LSR Anti-collision Seal Strip for Smart Locks

The LSR Anti-collision Seal Strip for Smart Locks is a precision-molded liquid silicone rubber component designed to absorb impact, reduce noise, and seal gaps between the moving door lock bolt and the lock body of residential, commercial, and industrial smart door locks. Manufactured by 橡楚（湖北）橡胶有限公司 (Xiangchu (Hubei) Rubber Co., Ltd.) at our facility in 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号, this product leverages the inherent flexibility and durability of medical-grade liquid silicone rubber to solve common pain points of smart locks, including loud locking impacts, bolt wear, and air/ dust infiltration through lock gaps.

Unlike conventional EPDM or thermoplastic rubber seal strips, our LSR anti-collision seal strip is formulated to maintain consistent compression performance across wide temperature ranges, resist UV degradation and household chemical exposure, and retain its shape after hundreds of thousands of locking cycles. It is customizable to fit all standard and custom smart lock form factors, making it suitable for both original equipment manufacturer (OEM) production and aftermarket replacement applications.

Core selling points include long-cycle fatigue resistance, low temperature embrittlement resistance, non-toxic material formulation, and precision molding to match exact lock body dimensions.

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Technical Specifications

Material Properties

Our LSR anti-collision seal strip is produced from 100% solidified addition-cure liquid silicone rubber, with the following base material properties:

Physical Performance

Finished product performance meets the following requirements:

Process Parameters

Our standard manufacturing and molding parameters ensure consistent dimensional accuracy:

• Dimensional tolerance: ±0.1 mm for dimensions under 50 mm, ±0.2 mm for dimensions over 50 mm
• Molding process: Precision liquid injection molding (LIM)
• Surface finish: Matte, low-friction surface (custom glossy finish available on request)
• Post-curing: 4-hour low-temperature post-curing to eliminate residual volatile compounds
• Cut-to-length tolerance: ±0.5 mm for custom lengths

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Product Advantages

1. Extended service life matching smart lock longevity

Addition-cure LSR has exceptional fatigue resistance compared to general-purpose rubber. Our anti-collision seal strip retains 90% of its original compression performance after 500,000 locking cycles, eliminating the need for frequent replacement that plagues cheaper thermoplastic or EPDM alternatives. This matches the expected 5-10 year service life of most modern smart locks, reducing after-sales maintenance costs for both lock manufacturers and end users.

1. Stable performance across all ambient conditions

This LSR seal strip does not embrittle at sub-zero winter temperatures common in cold climate regions, nor does it soften or deform at high summer temperatures near black-painted exterior doors. It resists degradation from common household cleaners, rain, humidity, and UV exposure, making it suitable for both interior and exterior door smart lock applications.

1. Low-impact, low-noise operation

The tailored low-hardness LSR formulation absorbs the kinetic energy of the extending/retracting smart lock bolt, reducing impact noise that can disturb sleeping household members or building occupants. The soft, compliant surface eliminates metal-on-metal contact between the bolt and lock body, preventing wear and scratching that can lead to lock jamming over time.

1. Customizable precision manufacturing

We use high-precision liquid injection molding to produce seal strips matching the exact dimensions and geometry required by any smart lock design. We can accommodate custom cross-sections, lengths, hardness, and surface finishes to meet OEM design requirements, with low minimum order quantities for prototype and small-batch production.

1. Non-toxic, environmentally friendly formulation

All our LSR materials are non-toxic, free of phthalates, lead, and other restricted substances per RoHS and REACH regulations. The product does not release volatile organic compounds (VOCs) under normal use, making it safe for residential indoor applications.

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Applications

This LSR anti-collision seal strip is designed for use in all types of smart lock systems, including:

• Residential smart door locks: Used in main entrance doors, bedroom interior doors, and balcony doors for single-family homes and apartments. It reduces locking noise for night-time entry/exit and prevents dust and draft infiltration through lock gaps.
• Commercial smart access locks: Applied to office doors, co-working space access doors, hotel room smart locks, and shared storage unit locks. Its long cycle life supports high-frequency daily use common in commercial environments.
• Outdoor smart locks for gates and sheds: Suitable for exterior gate locks, garden shed smart locks, and vacation property access locks, where it withstands exposure to rain, temperature fluctuations, and UV radiation without performance degradation.
• Smart cabinet locks: Used for smart storage cabinets, locker locks, and home safe smart locks, where it reduces impact noise and prevents bolt wear from repeated use.

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Selection Guide

Hardness Selection

Hardness is matched to common smart lock application requirements:

• 20-25 Shore A: Maximum impact absorption and noise reduction, recommended for high-end residential smart locks and interior doors where quiet operation is a priority.
• 25-35 Shore A: Balanced impact absorption and shape retention, the most popular general-purpose option for most residential and commercial smart locks.
• 35-40 Shore A: Higher shape retention for high-frequency commercial access locks with over 100 locking cycles per day, suitable for high-traffic applications.

Size Specifications

We produce standard sizes to fit most popular smart lock form factors, and accept custom size orders:

• Standard cross-section dimensions: 2mm × 3mm, 3mm × 5mm, 4mm × 6mm (custom cross-sections available per drawing)
• Standard lengths: 40mm, 80mm, 120mm, 160mm (cut-to-length custom orders accepted)
• We can produce special geometries including U-shaped, L-shaped, and custom profiled seal strips per customer design drawings.

Material Grade

We offer two standard material grades to meet different application requirements:

• General Industrial Grade: Suitable for commercial locks and non-residential applications, meets all basic performance and regulatory requirements.
• Low-VOC Food-Contact Grade: Suitable for residential applications and smart locks that will be in frequent contact with human skin, with post-curing to reduce residual volatile compounds to below FDA food-contact limits.

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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 in-process quality checks at every stage of raw material inspection, molding, post-processing, and finished product testing. All raw materials are inspected for hardness and specific gravity before production, and every batch of finished seal strips is tested for dimensional accuracy, compression set, and appearance to ensure compliance with specification. We maintain full batch traceability for all orders to address any customer questions quickly.

For inquiries, custom samples, or bulk orders, contact us at:

• Company Address: 湖北省鄂州市鄂城区经济开发区凡口街道内河巷54号
• Phone: +86 18071171144
• Email: churubber@163.com