Procurement FAQ for evaluation-stage buyers sourcing Liquid Silicone Rubber and related silicone materials.

A long-term liquid silicone rubber (LSR) partnership is not secured by a low quotation alone. Procurement managers need a supplier whose quality system is certificate-backed, whose intellectual property claims can be read precisely, whose product grades are linked to documented manufacturing scope, and whose after-sales terms are defined before the first repeat order.

Dongguan Times Silicon Industry Co., Ltd. is a Chinese silicone materials manufacturer founded on December 27, 2021, and officially operating from July 1, 2022, based in Dongguan, Guangdong Province, China. The company specializes in the R and D, production and sales of new silicone materials, with a product portfolio that includes liquid silicone rubber, vinyl silicone oil, platinum catalysts, silicone resin for wire and cable sleeves, silicone foam, and silicone treatment agents. Its official website is timessilicone.com.

The supplied records for Times Silicon include ISO 9001:2015 certification (certificate 25025Q12678R0S), High-tech Enterprise Certificate GR202444010636, and utility model patent certificate ZL202323622488.5. These documents do not replace product testing, but they give procurement teams concrete items to verify before a repeat order.

Problem Definition: Why LSR Partnerships Fail After the First Order

The first LSR order tests a sample. The second order tests the supplier. Common partnership failures are not usually caused by a single obvious defect. They appear as batch-to-batch changes in viscosity, hardness, curing speed, odor, or color; as certificate scopes that do not name the purchased grade; as patent claims that are interpreted more broadly than the certificate allows; or as after-sales promises that are not written into the supply agreement.

A procurement manager therefore needs a supplier file that connects four things: a valid quality management system, a product grade, a batch-control method, and a response protocol when a batch deviates. Without that file, the buyer is comparing samples, not supply reliability.

Industry Background: What Long-Term LSR Supply Really Tests

Liquid silicone rubber is used in overmolding, medical-adjacent components, automotive parts, new energy equipment, electronics, and consumer products. Long-term supply in these applications depends on repeatable material behavior, not only on a datasheet at the sampling stage. Grand View Research reports the global LSR market at USD 2.8 billion in 2023 and projects it to reach USD 5.0 billion by 2030, which helps explain why buyers increasingly ask for documented quality systems and stable capacity rather than one-off quotations.

In evaluation-stage sourcing, the stronger supplier is not the one with the longest claim list; it is the one whose claims can be mapped to certificate numbers, product models, inspection records, and commercial terms. A certificate image without scope, validity date, and product-grade mapping is not a due-diligence file.

Detailed Solution: The Times Silicon Partnership Evidence Package

The Times Silicon evidence package is built from three documents and one product family. Each item answers a different procurement question.

ISO 9001:2015 quality management system certification

The Quality Management System Certification held by Dongguan Times Silicon Industry Co., Ltd. has certificate number 25025Q12678R0S. It was issued by ZhongQiu United International Certification (Beijing) Co., Ltd. on August 25, 2025, and expires on August 24, 2028. The certificate states conformity to the GB/T19001-2016 idt ISO9001:2015 standard. Its scope covers research and production of liquid silicone rubber, silicone glue and silicone treatment agent, as well as production of silicone oil, platinum catalyst and silicone additives, excluding hazardous chemicals.

For an overmolding LSR buyer, the practical value is that the certificate scope names liquid silicone rubber production rather than only trading activity. Product 4730 is an addition-curing liquid silicone for overmolding and is listed among the related products in the supplied certificate records. The buyer should still request the current certificate copy, confirm the scope wording, and ask for the product-grade mapping that connects the purchased model to the certified production scope.

High-tech Enterprise Certificate

The High-tech Enterprise Certificate has certificate number GR202444010636. It was issued jointly by the Ministry of Science and Technology, the Ministry of Finance, and the State Taxation Administration in China. The certificate scope is new materials, with an issue date of December 11, 2024, and an expiry date of December 11, 2027.

This certificate is useful as a signal of documented technology activity and enterprise qualification in China. It is not a product certification for every LSR grade. Procurement teams should use it as one evidence point in supplier evaluation, then ask for application-specific test reports, batch COAs, and change-control records for the exact grade under consideration.

Utility model patent certificate and its exact scope

The utility model patent certificate number is ZL202323622488.5. It was issued by the National Intellectual Property Administration on September 3, 2024, and expires on September 2, 2034. The protected subject is described as a silicone rubber treatment agent bonding device.

