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Rubber Stoppers

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MOQ : 1000 Pieces

Rubber Stoppers Specification

Usage & Applications
Laboratory sealing, chemical container closure, test tubes, flasks, and bottles sealing applications

Product Type
Rubber Stopper

Material
Rubber (Natural or Synthetic)

Style
Solid and one/two-hole types available

Components
Single piece molded

Tolerance
0.3 mm

Natural Rubber
Available in Natural and Synthetic rubber options

Size
Standard laboratory sizes (#0 to #12+)

Resistance level
Resistant to acids, alkalis, solvents

Temperature Resistance
Up to 110C

Volatile Matter (%)
<2%

Color
Black or White

Part Type
Stopper/Plug

Thermal Conductivity
Low

Density
1.20 Gram per cubic centimeter(g/cm3)

Ash %
<1%

Water Absorption
Low (<5%)

Diameter
Tapered; top diameter 20-48 mm, bottom diameter 15-40 mm

Feature
Non-reactive, leak-proof, reusable, odorless

Compression Ratio
Good, suited for tight sealing

Weight
4-35 grams, size dependent

Length
25 mm to 45 mm

Tensile Strength
16-21 MPa

Hardness
40-60 Shore A

Nitrogen Content (%)
Negligible

Surface Finish
Smooth or slightly textured

Thickness
Varies per size, typically 18 mm-38 mm

Flame Resistance Level
Limited flame resistance

Width
Varies as per stopper size (e.g., 20 mm to 48 mm)

Rubber Type
Natural Rubber / Synthetic Rubber

Operating Pressure
Suitable for atmospheric and low-pressure applications

Reusability
Can be reused multiple times

Odor
Odorless or very low odor

Elongation at Break
350450%

Aging Resistance
Good ozone and aging resistance

Chemical Compatibility
Compatible with most laboratory chemicals

Manufacturing Process
Compression or injection molded

Storage Recommendation
Store in cool, dry place away from sunlight

Sterilization Compatibility
Autoclavable

Regulatory Compliance
Meets standard laboratory supply requirements

Rubber Stoppers Trade Information

Minimum Order Quantity
1000 Pieces

Main Domestic Market
South India, Karnataka

About Rubber Stoppers

Rubber stoppers, also known as rubber plugs, are cylindrical or conical-shaped rubber pieces used to seal the openings of laboratory equipment, medical devices, and other containers. They are typically made of natural rubber, synthetic rubber, or silicone, which are flexible and resistant to temperature changes, chemicals, and abrasion.Rubber stoppers are commonly used in laboratories to seal test tubes, flasks, and other glassware to prevent spillage or contamination. They can also be used in medical devices, such as syringes, to seal the openings and maintain the sterility of the device. Rubber stoppers are also used in a variety of industries, such as pharmaceuticals, food and beverage, and chemical manufacturing, to seal containers and prevent the contents from leaking or spilling.Rubber stoppers come in a range of sizes and shapes to fit different types of openings. They can be tapered, straight-sided, or have a flange or lip that extends beyond the opening. Some rubber stoppers may also have a hole in the center to allow for the insertion of a pipette or other instrument.

Superior Chemical and Aging Resistance

These rubber stoppers demonstrate robust resistance to most laboratory chemicals, acids, alkalis, and solvents. Their composition ensures that they remain resilient when exposed to ozone and during long-term use, which is essential for maintaining integrity in laboratory environments. This makes them suitable for both short-term and extended applications, reducing the need for frequent replacements.

Precise Fit and Versatile Applications

Each stopper is engineered in standard laboratory sizes (#0 to #12+) and comes in solid, one-hole, or two-hole varieties to suit various sealing needs. The tapered design ensures compatibility with common laboratory glassware, including test tubes and flasks, while the non-reactive, leak-proof structure supports both atmospheric and low-pressure applications.

Autoclavable and Reusable for Enhanced Efficiency

Thanks to autoclavable properties, these stoppers can withstand sterilization cycles up to 110C without degrading. This attribute, coupled with odorless material and a low volatile matter percentage, ensures repeated safe use in sensitive lab operations. Their durable construction and low water absorption further contribute to their reusability.

FAQs of Rubber Stoppers:

Q: How do I properly sterilize rubber stoppers for laboratory use?

A: Rubber stoppers can be sterilized using an autoclave, as they withstand temperatures up to 110C. Ensure the stoppers are cleaned with appropriate detergent, rinsed thoroughly, and then autoclaved according to standard laboratory sterilization procedures. Allow them to cool before use to maintain their properties and sealing effectiveness.

Q: What chemicals are rubber stoppers compatible with?

A: These rubber stoppers are compatible with most laboratory chemicals, including acids, alkalis, and common solvents. Their material formulation provides non-reactive and leak-proof performance, making them suitable for a wide range of both aqueous and organic reagents.

Q: When should I replace a rubber stopper?

A: You should consider replacing a rubber stopper if it shows visible signs of wear, deformation, cracking, or compromised sealing. Due to their excellent aging resistance and reusability, stoppers can be used multiple times, but regular inspections are recommended to ensure safe and effective operation.

Q: Where can these rubber stoppers be used in the laboratory?

A: These stoppers are utilized for sealing laboratory equipment such as test tubes, flasks, reagent bottles, and chemical containers. They are suitable for both storage and experimentation tasks where atmospheric or low-pressure sealing is required.

Q: What is the manufacturing process of these rubber stoppers?

A: Rubber stoppers are produced through either compression or injection molding processes. Both techniques yield single-piece, molded stoppers that ensure uniform density, tight tolerances, and a smooth or gently textured finish.

Q: How does the design benefit laboratory applications?

A: The tapered, leak-proof design ensures a secure seal for varying glassware openings, preventing contamination and spillage. The use of non-reactive, odorless material with high tensile strength and low volatile matter suits sensitive chemical environments and elevates laboratory safety and efficiency.

Q: What are the recommended storage conditions for rubber stoppers?

A: Rubber stoppers should be stored in a cool, dry place away from direct sunlight to preserve their chemical and physical properties. Proper storage reduces premature aging, maintains elasticity, and ensures optimal performance when needed.

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