Neminath Instruments Neminath Instruments

Neminath Instruments

Lab Rubber Cork

High-quality lab rubber cork for sealing test tubes and flasks. Flexible, durable, chemical-resistant, and ensures a tight, leak-proof fit for lab use.

Lab Rubber Cork

1. Application

Rubber corks are used for:

  • Sealing laboratory flasks, test tubes, burettes, and reagent bottles
  • Temporary or semi-permanent closure of glassware
  • Air-tight sealing during chemical reactions
  • Microbiology and culture applications
  • Gas delivery setups (with bored corks)
  • Educational laboratory experiments

Widely used in chemical, pharmaceutical, dairy, environmental, and academic laboratories.

2. Compliance Standard

  • Manufactured under ISO 9001 Quality Management System
  • Conforms to general laboratory-grade material standards
  • Non-toxic and laboratory-safe composition
  • Suitable for GLP-compliant laboratory use

(Specific regulatory compliance depends on manufacturer and material type.)

3. Product Description

Rubber corks are tapered sealing plugs made from high-quality natural rubber or synthetic elastomer. They are designed to provide a secure and leak-proof fit in laboratory glassware.

Available in:

  • Solid type (plain)
  • Single-bore (1 hole)
  • Double-bore (2 holes)
  • Custom bored configurations

The tapered design ensures tight sealing while allowing easy insertion and removal.

4. Technical Specifications

Parameter

Specification

Material

Natural Rubber / Neoprene / Synthetic Elastomer

Color

Black / Brown

Shape

Tapered (conical)

Type

Solid / 1-hole / 2-hole

Hardness

40–60 Shore A (approx.)

Temperature Resistance

Up to 100°C (short duration)

Chemical Resistance

Moderate (not suitable for strong solvents & concentrated acids)

Surface Finish

Smooth, non-porous

Reusability

Yes

5. Apparatus is Supplied

  • Rubber cork (as per selected size and type)
  • Bulk packaging (pack of 10 / 50 / 100 pieces depending on order)

6. Optional Accessories

  • Glass tubing
  • Delivery tubes
  • Bunsen burner assembly
  • Retort stand & clamps
  • Flask and test tubes
  • Cork borers (for custom hole making)

7. Common Sizes Available

Rubber corks are available in standard numbered sizes:

Size Range:
No. 000, 00, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16

(Custom sizes available on request.)

8. Dimensions & Weight (Approx.)

Size No.

Top Diameter (mm)

Bottom Diameter (mm)

Height (mm)

Approx. Weight

0

12

9

20

5–8 g

3

19

15

22

8–15 g

5

26

21

25

15–25 g

8

32

27

30

25–40 g

10

38

32

35

40–60 g

12

44

36

38

60–80 g

14

50

42

40

80–120 g

16

58

48

45

120–180 g

Note: Dimensions may slightly vary depending on manufacturer.

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