product benzene-based silicone rubber 2660 can be considered as a candidate for high-temperature and radiation-resistant silicone rubber, but it must be confirmed through small-scale tests, curing verification, and actual working condition assessment.


Why does benzene-based silicone rubber often fail to achieve the expected results in high-temperature and radiation sealing?


The benzene content of the raw material does not match the target temperature and radiation resistance grade, resulting in rapid property degradation under long-term high temperatures.


The type or dosage of the curing agent is inappropriate, and the bis-dioctyl, bis-dioctyl, and platinum curing systems have a significant impact on the crosslink density and heat resistance.


Insufficient one-stage curing temperature or time, and insufficient two-stage curing, leading to an incomplete crosslink network and a large amount of compressive permanent deformation.


The compatibility of the filler system with the benzene-based raw material is poor, affecting the mechanical strength and radiation resistance performance.


The radiation dose or dose rate exceeds the verification range, while the material can withstand high temperatures but has insufficient radiation resistance.


The molding process (compression molding, injection molding, extrusion) parameters do not match, resulting in internal air holes or defects in the product, reducing the sealing reliability.


The presence of oil, solvents, or chemical media in the usage environment causes swelling or degradation of the benzene-based silicone rubber.


The hardness selection of the product is inappropriate, and high-hardness sealing components are prone to losing elasticity under low temperatures or vibration conditions.


When switching from ordinary methyl vinyl silicone rubber, the curing system, fillers, and molding process are not adjusted, resulting in performance deviations from the target.


Improper storage conditions, such as moisture absorption or expiration of the mixed rubber, affect the curing quality and consistency of the product.


What are the public parameters of product benzene-based silicone rubber 2660?


Item Before one-stage curing After two-stage curing (200°C × 2h)
Shore A hardness 59 65
Tensile strength (MPa) 12 11
Break elongation (%) 390 350
Tear strength (kN/m) 20 20
Radiation resistance: In a radiation environment of 10 to the power of 3 to 4 times kilogray gamma rays, the strength is greater than 7 megapascals, and the elongation is greater than 200%.


These data are typical performance of the product and are not the factory standards. Formal procurement and batch acceptance should be based on the effective TDS, specification documents, and delivery batch COA confirmed by both parties.


What application directions does product benzene-based silicone rubber 2660 apply to?


Application direction Candidate direction Still need verification
High-temperature sealing ring Soft sealing in long-term 350°C environment Compression permanent deformation, resilience, medium compatibility
Radiation environment sealing component Resistant to gamma-ray aging, maintaining physical properties Actual dose, dose rate, cumulative aging effect
Electronic and electrical high-temperature components Molded or injection-molded sealing, gaskets Electrical insulation performance, heat resistance grade, dimensional stability
Aerospace sealing components High-temperature, radiation-resistant, ablation-resistant Low volatility, vacuum outgassing, thermal cycling stability
Military ablation components Bar stock, rod stock, gaskets Ablation rate, mechanical performance retention rate, batch consistency
Extruded pipes and profiles Continuous extrusion molding Extrusion process, curing efficiency, dimensional tolerance


What are the key differences in product selection between benzene-based silicone rubber 2660 and similar high-temperature and radiation-resistant silicone rubbers?


Comparison direction Product 2660 (benzene-based silicone rubber) Ordinary methyl vinyl silicone rubber Benzene-based silicone rubber Fluorosilicone rubber Selection boundary
Long-term heat resistance 350°C 200-250°C 250-300°C 200-250°C Select based on the highest usage temperature
Radiation resistance Order of 10^8 Gray Low Medium Medium Preferred for silicone rubber with benzopyrene structure in high radiation environments
Low-temperature flexibility General Good General Good 脆ification temperature needs to be evaluated under low-temperature conditions
Oil and solvent resistance General Poor General Excellent Select fluorosilicone rubber in contact with oil-based media
Mechanical strength Medium Medium Medium High Choose based on sealing pressure
Sulfurization system Bis-24， Bis-25， Platinum Bis-24， Bis-25， Platinum Bis-24， Bis-25， Platinum Bis-25， Platinum Choose based on molding process
Cost High Low Medium High Need to evaluate performance and cost comprehensively
Why is it necessary to conduct complete tests for compatibility with fillers and sulfurization systems?


