Name: ZEMSIL OH-42
Brand: ZEMSIL

Question 1

What is ZEMSIL OH-42?

Accepted Answer

ZEMSIL OH-42 (Hydroxy-Terminated Polydimethylsiloxane (Medium MW), CAS 70131-67-8) is a ZEMSIL® silicone material. ZEMSIL OH-42 is a medium molecular weight (~1800 g/mol) hydroxy-terminated PDMS with viscosity ~42 cSt and ~2.0% OH content. Serves as the base polymer for RTV-2 condensation systems, silicone resin modifier, and key component in pressure-sensitive adhesive formulations.

Question 2

What is ZEMSIL OH-42 equivalent to?

Accepted Answer

ZEMSIL OH-42 is equivalent to DMS-S21, OHX-0050 and can be used as a direct drop-in replacement in most formulations.

Question 3

What are the main applications of ZEMSIL OH-42?

Accepted Answer

ZEMSIL OH-42 is used in: RTV-2 base polymer, Silicone resin modifier, PSA formulation, Condensation cure elastomers.

Question 4

What are the key specifications of ZEMSIL OH-42?

Accepted Answer

Viscosity @ 25°C: ~42 cSt; OH Content (KOH titration): ~2.0 %; Number-avg MW: ~1800 g/mol; Specific Gravity @ 25°C: 0.970; Flash Point: >150 °C

Question 5

What is the CAS number of ZEMSIL OH-42?

Accepted Answer

The CAS number of ZEMSIL OH-42 (Hydroxy-Terminated Polydimethylsiloxane (Medium MW)) is 70131-67-8.

ZEMSIL OH-42

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항목	값	단위	시험 방법
Viscosity @ 25°C	~42	cSt	—
OH Content (KOH titration)	~2.0	%	—
Number-avg MW	~1800	g/mol	—
Specific Gravity @ 25°C	0.970	—	—
Flash Point	>150	°C	—