LSR Waterproof Seal Ring For Facial Cleanser

As a specialized manufacturer of liquid silicone rubber (LSR) products, we focus on producing consistent, high-quality seals tailored to the compact geometry of modern facial cleansers. Unlike generic rubber seals, our LSR waterproof seal rings are manufactured through injection molding, enabling tight dimensional tolerances and uniform material properties that prevent water ingress into sensitive electronic components, even after repeated exposure to tap water, facial cleansers, and warm cleansing temperatures.

This product is ideal for brands developing waterproof facial cleansing devices rated from IPX5 to IPX7, providing a cost-effective sealing solution that retains performance through thousands of use cycles.

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Technical Specifications

Material Properties

Our LSR waterproof seal rings are produced from food-contact grade platinum-cured liquid silicone rubber, with the following core material properties:

Physical Performance

Finished seal rings meet the following physical performance standards for personal care applications:

Process Parameters

All our seal rings are produced via precision LSR injection molding with controlled processing to ensure consistency:

• Molding temperature: 160°C – 180°C
• Curing time: 60 – 120 seconds (adjusted based on seal cross-section thickness)
• Dimensional tolerance: ±0.05mm for dimensions <10mm; ±0.1mm for dimensions 10 – 50mm
• Surface finish: Matte to semi-gloss, no flash or burrs after secondary trimming

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Product Advantages

1. Long-term waterproof reliability with low compression set

The addition-cured LSR material used in our seal rings has excellent compression resistance, retaining its elastic recovery properties even after prolonged compression in the facial cleanser housing. This prevents the seal from deforming or losing its sealing force over time, avoiding water leakage that would damage the device's internal battery and circuit board. Unlike cheaper peroxide-cured silicone seals, our platinum-cured LSR does not leach volatile byproducts that could cause unpleasant odors or skin irritation.

1. Skin-safe and biocompatible for personal care use

All raw materials used for our facial cleanser seal rings are selected to meet food-contact and skin safety requirements. The non-toxic, non-irritating silicone material will not cause allergic reactions when it comes into accidental contact with facial skin during use, and it does not support bacterial growth with regular cleaning. It is also resistant to discoloration from contact with common facial cleanser ingredients, maintaining a clean appearance throughout the device's service life.

1. Precision molding for compact device geometries

Modern electric facial cleansers are designed to be lightweight and handheld, requiring small, dimensionally accurate seal rings to fit into tight housing gaps. Our precision injection molding process achieves tight tolerances that eliminate gaps between the seal and device components, ensuring consistent water resistance across every production batch. We can also customize the cross-sectional shape (including O-ring, lip seal, and custom profile designs) to match your specific device design.

1. Resistance to daily use conditions

Our LSR seal rings maintain their performance through repeated exposure to warm water, facial cleansers, and mild exfoliating ingredients, with no swelling, hardening, or cracking over time. The material's stable chemical properties mean it will not degrade even with regular daily use, extending the service life of your facial cleansing device.

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Applications

Our LSR Waterproof Seal Ring for Facial Cleanser is designed specifically for sealing applications in personal care electronic devices, including:

• Electric rotating facial cleansing brushes: Sealing between the brush head rotating shaft and device housing to prevent water from entering the internal motor and circuit assembly
• Sonic vibration facial cleansers: Sealing around the device's battery compartment and side control buttons to achieve IPX6 or IPX7 waterproof ratings for full in-shower use
• Silicone pad facial cleansing devices: Edge sealing between the silicone cleansing pad and plastic housing to prevent water penetration between assembled components
• Portable travel facial cleansing devices: Sealing that maintains performance even with fluctuating ambient temperatures during transport and storage

This product can also be adapted for similar waterproof sealing requirements in other small personal care electronics, such as electric face rollers and portable skincare mist devices.

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Selection Guide

Hardness Selection

We offer a range of standard hardness options to match your device design requirements:

• 30 – 35 Shore A: Best for applications requiring high conformability to irregular housing surfaces, ideal for low-torque rotating shafts where low friction is required
• 40 – 45 Shore A: General-purpose hardness for most sonic and rotating facial cleansers, balancing conformability and compression resistance for long-term use
• 50 Shore A: Recommended for applications requiring higher structural support and resistance to permanent deformation, for thicker cross-section seal designs

Size Specifications

We support both standard and custom-sized seal rings to match your device specifications:

• Standard O-ring sizes range from 10mm inner diameter to 50mm inner diameter, with cross-section thickness from 1mm to 3mm
• For custom non-standard profiles (such as lip seals, stepped seals, or shaped seals), we can produce tooling based on your 2D drawings or 3D CAD models to match your exact device dimensions
• Minimum order quantities apply to custom tooled designs, please contact our sales team for details.

Material Grade

We offer two standard material grades for this product to match different regulatory and performance requirements:

• Food-contact grade: Meets FDA 21 CFR 177.2600 requirements for food-contact materials, recommended for consumer-facing personal care products sold in North America and the EU
• General industrial grade: Suitable for non-direct skin contact internal sealing applications, offering a cost-effective alternative for brands with lower regulatory requirements

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Quality Assurance

橡楚（湖北）橡胶有限公司 operates a quality management system certified to ISO 9001, with rigorous quality control processes implemented at every stage of production from raw material incoming inspection to finished product outgoing testing.

Our quality control procedures for LSR waterproof seal rings include:

• 100% visual inspection to eliminate any products with surface defects, flash, or dimensional irregularities
• Random sampling testing of physical performance (hardness, compression set, tensile strength) for every production batch
• Regular third-party testing to confirm compliance with restricted substance and skin safety requirements
• Full batch traceability, with all production and testing records retained for each order

For custom orders, we provide pre-production sample approval before full-scale manufacturing to ensure the seal ring matches your dimensional and performance requirements.

If you have any questions about our LSR Waterproof Seal Ring for Facial Cleanser or would like to request a quotation, please contact us at:

• Phone: +86 18071171144
• Email: churubber@163.com
• Address: No.54, Neihe Lane, Fankou Street, Echeng District Economic Development Zone, Ezhou City, Hubei Province, China