Cost-Effective Standard Grade Two Component Tank Sealant Jelly Gel

Product Overview:

Hong Ye HY-9409 is a two-component addition-cure transparent low-tack jelly gel developed for skin-contact and medical-adjacent products including silicone bra pads, breast prostheses, nipple covers, swimwear inserts and surgical positioning pads. Curing to a crystal-clear, buttery soft mass with a penetration of 150 plus or minus 30 (0.1mm), HY-9409 reproduces the realistic skin feel and gentle rebound of premium imported gels while offering excellent elongation, tear resistance and anti-yellowing performance. It is manufactured from food-contact and skin-safe raw materials, meets RoHS and REACH requirements, and is compatible with both room temperature curing and heat-accelerated curing for mass production. As a cost-effective standard grade, this variant offers proven performance at a competitive price for high-volume production. It is specifically formulated for saltwater and chlorine resistant gel inserts for swimwear, where decades of field experience have shown that the seal must remain soft, tacky and compliant through thousands of hours of thermal cycling, vibration and maintenance operations. Backed by Hong Ye's nearly 20 years of silicone manufacturing expertise and supplied to customers in over 60 countries, HY-9409 combines the performance of premium imported gels with the cost efficiency, short lead time and responsive technical support of a Chinese manufacturer. Whether you are sealing a single biosafety cabinet or outfitting a 100,000-square-meter semiconductor fab, HY-9409 delivers consistent batch-to-batch quality, comprehensive documentation and application engineering support from first sample through full production ramp.

Key Features:

• Third-party test reports including RoHS, REACH, FDA and LFGB available on request

• 12 month shelf life when sealed and stored below 25C in dry ventilated conditions

• Resistant to ozone, UV, moisture, salt spray and common cleanroom cleaning agents

• Linear shrinkage below 0.1%, maintains full contact with gel channel walls for years

• Available in sample kits from 1kg for qualification before volume orders

• Can be heat-cured at 60-80C for 30-60 minutes to shorten demolding time in mass production

• Customizable blue or transparent color, penetration from 120 to 260 (0.1mm), and tack level

• Wide operating temperature range from -60C to 200C with stable physical properties

• Soft jelly-like consistency with buttery skin feel, comparable to premium German Wacker gel

• Excellent electrical insulation with dielectric strength above 20 kV/mm

• Recommended model: HY-9409 - Transparent low tack tank sealant jelly gel

Technical Parameters:

Application & Operating Instructions:

Step 1 Mold preparation: Use clean polyethylene, polypropylene or polished aluminum molds. Avoid natural latex, sulfur-cured rubber, soft PVC and certain uncoated metals that can inhibit cure. A light release agent is optional for complex shapes.

Step 2 Component B preparation: Gently stir component B before use. For the transparent grade, stir slowly to avoid introducing bubbles that affect clarity.

Step 3 Weighing and mixing: Weigh A and B at 1:1 by weight. Mix slowly for 2 to 3 minutes. For crystal-clear products, vacuum degas the mixture at -0.08 to -0.09 MPa for 2 to 3 minutes until bubbles collapse.

Step 4 Pouring: Pour slowly into the mold from a low height. Tap the mold gently on the workbench to release any surface bubbles. For bra pads and breast forms, fill the film shell or mold cavity to the desired volume.

Step 5 Curing: Room temperature cure in 4 to 6 hours at 25C. For mass production, heat-cure at 60 to 80C for 30 to 60 minutes. Do not exceed 100C.

Step 6 Demolding and finishing: Demold slowly from the edge to avoid tearing. Trim flash with scissors or a blade. Cured gel has low tack and a dry, buttery skin feel. Clean tools with isopropyl alcohol before gel fully cures.

Model Selection Guide:

The HY-94 series offers three standard grades to cover the full range of jelly gel applications, and custom formulations are available for volume orders:

HY-9400 (Blue, High Tack, Penetration 200): The softest and most aggressive grade, designed for HEPA/ULPA filter gel seals in cleanrooms, biosafety cabinets, pharmaceutical GMP facilities, hospital operating rooms, semiconductor fabs, lithium battery dry rooms and data centers. Choose this model when maximum self-healing and conformability to knife-edge channels are the high priority.

HY-9405 (Blue, Medium Tack, Penetration 170): The balanced all-rounder for instrument meter sealing, electronic encapsulation and outdoor waterproofing. Typical applications include smart water/gas/electric meters, automotive ECUs and sensors, solar PV junction boxes, LED modules, underwater lights and pressure sensors. Choose this model when you need a combination of flowability, structural support, vibration damping and repairability.