According to Aijota's public information， product benzopyrene silicone rubber 2660 is used for sealing and other functional components in high-temperature and high-radiation environments， which can be molded， injected， or extruded and applied in electronic appliances， aviation， aerospace， military， and other fields. However， when used in actual systems， there may still be：


Variations in phenyl content and molecular weight between rubber batches.


Differences in filler type， particle size， and surface treatment.


Types， dosages， and dispersion uniformity of sulfurizers.


Temperature， pressure， and time for one-stage sulfurization.


Temperature， time， and atmosphere for two-stage sulfurization.


Molding process parameters and mold design.


Hardness， size， and compression ratio requirements of the product.


Radiation dose， temperature cycling， and medium contact in the usage environment.


Storage conditions and the validity period of the mixed rubber.


Special requirements such as low volatility， vacuum degassing， etc.


Uniform appearance or short-term performance compliance does not prove stability after long-term high-temperature， radiation accumulation， or immersion in media. Before use， verification with the complete formula and actual materials should be conducted.


Which parameters should be confirmed when using product benzopyrene silicone rubber 2660?


Parameter category Information to be confirmed
Application direction Sealing ring， gasket， pipe， rod， ablation-resistant components
Operating temperature Long-term temperature， peak temperature， temperature cycling
Radiation environment Gamma ray dose， dose rate， cumulative dose
Hardness requirements Ray-A hardness range， compression ratio， resilience
Sulfurization system Bis-24， Bis-25， Platinum type and dosage
Molding process Mold pressing， injection， extrusion parameters
One-stage sulfurization Temperature， time， pressure
Two-stage sulfurization Temperature， time， atmosphere
Medium contact Oil， solvent， chemical medium， water vapor
Storage conditions Cool and dry， sealed， validity period
Acceptance indicators Hardness， tensile strength， elongation， tear strength， compression permanent deformation， radiation retention rate after radiation
What should be primarily verified when using product benzopyrene silicone rubber 2660?


Sulfurization characteristics of the mixed rubber (Mollier viscosity， scorch time， positive sulfurization time).


Hardness， tensile strength， elongation， tear strength after one-stage sulfurization and two-stage sulfurization.


Compression permanent deformation and resilience.


Mechanical property retention rate after high-temperature aging.


Strength， elongation， and hardness changes after gamma ray irradiation.


Ablation performance and thermal weight loss.


Compatibility with the contacting medium.


Product size stability and sealing reliability.


Batch consistency and repeatability.


Low volatility and vacuum degassing performance (aerospace application).


Effectiveness of safe operation conditions (ventilation， dust prevention， fire prevention).


How to design tests before using product benzopyrene silicone rubber 2660?


Establish a current silicone rubber benchmark， record model， batch， sulfurization system， molding process and failure performance.


Uniform test conditions： raw rubber， fillers， sulfurizers， one-stage sulfurization， two-stage sulfurization， molding process.


Set candidate samples： current silicone rubber， product 2660， different hardness or sulfurization system gradients.


Complete the entire process testing： mixing → molding → one-stage sulfurization → two-stage sulfurization → performance testing → irradiation testing.


Evaluation of actual results: hardness, strength, elongation, tear strength, compression permanent deformation, radiation resistance retention rate.


Test items Uniform requirements
Raw rubber and fillers Consistent
Sulfurizing agent type and dosage Set gradients according to the test design
One-stage sulfurization conditions Set gradients according to the test design
Two-stage sulfurization conditions Set gradients according to the test design
Molding process Consistent
Measurement methods Hardness, strength, elongation, tear strength, compression permanent deformation are consistent
Which situations are not suitable for directly using product benzoyl silicone rubber 2660?


If the operating temperature exceeds 350℃ for a long time, the thermal aging life has not been evaluated.


If the radiation dose exceeds the verified range, the cumulative dose assessment has not been conducted.


If it comes into contact with oils, solvents or strong chemical media, the medium resistance performance has not been evaluated.


If specific food contact, medical or other industry approvals are required, but corresponding materials have not been obtained yet.


If there are strict requirements for low volatility and vacuum exhaust, but no special verification has been conducted.


