NATURAL RUBBER

Description

Rubber · CAS 9006-04-6 · C5H8. UNII 0A62964IBU. Boiling Point: 93 °F at 760 mmHg (NTP, 1992); Boiling Point: 34.067 °C; Boiling Point: 34 °C.

Identification

CAS Registry Number	9006-04-6
PubChem CID	6557
Molecular formula	C5H8
IUPAC name	2-methylbuta-1,3-diene
UNII (FDA)	0A62964IBU

Computed Descriptors

Molecular Weight	68.12
XLogP3	2.5
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	0
Rotatable Bond Count	1
Exact Mass	68.062600255
Monoisotopic Mass	68.062600255
Topological Polar Surface Area	0
Heavy Atom Count	5
Formal Charge	0

Physical & Chemical Properties

Boiling Point	93 °F at 760 mmHg (NTP, 1992)
Boiling Point	34.067 °C
Boiling Point	34 °C
Boiling Point	34 °C @760 [mm Hg]
Melting Point	-184 °F (NTP, 1992)
Melting Point	-145.95 °C
Melting Point	-146 °C
Melting Point	-146.7 °C
Flash Point	-65 °F (NTP, 1992)
Flash Point	-65 °F (-54 °C) (Closed cup)

Physical description & handling notes

• Isoprene, stabilized appears as a clear colorless liquid with a petroleum-like odor. Density 5.7 lb / gal. Flash point -65 °F. Boiling point 93 °F. May polymerize exothermically if heated or contaminated. If polymerization takes place inside a closed container, the container may rupture violently. Less dense than water and insoluble in water. Vapors heavier than air.
• Liquid; Other Solid
• Colorless liquid with a mild, aromatic odor; [HSDB]
• VERY VOLATILE COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR.
• Colorless volatile liquid
• Colorless, watery liquid

Regulatory Status

Regulatory & Food Contact	FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS CIR / INCI: Cosmetics ingredient -> Fragrance
GHS notification summary	0.1% (1 / 2428)

GHS Hazard Classification

GHS notification summary	0.1% (1 / 2428)
Reported hazard statements	H224, H341, H350, H412, H317 (65.5%), H334 (57.9%), H315, H304

Documented Uses

• Used as a monomer to manufacture polyisoprene and butyl rubber; [HSDB]
• Almost all isoprene produced is used for the preparation of polymers or copolymers. cis-Polyisoprene is the largest application with SIS block polymers a secondary application, and butyl rubber is a significant third application.
• Smaller amounts are used as an intermediate into specialty chemicals, including vitamins, pharmaceuticals, flavorings, and perfumes, and epoxy hardeners.
• Most of the isoprene that is produced is utilized for the synthesis of poly(cis-1,4-isoprene) (isoprene rubber, IR), a material (particularly the titanium type) that closely resembles natural rubber in both structure and properties. This IR is largely used for the production of vehicle tires. ... The second largest market for isoprene is the manufacture of styrene - isoprene - styrene (SIS) block copolymers ... These products are especially useful as thermoplastic rubbers and as pressure-sensitive or thermosetting
• Manufacture of "synthetic" natural rubber, butyl rubber. Copolymer in the production of synthetic elastomers.
• For more Uses (Complete) data for Isoprene (6 total), please visit the HSDB record page.

Synonyms

ISOPRENE; 78-79-5; 2-Methyl-1,3-butadiene; 2-Methylbuta-1,3-diene; Isopentadiene; 2-Methylbutadiene; 2-Methyldivinyl; 1,3-Butadiene, 2-methyl-; beta-Methylbivinyl; 3-Methyl-1,3-butadiene; DTXSID2020761; 0A62964IBU; NSC-9237; DTXCID20761; CHEBI:35194; NSC9237

Frequently Asked Questions

What are the CAS number and molecular formula of Rubber?

CAS 9006-04-6; molecular formula C5H8; molecular weight — g/mol.

What other names is Rubber known by?

ISOPRENE, 78-79-5, 2-Methyl-1,3-butadiene, 2-Methylbuta-1,3-diene, Isopentadiene, 2-Methylbutadiene.

What is the regulatory status of Rubber?

Documented regulatory listings: FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; CIR / INCI: Cosmetics ingredient -> Fragrance.

Is Rubber classified as hazardous?

0.1% of GHS notifications report no hazard classification (1 of 2428).

What are the key physical properties of Rubber?

Boiling Point: 93 °F at 760 mmHg (NTP, 1992); Boiling Point: 34.067 °C; Boiling Point: 34 °C; Boiling Point: 34 °C @760 [mm Hg].

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.