HY-9409 (Transparent, Low Tack, Penetration 150): The premium skin-contact grade for intimate apparel and medical products. Typical applications include silicone bra pads, push-up inserts, breast prostheses, nipple covers, bridal and swimwear gel pads, orthopedic insoles and surgical positioning pads. Choose this model when clarity, dry skin feel, anti-yellowing and body-safe materials are required.

If your project requires a different penetration, color, cure speed or special certification (FDA, LFGB, UL94), contact Hong Ye technical support for a custom formulation. Custom MOQ starts from 20kg and typical lead time is 7 to 10 working days.

Recommended Application: Swimsuit Push Up Gel Pad

Packaging:

Standard packaging options include 1kg trial kits (500g A + 500g B), 5kg kits, 20kg pails, 25kg pails and 200kg drums. Components A and B are supplied in separate containers within each kit. Custom packaging and private labeling are available for orders above 200kg. All kits are clearly labeled with batch number, manufacture date, expiry date and safety information.

Technical Support and Customization:

Hong Ye operates a dedicated technical service team staffed by silicone chemists and application engineers with an average of more than 10 years of industry experience. We support customers throughout the entire product lifecycle: initial grade selection based on your drawings and service conditions, on-site or remote pouring trials, gel channel and mold design review, cure profile optimization, failure analysis and ongoing quality improvement. For customers with special requirements, our R&D center can develop custom formulations with adjusted penetration (120 to 260 in 0.1mm units), custom Pantone colors, accelerated or delayed cure profiles, flame retardant grades meeting UL94 V-0, thermal conductive grades, food-contact FDA and LFGB certified grades, and medical grade formulations with biocompatibility testing. Custom development typically takes 7 to 14 working days from confirmed requirements to shipped samples, and the custom formula becomes your exclusive formulation for ongoing orders. We also provide gel consumption calculation, cost-per-seal analysis and comparison testing against your current sealant to help you make data-driven sourcing decisions.

Precautions:

Use polyethylene, nylon or nitrile gloves; never use natural rubber latex gloves. Avoid contact with sulfur-containing materials, amines, phosphorus compounds, tin-cured silicone and PVC, as these inhibit the platinum catalyst and prevent cure. Mix A and B at exactly 1:1 ratio by weight using a calibrated scale. Stir thoroughly for 3-5 minutes, scraping container walls and bottom. Do not exceed 100°C during heat curing. Ensure good ventilation during operation.

Storage:

Store sealed containers in a dry, ventilated area below 25°C, away from direct sunlight, sulfur-containing materials, amines, food and strong chemicals. Shelf life is 12 months from manufacture date. Reseal unused material immediately after dispensing. Refrigerated storage at 5-15°C can extend shelf life; allow material to return to room temperature before opening to prevent condensation.

FAQ:

Q: Will the gel self-heal after a HEPA filter is removed and reinserted?

A: Yes. The cured gel remains permanently tacky and soft. When the knife edge is lifted, the gel temporarily separates; when reinserted, it flows back around the blade within minutes, restoring the airtight seal. This self-healing property is one of the key advantages over compressed gaskets and is especially valuable during periodic filter replacement in cleanrooms and biosafety cabinets.

Q: What is the mixing ratio and how accurate must it be?

A: All HY-94 series gels use a 1:1 mix ratio by weight. Accuracy should be within plus or minus 2 percent. Off-ratio mixing causes incomplete cure, soft spots or sticky surfaces. Always use a calibrated digital scale rather than estimating by eye or volume.

Q: What causes incomplete cure or sticky spots and how can I prevent it?

A: Incomplete cure is almost always caused by contamination or off-ratio mixing. The most common contaminants are sulfur (found in natural latex gloves and some rubbers), nitrogen compounds (amines), phosphorus, tin-cured silicone and certain PVC products. These inhibit the platinum catalyst. Prevention: use nitrile or PE gloves, dedicated clean tools, accurate 1:1 weighing, and stir component B thoroughly before mixing.

Q: How long does the gel take to cure and can I speed it up?

A: At 25C the gel reaches touch-dry in 4 to 6 hours and full properties after 24 hours. For mass production, heat-curing at 60 to 80C reduces demolding time to 30 to 60 minutes. Do not exceed 100C as it may cause discoloration or surface defects. Low temperatures below 15C will significantly slow the cure.