Only the operating temperature is known, but the radiation dose, medium and molding process data are not available.


The customer requests to directly mix it into the in-use system, but the curing system and fillers cannot be controlled.


When switching from ordinary silicone rubber, the curing process and molding parameters have not been re-adjusted.


The storage conditions of the mixed rubber do not meet the requirements of cool and dry, sealed, and may absorb moisture or expire.


The hardness or compression ratio requirements of the products deviate significantly from the typical data of the product, and the formula adjustment verification has not been conducted.


When used in aerospace or military fields, the batch consistency and reliability of the product have not been evaluated.


The operating environment has poor ventilation or insufficient fire protection measures, and the decomposition products of the sulfurizing agent may affect health.


What selection support can Aytota provide?


As a "provider of the organic silicon全产业链 solutions"， Aytota can assist in comparing the applicability of benzoyl silicone rubber 2660 in different operating temperatures， radiation doses， curing systems and molding processes.


For electronic electrical， aerospace， military or medical projects that need to balance high temperature resistance， radiation resistance， ablation resistance and sealing reliability， the following information should be provided before selection：


Operating temperature range and temperature cycling conditions.


Gamma radiation dose， dose rate and cumulative dose.


Hardness and compression ratio requirements.


Curing system and molding process.


One-stage and two-stage curing conditions.


Type and concentration of contact media.


Target mechanical properties， radiation resistance retention rate and sealing reliability.


Current silicone rubber model， curing system and failure performance.


After receiving complete materials， it can be determined whether to prioritize testing product 2660， or choose benzyl silicone rubber， fluorosilicone rubber or other high-temperature and radiation-resistant elastomers routes.


Common misunderstandings


350℃ of temperature can be used for a long time at 350℃
The long-term operating temperature needs to be comprehensively evaluated considering the thermal aging life， compression permanent deformation and medium environment， and cannot be judged solely based on short-term temperature resistance data.


Radiation data can cover all radiation environments
Radiation performance is related to dose， dose rate and cumulative time， and needs to be verified under actual radiation conditions.


Product 2660 can be freely interchanged with ordinary methyl vinyl silicone rubber
The benzyl content， high-temperature and radiation resistance performance and cost of benzoyl silicone rubber are significantly different from ordinary silicone rubber， and the curing system， fillers and molding process need to be re-adjusted when replacing.


The more sulfurizing agents added， the more fully cross-linked
Excessive sulfurizing agents may lead to excessive cross-linking， brittle products or bubble formation， and the optimal dosage needs to be determined through small-scale tests.


The final performance can be achieved after one-stage curing
Two-stage curing is crucial for the completion of the cross-linking network and the removal of volatile substances， and should be carried out according to the recommended conditions.


Compatibility with the substrate means it can be directly added to the in-use system
It is still necessary to confirm the fillers， sulfurizing agents， molding conditions and long-term stability.
Silicone rubbers with different levels of phenyl content may have different temperature resistance, radiation resistance and low-temperature performance.


Product 2660 can be used in all high-radiation environments.
Phenyl silicone rubber has excellent radiation resistance, but the specific dose range needs to be verified based on actual working conditions.


Molded rubber can be stored for a long time.
Molded rubber has an expiration date limit. Improper storage conditions may cause scorching or performance degradation. It should be used within the expiration period.


Recommended selection steps


Confirm the application direction: high-temperature sealing, radiation environment sealing, ablation-resistant components or extruded pipe materials.


Confirm the use temperature, radiation dose, medium contact and temperature cycling conditions.


Confirm the hardness, compression ratio and size requirements of the product.


Confirm the curing system (dibutyl, dibutyl, platinum) and molding process.


Confirm the conditions for one-stage curing and two-stage curing.


Based on the application scenario, select Product 2660 or other high-temperature and radiation-resistant silicone rubbers.


Set up different curing agent dosages and curing conditions gradients for small-scale tests.


Test hardness, strength, elongation, tear strength and compression permanent deformation.


Perform high-temperature aging, gamma ray irradiation and medium immersion verification.


Evaluate the sealing reliability and batch consistency of the product.


After completing multiple batch verifications, determine the final usage plan.