Food Grade Liquid Silicone Baby Bottle Sealing Ring Leak-proof

# Food Grade Liquid Silicone Baby Bottle Sealing Ring Leak-proof

Product Overview

The Food Grade Liquid Silicone Baby Bottle Sealing Ring is a precision-engineered sealing component manufactured via medical-grade liquid silicone rubber (LSR) injection molding, designed exclusively to eliminate leakage risks for standard and wide-neck baby feeding bottles. As a critical contact part between the bottle body, nipple collar, and nipple, this product combines food-safe material formulation, high elasticity, and dimensional accuracy to provide long-lasting, reliable sealing performance for daily infant feeding scenarios, including storage, travel, and warm water bath heating.

Unlike traditional rubber or general silicone seals, this product adopts a food-contact-specific LSR formulation that is free of BPA, phthalates, PVC, polycarbonate, and harmful plasticizers, fully complying with global infant product safety regulations. Its optimized cross-sectional structure features a 0.3mm micro-convex sealing lip that fits tightly to the bottle thread gap, effectively preventing milk, formula, or water from spilling even when the bottle is inverted, shaken vigorously, or placed in a diaper bag. The material’s inherent low compression set property ensures the seal maintains its original shape after thousands of assembly, disassembly, and sterilization cycles, avoiding common failure points such as hardening, deformation, or gap formation that lead to leaks.

Technical Specifications

Material Properties

Physical Performance

Process Parameters

Product Advantages

1. Ultra-high Food Safety Compliance for Infant Contact

This sealing ring is formulated with medical-grade LSR raw materials sourced from globally recognized suppliers, with no added fillers, colorants, or odorous additives. It has passed the most stringent infant product safety tests globally, including FDA 21 CFR 177.2600 food contact certification, EU EN 14350 child drinking equipment standard, and China GB 4806.11 food contact silicone standard. It does not release harmful substances even when soaked in high-temperature milk, acidic juice, or warm sterilization solutions for a long time, eliminating potential safety hazards for infants with sensitive constitutions.

2. Long-lasting Leak-proof Performance

The optimized double-lip sealing structure and high elasticity LSR material allow the ring to automatically adapt to minor dimensional deviations of bottle threads and nipple collars caused by long-term use. Its compression set of less than 8% is 30% lower than that of ordinary silicone seals, ensuring it remains tightly fitted after 1000+ sterilization cycles, without deformation or permanent compression that would create leakage gaps. It maintains zero leakage even when the bottle is inverted for 72 hours, shaken at 100 times per minute for 30 minutes, or stored in a 40°C high-temperature environment for 7 days, making it ideal for travel and outdoor use.

3. Extreme Temperature Adaptability for All Sterilization Methods

The product can withstand temperatures from -60°C to 220°C, fully adapting to all common infant product sterilization methods: boiling water sterilization (100°C), high-pressure steam sterilization (121°C), microwave sterilization (180°C short-term), UV sterilization, and low-temperature refrigerated storage of breast milk (-20°C). It does not harden, become brittle, or deform after repeated temperature changes, and its material properties remain stable without cracking or discoloration, extending its service life to 2-3 times that of ordinary rubber seals.

4. Easy Cleaning and Anti-microbial Adhesion

The LSR material’s inherently low surface energy and smooth Ra ≤ 0.2 μm polished surface reduce the adhesion of milk fat, protein, and formula residue. The ring can be easily cleaned with warm soapy water, and is fully compatible with dishwasher top-rack cleaning, with no residue remaining in gaps. The material formula also includes a food-safe anti-microbial additive that inhibits the growth of E. coli and Staphylococcus aureus by 99.9% (tested according to ISO 22196), reducing the risk of oral bacterial infection in infants.

Applications

This sealing ring is widely used in infant feeding product scenarios, with primary applications including:

1. Standard and wide-neck baby feeding bottles: Compatible with most mainstream bottle brands on the market, suitable for PP, PPSU, glass, and Tritan bottle bodies, providing sealing between the bottle body and nipple collar.
2. Breast milk storage bottles: When used with sealed lids, it prevents breast milk leakage during refrigeration or frozen storage, and maintains the freshness of breast milk by isolating external air and bacteria.
3. Infant sippy cups and water bottles: Used for the sealing of transition sippy cups and portable children’s water bottles, avoiding water spillage during children’s activities or outdoor outings.
4. Infant food storage containers: Seals small food jars for storing complementary foods such as fruit puree and rice cereal, preventing leakage and oxidation of food during storage and transportation.

Application note: Before first use, boil the sealing ring in boiling water for 3-5 minutes to remove surface dust and residual processing additives; after each use, remove it from the bottle collar for separate cleaning to avoid milk residue accumulating in the fitting gap; replace the sealing ring immediately if there are visible cracks, deformation, discoloration, or reduced elasticity, with a recommended replacement cycle of 2-3 months for daily use.

Selection Guide

Hardness Selection

• 35-40 Shore A: Recommended for glass bottles and frequent sterilization scenarios. Its softer texture provides better fit for glass bottle threads with higher dimensional accuracy, and maintains sufficient elasticity after repeated high-temperature sterilization.
• 40-45 Shore A: Recommended for PPSU, PP, and Tritan plastic bottles. Its moderate hardness adapts to minor dimensional changes of plastic bottle bodies after long-term use, and has better wear resistance for frequent assembly and disassembly.

Size Specifications

*Custom sizes are available for specific bottle thread designs, with a minimum order quantity of 10,000 pieces per specification.*

Material Grade

• Regular Food Grade: Meets basic FDA and EU food contact standards, suitable for ordinary daily feeding scenarios, cost-effective for mass production of mid-range bottle products.
• Medical Grade: Passes ISO 10993 biocompatibility testing, no cytotoxicity and no skin irritation, suitable for premature infants, infants with sensitive constitutions, and high-end infant product lines.
• Anti-bacterial Grade: Added with food-safe silver ion anti-bacterial agents, with 99.9% anti-bacterial rate against common bacteria, suitable for public scenarios, travel, and users with high hygiene requirements.

Quality Assurance

We implement a full-process quality control system from raw material incoming inspection to finished product delivery:

1. Raw Material Control: Each batch of LSR raw materials is tested for composition, hardness, and heavy metal content before entering the warehouse, and traceability records are kept for each batch to ensure compliance with food safety requirements.
2. In-process Inspection: Each production line is equipped with 2 full-time inspectors, who carry out dimensional measurement, sealing performance testing, and visual inspection every 30 minutes, and immediately adjust process parameters if unqualified products are found.
3. Finished Product Testing: Each batch of finished products undergoes random sampling for full performance testing, including high-temperature aging test, sterilization cycle test, leakage test, and food contact safety test, and can be shipped only after passing all tests.
4. Certification System: Our production workshop meets ISO 13485 medical device quality management system standards, and the product has obtained FDA food contact certification, EU CE certification, RoHS certification, and China GB food safety certification, which can meet the market access requirements of all major countries and regions in the world.

We provide a 3-month quality warranty for all products: if there are quality problems such as non-human-induced deformation, cracking, or leakage within the warranty period, we will provide free replacement or refund services. We also support customized material formulation, size, and packaging services according to customer needs, and can provide corresponding test reports and certification documents as required.