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#761083 - 11/03/06 06:14 AM Flashpoint Testing Method ASTM D-92 vs. ASTM D-93
silverbullet Offline

Registered: 10/12/05
Posts: 62
Loc: Northern California
Does anyone know what the difference is in the test methods between the two?

I recently checked the Dino Pennzoil 5w30 flashpoint as 216 deg. F (ASTM D-93) and Pennzoil Platinum 5w30 flashpoint as 196 deg. F (ASTM D-92).

At first I thought, why would the Dino Pennzoil have a that much of a higher flashpoint than their "best" Platinum line. Then I realized the test methods were different. So it led me to the question of what's the difference in the two methods?

#761084 - 11/03/06 08:01 AM Re: Flashpoint Testing Method ASTM D-92 vs. ASTM D-93 [Re: silverbullet]
Blue99 Offline

Registered: 09/27/03
Posts: 2233
Loc: Wisconsin
ASTM D-92 is the Cleveland Open Cup test.

ASTM D-93 is the Pensky-Martens Closed Cup test.

The closed-cup method prevents vapors from escaping and therefore usually results in a flash point that is a few degrees lower than in an open cup.

Base oils typically are 220C+ flashpoints, so it is the volatility of an additive that is producing the lower flash in a fully formulated motor oil.

#761085 - 11/03/06 03:10 PM Re: Flashpoint Testing Method ASTM D-92 vs. ASTM D-93 [Re: Blue99]
Primus Offline

Registered: 07/29/03
Posts: 886
Loc: Kiev, Ukraine
D-93 value is usually about 20 deg C lower than that of D-92

Edited by Primus (11/03/06 03:11 PM)

#761086 - 11/03/06 08:20 PM Re: Flashpoint Testing Method ASTM D-92 vs. ASTM D-93 [Re: Primus]
bruce381 Offline

Registered: 06/23/05
Posts: 3327
Loc: Millbrae, CA
All correct and to add I have always used the PMCC for flash under 200F for light distillates.