POLYTETRAMETHYLENE ETHER GLYCOL

H(OCH2CH2CH2CH2)nOH

PRODUCT IDENTIFICATION

CAS NO. : 25190-06-1

EINECS NO. :

FORMULA : H(OCH2CH2CH2CH2)nOH

MOL WT. : 250 - 3,000

H.S. CODE: 3907.20

TOXICITY : Oral rat LD50: > 5000 mg/kg

SYNONYMS : Poly(tetrahydrofuran); PTMEG; PTMG;

DERIVATION :

CLASSIFICATION :

PHYSICAL AND CHEMICAL PROPERTIES

PROPERTY
Average Mol wt.
1000
1800
2000
3000

APPEARANCE

white Waxy solid

HYDROXYL NUMBER
112
62
56
37

VISCOSITY (cps, at 40 C )
310
1240
1445
4300

SPECIFIC GRAVITY

0.975
0.974
0.974
0.97

REFRACTIVE INDEX
1.463
1.464
1.464
1.464

MELTING POINT

24 C
28 C
32 C
35 C

BOILING POINT

> 260 C

FLASH PONT

> 240 C

 

NFPA RATINGS : Health: 1; Flammability: 1; Reactivity: 0

STABILITY :  stabilised (with Butylated hydroxytoluene) PTMEG is Stable under ordinary conditions.

GENERAL DESCRIPTION & APPLICATIONS

Polyether segments in polyurethane provide soft and elastic polyurethane. Polytetramethylene Ether Glycol (PTMEG) and p,p-methylene diphenyl diisocyanate (MDI) are the main raw material of Spandex, elastic synthetic fiber. PTMEG, produced by cationic polymerization of tetrahydrofuran, is a waxy solid at room temperature. It is insoluble water and aliphatic hydrocarbons but soluble in alcohols, esters and ketones, aromatic solvents, and chlorinated hydrocarbons. Solubility will decrease if molecule weight increases. Molecule weight range of 1,800 - 2,000 PTMEG are used in Spandex production. PTMEG is also used in polyurethane elastomers, polyester, and polyamide production.

 

SALES SPECIFICATION

 

 
Average Mol wt.
Product
1,000 ± 50
1,800 ± 50
2,000 ± 50
3,000 ± 50
HYDROXYL NUMBER
106  - 118 (mgKOH/g)
60 - 65 (mgKOH/g)
55 - 57 (mgKOH/g)
36 - 39 (mgKOH/g)
COLOR, APHA

30 max

ACID NUMBER

0.05 max (mg KOH/g)

WATER

0.2% max

PEROXIDE

10ppm max

VOLATILES
0.1% max
STABILIZER
250 -350 ppm (Butylated hydroxytoluene)