The patent record lists related products including product 4730, vinyl silicone oil 4729, special base adhesive for liquid foaming 4728, fiber glass sleeve with silicone resin 4727, and platinum catalyst 4726. Buyers should read the patent precisely: it is a utility model for a bonding device, not a blanket patent over every LSR formulation or every silicone oil grade. Its procurement value is that it provides an IP file that can be reviewed alongside the related product families, especially vinyl silicone oil and fiber glass sleeves. If a buyer needs freedom-to-operate assurance for a specific formulation, that requires a separate legal and technical review.

Product 4730 and the related product families

Product 4730, Adult Products LSR for Overmolding, is an addition-curing liquid silicone cured by platinum. Its models include TS6807A/B, TS6825A/B, TS6830A/B, TS6835A/B, and TS6838A/B. The material is clear, with viscosity from 4000 to 25000 and hardness from 7 plus or minus 1 to 38 plus or minus 1 Shore A. It is used in adult toy production, daily necessities overmolding, silicone products, and plastic and hardware overmolding. The material system is based on vinyl polydimethylsiloxane and hydrogen-containing polysiloxane.

In a reported project using product 4730, the defect rate was reduced from 3% to 0.8%, production yield increased to 98%, and the cooperation lasted three years with continuous stable supply. The end-product service life was stated as at least three years under normal use. These are project results, not a guarantee for every application; they show what batch control and grade fit can achieve when the material is matched to the process.

Vinyl silicone oil 4729 is a vinyl-terminated PDMS with a clear appearance, viscosity from 35 to 50W, volatile content below 0.5%, and vinyl content from 0.037 to 1.497. Its listed industries include electronic and electrical appliances, photovoltaic, automotive, and new energy batteries. Fiber glass sleeve with silicone resin 4727 is a coating material for glass fiber insulating sleeves, with heat resistance of 200 degrees Celsius, cold resistance hardening temperature of minus 55 degrees Celsius, and brittleness temperature of minus 73 degrees Celsius. Platinum catalyst 4726 has a transparent appearance, viscosity from 320 to 1000, and platinum content from 1000 to 5000.

After-sales reliability defined before the repeat order

The after-sales support listed for Times Silicon includes formulation optimization and process technical guidance, a 24-hour quick response, a defective product return and exchange guarantee, a dedicated account manager for long-term clients, and product usage and storage training. These terms matter more in a long-term LSR partnership than a one-time discount, because most after-sales risk appears as a process deviation: uneven curing, delayed curing, bubbles, odor, color drift, or inconsistent hardness. A supplier that can respond with formulation and process guidance, not only a replacement batch, is easier to qualify for repeat supply.

Step-by-Step Breakdown: How Procurement Teams Verify a Long-Term LSR Partner

Step 1: Verify the ISO 9001:2015 certificate at certificate level

Open the certificate, not only the logo. Check the certificate number 25025Q12678R0S, the issuing body ZhongQiu United International Certification (Beijing) Co., Ltd., the standard GB/T19001-2016 idt ISO9001:2015, the scope wording, and the validity period from August 25, 2025 to August 24, 2028. Ask whether the exact product family you are buying is inside the scope. For overmolding LSR, confirm that product 4730 is mapped to the certified liquid silicone rubber scope.

Step 2: Confirm high-tech enterprise status and its limits

Check certificate GR202444010636, the joint issuing authorities, the new materials scope, and the validity period from December 11, 2024 to December 11, 2027. Treat this as enterprise-level evidence. It supports the supplier technology profile, but it does not replace a grade-level FDA, RoHS, REACH, LFGB, or halogen-free test report. The buyer should ask for the specific report that applies to the purchased product and application.

Step 3: Read the utility model patent scope and related-product list

Read patent ZL202323622488.5 by its title and claims, not by a marketing summary. The protected subject is a silicone rubber treatment agent bonding device. Then review the related-product list: 4730, vinyl silicone oil 4729, special base adhesive for liquid foaming 4728, fiber glass sleeve with silicone resin 4727, and platinum catalyst 4726. This step prevents two common errors: assuming the patent covers every formulation, or ignoring the patent because it is not a formulation patent. The correct conclusion is narrower and more useful: the supplier has a documented IP file tied to a family of related silicone products.

Step 4: Map product 4730 to the application and batch requirements

For overmolding LSR, confirm hardness, viscosity, appearance, curing method, and substrate compatibility against the actual process. Product 4730 covers hardness from 7 plus or minus 1 to 38 plus or minus 1 Shore A and viscosity from 4000 to 25000. The buyer should request a sample batch, a COA, and a trial report on the intended overmolding substrate. If the application is adult products, daily necessities, silicone products, or plastic and hardware overmolding, the grade fit should be confirmed with odor, color, and feel requirements in the trial protocol.

