Liquid Silicone Rubber Diaphragm Gasket Washer

# Liquid Silicone Rubber Diaphragm Gasket Washer

*Product of 橡楚（湖北）橡胶有限公司*

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Product Overview

Liquid Silicone Rubber (LSR) diaphragm gasket washers are precision-molded sealing components designed to combine the flexible diaphragm function of a membrane with the static sealing performance of a gasket washer. Manufactured by 橡楚（湖北）橡胶有限公司 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, these components are engineered to deliver consistent, long-lasting sealing performance across a wide range of demanding operating conditions.

Unlike general-purpose rubber gaskets, our LSR diaphragm gasket washers leverage the inherent properties of injection-molded liquid silicone rubber to deliver uniform material distribution, tight dimensional tolerances, and exceptional resistance to temperature extremes, chemical degradation, and mechanical fatigue. Each product is produced under controlled manufacturing processes aligned with our quality management system, making them suitable for use in industries with strict performance and reliability requirements.

Our core selling points for this product include: tight dimensional control for consistent fit, broad temperature operating range, low compression set for long-term sealing, compatibility with most common industrial fluids, and custom manufacturing capability to match unique application requirements.

Technical Specifications

Material Properties

Our LSR diaphragm gasket washers are produced from high-purity addition-cure liquid silicone rubber, with the following base material properties:

Physical Performance

Standard performance parameters for our production are as follows (custom adjustments available for specific requirements):

Process Parameters

All our LSR diaphragm gasket washers are produced via liquid injection molding (LIM) to ensure consistent quality:

• Dimensional tolerance: ±0.05mm for features <100mm; ±0.1mm for features 100-300mm
• Maximum product diameter: 300mm
• Minimum thickness: 0.3mm
• Standard surface finish: Matte finish Ra 1.6-3.2μm (custom finishes available on request)
• Post-cure: 4h @ 150°C to remove volatile organic compounds (VOCs)

Product Advantages

1. Exceptional Long-Term Sealing Performance

Low compression set (as low as 8% in standard grades) means our LSR diaphragm gasket washers retain their shape and sealing force even after years of continuous compression and temperature cycling. Unlike organic rubber gaskets that harden, shrink, or leak over time, silicone maintains its elastic properties to prevent fugitive emissions and equipment failure.

2. Wide Temperature Compatibility

Our products operate reliably from -40°C to +200°C, making them suitable for both cryogenic applications and high-temperature process environments. They do not become brittle in extreme cold or soften and deform in high heat, outperforming nitrile rubber (NBR) and ethylene propylene diene monomer (EPDM) gaskets in extreme temperature conditions.

3. Excellent Chemical and Environmental Resistance

LSR is inherently resistant to ozone, UV radiation, moisture, and most common industrial chemicals including weak acids, weak bases, alcohols, and hydraulic fluids. It does not crack, degrade, or discolor after long-term exposure to outdoor or harsh process environments, making it ideal for both indoor and outdoor applications.

4. Precise Dimensional Control

Our liquid injection molding process delivers consistent, tight tolerances that ensure a perfect fit every time. This reduces installation time, eliminates the need for field modification, and ensures consistent diaphragm actuation for dynamic applications, preventing performance variation between production batches.

5. Clean, Non-Contaminating Formulation

Platinum-cured LSR contains no peroxide byproducts, leachable additives, or odors, making it suitable for use in food processing, pharmaceutical, and medical applications. Our manufacturing facility follows strict contamination control protocols to meet the cleanliness requirements of sensitive industries.

Applications

Our Liquid Silicone Rubber Diaphragm Gasket Washers are used across a wide range of industrial applications, including:

• Fluid Control Systems: Sealing diaphragms for pressure regulators, control valves, metering pumps, and solenoid valves, where the component acts as both a dynamic diaphragm and static sealing gasket to separate media while allowing actuation.
• Food and Beverage Processing: Sealing components for filling equipment, beverage dispensers, pressure cookers, and food processing machinery, where non-toxic, easy-to-sterilize properties are required.
• **Pharmaceutical and Medical Devices: Gaskets for drug delivery devices, diagnostic equipment, fluid handling systems, and sterilizable medical tools, compatible with autoclave and ethylene oxide sterilization processes.
• **Automotive Industry: Sealing components for automotive pressure sensors, fuel system regulators, engine valves, and HVAC systems, where resistance to engine bay temperature cycling and automotive fluids is required.
• **Renewable Energy: Sealing gaskets for solar panel mounting systems, hydrogen generation equipment pressure control devices, and wind turbine hydraulic systems, where long-term outdoor resistance is required.
• **Household Appliances: Sealing for water heaters, coffee machines, pressure cookers, and steam irons, where continuous exposure to hot water and steam does not degrade the seal.
• **Electrical and Electronics: Insulating sealing gaskets for sensor enclosures, junction boxes, and electronic control units, providing both environmental sealing and dielectric insulation.

Selection Guide

Hardness Selection

Choose the appropriate Shore A hardness based on your application requirements:

• 30-40 Shore A: For dynamic diaphragm applications requiring high flexibility and low actuation force, such as sensitive pressure regulators and small metering pumps.
• 40-55 Shore A: General-purpose option for most static sealing and moderate dynamic applications, balancing flexibility and compression resistance.
• 55-70 Shore A: For high-pressure static sealing applications and high-load dynamic applications where high sealing force and dimensional stability are required.

Size Specifications

We offer standard off-the-shelf sizes for common industrial applications, and also support full custom manufacturing to match your specific equipment requirements. We can produce components from 5mm up to 300mm in diameter, with thickness ranging from 0.3mm to 10mm. Please provide your 2D CAD drawing or sample for custom sizing quotes.

Material Grade

We offer three standard material grades to match different application requirements:

• Industrial Grade: For general industrial sealing applications that do not require food or medical contact, meets all standard performance requirements at a cost-effective price point.
• Food Contact Grade: Compliant with FDA 21 CFR 177.2600 requirements for food contact, suitable for food and beverage processing equipment.
• **Low-VOC Medical Grade: Post-cured to reduce volatile organic compounds to meet basic medical device requirements, suitable for general medical applications.

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 checks at every stage of production from raw material incoming inspection to final product shipment. Each batch of raw material is tested for physical properties before production, and every finished product undergoes 100% visual inspection and dimensional sampling inspection to ensure compliance with specification requirements.

We maintain full batch traceability for all products, with production records retained for a minimum of 3 years to support quality tracking and customer inquiries. For custom orders, we provide a first-article inspection report before full production to confirm dimensional and performance compliance with your requirements.

For inquiries, custom product development, or quotes, please contact us at:

• 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