Looking for the rubber/cotton hotwater pump packing. The old garlock number was 262RH. Is anybody using this on a worthington hotwater pump or a suitable substitute?

I don't know if there is an equivalent substitute for the original material or not. I made some out of PTFE for one. It worked well but something a little harder, like PEEK, might be a better option.

Original water pump end packing is available. It is Garlock 262RH. However the minimum order is 4,000 dollars. All I need is 6 foot of .625 x .625 packing, 300 dollars worth of this packing. Budget matters.

This 16mm x 16mm (0.629") carbonized PTFE should work;

"https://www.amazon.com/Packing-carbonized-Mechanical-Sealing-Custom/dp/B0C994GNM6?gQT=1&th=1"

$80 for 20 meters, your great great grandchildren (if applicable) should be able to keep your water pump leak free..

I found a 1968 Garlock Comparison Chart. Garlock 262-RH is "Fine White Hydraulic Coil Rock Hard". According to Garlock, the following products are equivalent:

Anchor 340-RH
Belmont 25-C
Chesterton 92
Collins 17
John Crane 845
Greene, Tweed 2110
Hercules 350-RH
Johns Manville 182-RH
Raybestos Manhattan 412-C
Sepco 213

I hope this helps.

Have you asked Garlok if there is a newer/current replacement for the product? That would be worth a try.

I would bet that any list of 'compatible" packing materials from 1968 still contained the "A" word, These feed water pumps where designed in the 1940's, long before PTFE was commonplace. I think a modern PTFE packing would outperform any "equivalent" packing listed in a 1960's specification.

this packing does not have the "A" in it never did. It is made of layers of fine woven cotton rubberized between 14 layers. The layup is a sheet layered to the thickness you order, 5/8 x 5/8 in my case. The layup is like a bed sheet layered, pressed and heated. The finished sheet is then slit into lengths. The Garlock catalogt still lists this product as 262RH and then references for locomotive feedwater pumps. The RH stands for rock hard. After slitting the pieces are backed again to harden the material. For these locomotives that do not put on the miles that they did in the steam days the RH is not needed as it does not wear out as it did in thy steam days. Because of the manufacturing process and low sales of the product Garlock only sells it by special order and so you would have to buy the production run at $4,000.

Remember that unlike PTFE on piston-valve bushings and the like, the hot-water pump seals only ever see temperatures corresponding to saturation temperature at exhaust pressure in the heat exchanger -- 250 to 270 F at typical exhaust back pressure?

Has anyone reached out to these folks?
https://signalproducts.com/