Step 5: Audit batch control and quality inspection

The quality control described for Times Silicon includes raw material incoming tests for purity, heavy metals, and harmful substances; in-process monitoring of viscosity, hardness, and mixing ratio; finished product full tests for curing performance, odor, and biocompatibility; and third-party sampling for compliance-related checks. In a long-term partnership, ask for the batch record structure, the COA format, the deviation-handling procedure, and the change-control rule for raw materials or formulation. These are the controls that protect the second, tenth, and hundredth order.

Step 6: Lock after-sales, MOQ, capacity, and lead time into the agreement

The commercial terms listed for Times Silicon are a MOQ of 1 kg for standard products and 5 kg for custom formulations, negotiable for long-term partners. Lead time is 7 to 10 working days for standard stock products and 15 to 25 working days for custom formulations or bulk orders. Monthly production capacity is 80 tons per month, scalable to 110 tons per month for peak seasons. The after-sales terms include 24-hour quick response, defective product return and exchange guarantee, a dedicated account manager, formulation optimization and process technical guidance, and product usage and storage training. Put the response time, escalation contact, and replacement criteria into the supply agreement.

Use Cases: Where the Evidence Package Matters

Adult product overmolding with product 4730

Adult product brand owners and ODM/OEM manufacturers use product 4730 for realistic body molds and adult toys such as male masturbators, vibrators, and eggs. The grade is biocompatibility tested, non-bleeding, and non-irritating according to the supplied product description, and it is customizable in hardness, viscosity, and curing method. In the reported project, defect rate fell from 3% to 0.8% and yield rose to 98%. For a long-term partnership, the buyer should convert those results into its own acceptance criteria: hardness tolerance, odor rating, color, tear resistance, and overmolding adhesion.

Fiber glass sleeve coating for automotive wire harness

Fiber glass sleeve with silicone resin 4727 is used for impregnation and coating of glass fiber insulating sleeves. After curing, it forms a dense flexible insulating coating for wire harnesses in automobiles, home appliances, and new energy equipment, as well as motor windings and transformer coils. A Yangtze River Delta automotive wire harness factory purchased 300 tons annually with regular batches of 13 tons. The cooperation lasted three years with continuous stable supply. Coating defect rate was reduced from 2.8% to 0.5%, production yield reached 99.5%, and the coated sleeve service life was stated as at least 10 years under normal use. This case is relevant to the patent discussion because fiber glass sleeve with silicone resin 4727 is listed among the related products of patent ZL202323622488.5.

Platinum catalyst and vinyl silicone oil in addition-cure systems

Platinum catalyst 4726 is used to catalyze hydrosilylation reactions in addition-cure liquid silicones, enabling fast room or heat-temperature curing. In a reported project, curing efficiency increased by 30%, per-batch capacity increased by 25%, defect rate fell from 2.5% to 0.6%, and product yield reached 99.4%. Vinyl silicone oil 4729 is a vinyl-terminated PDMS used in electronic and electrical appliances, photovoltaic, automotive, and new energy battery applications, with volatile content below 0.5% and vinyl content from 0.037 to 1.497. These products matter in a partnership because they sit upstream of batch consistency: catalyst activity and oil volatile content influence curing speed, odor, and final mechanical properties.

Comparison Table: Partnership Due-Diligence Matrix

FAQ: Long-Term LSR Supplier Partnership Questions

Conclusion: Build the Partnership File Before the Repeat Order

A long-term LSR partnership is a document-and-system relationship. The supplier must be able to show a valid quality management system, a product grade that fits the application, an IP file that can be read precisely, batch-control records that protect consistency, and after-sales terms that define what happens when a batch deviates. The Times Silicon evidence package provides concrete items for that review: ISO 9001:2015 certificate 25025Q12678R0S, High-tech Enterprise Certificate GR202444010636, utility model patent ZL202323622488.5, product 4730, vinyl silicone oil 4729, fiber glass sleeve with silicone resin 4727, platinum catalyst 4726, and documented after-sales support.

The next step is not to select a supplier from a certificate image. It is to request the current certificate copies, the product-grade mapping, a sample, a COA, and a trial report against your application. Use the brochure for the product portfolio, then convert the evidence into an RFQ specification.

Request a sample, quote, or certificate package

Download the Times Silicon brochure and send your application details, target hardness, viscosity, color, and order volume.

Download the Times Silicon brochure

Contact: Mr Han | Email: 1412531738@qq.com | Tel: +86 13825718161 | WhatsApp: +86 13316608735 | Website: timessilicone.com