Description

Catalog No.	Cork Number	Bottom	Top	Height
		(in MM)	(in MM)	(in MM)
		±.2mm	±.2mm	±.2mm
19813/1	0	6	9	16
19813/2	0	8	10.5	20
19813/3	0	9	13	15.5
19813/4	1	11	14	18.5
19813/5	2	13	16.5	20
19813/6	3	14	19	21
19813/7	4	15	21	22
19813/8	5	17.5	22.5	23
19813/9	6	20	24.5	24
19813/10	7	20	26	27.5
19813/11	8	21	26.5	27.5
19813/12	9	21.5	28	31
19813/13	10	26	30	33
19813/14	11	29	33	32
19813/15	12	30	34.5	34.5
19813/16	13	31	38.5	37
19813/17	14	32	41.5	45.5
19813/18	15	38	42	40.5
19813/19	16	35	45	36.5
19813/20	17	40	49.5	40.5
19813/21	18	48	53.5	33.5
19813/22	19	44	58	45
19813/23	20	51	60	56.5
19813/24	22	50	65	41
19813/25	23	59	72	42

 Natural Rubber Solid Corks are high-quality sealing stoppers designed for laboratory glassware and general scientific use. Made from durable natural rubber, they create a secure, leak-free closure for tubes, flasks, and containers. Their temperature-resistant and chemically stable design ensures reliability in routine lab procedures and specialized industrial workflows.

 Key Features

• Premium natural rubber construction for excellent elasticity and sealing strength
• Temperature resistance from –40°C to +130°C for versatile lab use
• Smooth, tapered design ensures a tight, uniform fit in standard glassware
• High mechanical durability—resistant to cracking, drying, and deformation
• Non-reactive with common laboratory reagents
• Available in multiple sizes for universal compatibility
• Ideal for long-term storage, transport, and controlled experiments

Material Specifications

• Material: High-grade natural rubber
• Thermal Properties: Stable sealing performance from –40°C to 130°C
• Chemical Properties: Resistant to dilute acids, bases, and common solvents
• Mechanical Properties: Excellent flexibility, compression strength, and tear resistance
• Standards: Manufactured according to general laboratory rubberware guidelines (ISO / DIN compliant)

 Technical Specifications

• Length: 28 mm
• Base Diameter: 21 mm
• Top Diameter: 24 mm
• Tolerance: Standard molded rubberware tolerance for consistent fit
• Sizes: Available in multiple stopper numbers (various diameters and lengths)
• Accessories: None required; compatible with standard laboratory glassware

Handling & Precautions

• Store in a cool, dry environment away from direct sunlight
• Clean with mild detergent; avoid strong organic solvents
• Do not expose to flames or high-temperature sterilization beyond 130°C
• Avoid prolonged contact with oils or oxidizing chemicals
• Replace if signs of hardening, deformation, or surface cracks appear
• Ensure proper sizing to achieve secure and safe sealing

Applications

• General laboratory sealing of flasks, test tubes, and sample containers
• Chemical, biological, and pharmaceutical laboratories
• Academic and research institutions for routine experiments
• QC/QA laboratories for controlled sample storage
• Industrial testing labs requiring reliable closures
• Ideal for color-coded workflows, storage stability, and leak prevention