{Collins} Re: 811-A Help



Silicone cement is easily usable up to 400°F maybe even 500°F or go to your
local auto parts store and get a tube of exhaust system sealer, i.e.,
muffler cement.

David C. Hallam
KC2JD

-----Original Message-----
From: collins-bounce@xxxxxxxxxxxxxxxxxxxxx
[mailto:collins-bounce@xxxxxxxxxxxxxxxxxxxxx]On Behalf Of Roy Morgan
Sent: Monday, October 18, 2004 11:12 AM
To: W5vhp@xxxxxxx; collins@xxxxxxxxxxxxx
Subject: {Collins} Re: 811-A Help

At 06:51 PM 10/16/2004, W5vhp@xxxxxxx wrote:
>Hello to all....
>I have a nearly new 811-A that is loose in the base.  Real loose.
>
>I know that the manufacturer used some sort of adhesive to "glue" the glass
>envelope to the bakelite base.

Larry,

The formulas for the original tube base (and top cap) cement has been
posted to some list or another in the past few years.  Trouble is you have
to mix some odd components and then heat the tube to cure it.  (I'll send
Larry and any other folks my collected notes file on tube cements off list.)

I have found that Furnace and Retort Cement works well for the job.  It
does contain fine sand however and may not flow easily into very thin
spaces.  Some fellows have used epoxy (certain epoxies are rated for high
temperature) or cyano acrylate  (sp?) cement (wonder glue).

I Bought at Grainger a quart of:
Parker Furnace and Retort Cement:
Max Temperature 3000 F
Parker product # 312-1345
Cost: $5.41 tax included.  Grainger number 5E263

Appears to be made by:
Furnace & Retort Cement (2 Lb.)
by William H. Harvey Company
However, the MSDS from the Grainger web site says:
MANUFACTURER'S NAME:  SURE SEAL PRODUCTS
ADDRESS:  1901 W. DIVISION ST.
CITY, STATE, AND ZIP:  CHICAGO, IL. 60622

EMERGENCY TELEPHONE NO. 312-278-8150

----------------------------------------------------------------------------
--
    HAZARDOUS COMPONENT(S)
----------------------------------------------------------------------------
--
AQUEOUS SOLUTION OF ALKALINE
   SODIUM SILICATE

This stuff is water based and dries only modestly hard.. After heating as
hot as you dare, it becomes VERY hard and essentially fireproof. I glued a
couple of coins together and put them on the electric stove burner.  One
pair of coins came apart but I suspect they were not clean, and/or the glue
took the plating off the metal.  I don't know it's RF characteristics, so I
would not fill a tube base with the stuff.

Roy




- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan@xxxxxxxx --

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