Mixing up K-Bond Sand (Similar to Petrobond)

Yes, difference in clay types. Bentonite absorbs water (for green sand[sand+clay+water]) and Bentone is modified to not absorb water (for oil-bonded sand[sand+clay+oil+polar activator]).

There are 2 main recipes in the thread, almost the same, different amount of clay and activator/catalyst. Can be used as percent ratios of sand if done by weight.
I am only 55# (our sand comes 50#/22.72kg) or 25 kg's deep into this so not an expert. We were -11 C (10F) last night, I brought my sand into the house so I could cast sometime over the long weekend.

Sponsored by Ray-Vin.Com...
100 lbs. sand - 100 mesh or finer - US Silica F110
6 lbs. Organo-bentone - Bentone 34 or VG-69
3 lbs. Polybut(e)ne (2 US Quarts) Indopol L-100 BP Petroleum or Chevron OLOA
0.2 lbs. (3.2oz or 91grams) Isopropyl alcohol - any pharmacy
- or -
0.2 lbs. (3.2oz or 91grams) Methanol (dry gas) - Auto Parts Store
- or -
0.2 lbs. (3.2oz or 91grams) Propylene Carbonate - Lab-Pro, Inc.

Tom Cobett & Associates (Kent State)
parts by weight Notes
100 sand 100-150 AFS GFN
6-7 K-BOND binder or Bentone 34
3 K-BOND Oil or Amorphous Polybutene or Indopol L-14 or H-7 or
Chevron Oronite OLOA 61005 or any SMOKELESS 2 stroke oil from
Walmart, etc.
0.25 K-BOND catalyst Propylene Carbonate or 95% Methanol+ 5% water

 

Thanks for summing this up in 1 spot, Tops!

On the hunt again for some off-the-shelf BENTONE. Found this link and ordered a sample but I am conflicted:

https://www.naturalpigments.com/organoclay-500g.html

Has the anti-K-Bond word "Bentonite" in a few spots but also calls it Organoclay BENTONE SD-1. Further down it goes on to say the powder in question is an organic derivative of Bentonite, which I believe is what Bentone is? Maybe Tom Cobett could enlighten us? Maybe it's not necessary.

I will be doing the water test laid out by Melterskelter here:

https://forums.thehomefoundry.org/i...-on-physical-charecteristics.2553/#post-50067

Lastly, it was $18 +$14 shipping but if one bought 7 QTY it would be $130ish but free shipping from this particular site.

 

Batty, I think you did good.

Snippet from this document, it is written for asphalt industry but compares SD-1 favorably to Bentone 34 which is in the K-Bond list:

https://www.elementis.com/fileadmin...02030601_Bitumen_sealer_non-AQ_B_34__SD_1.pdf

 

Thanks for that document. A pretty wordy 5 pages to say that SD-1 may be slightly better the 34 in terms of Bentone.



That little bit where it says 'without polar activators' is interesting. Also, the snippet seconds what Tom said about propylene glycol as a polar activator.

 

Propylene carbonate is the preferred polar agent (glycol shows up in the same searches) and I think it can be used for sand cores too with sodium silicate.

 

Ahhhhh! I meant propylene carbonate.

 

your going to have to go through a foundry supply to get petrobond clay

https://piedmontfoundrysupply.com/products-test-page/

or maybe these guys
https://www.bentonite.com/en/organoclays

Maybe Jessie can help
https://www.rheologicaladditive.com/what-are-the-different-types-of-organoclay/

offering a sample
https://www.barentz-na.com/us/case/products/Bentone 34


another very good lead
https://www.canfieldjoseph.com/

found a direct reference to these guys selling it
https://www.refcotec.com/

MIFCO used to sell sand
call and see if they can get of have a source for petrobond clay, BENTONE 34, or VG-69

HERE not 100% but online sale
https://theofmp.com/ofmp/en/USD/p/Vg-plus-Viscosifier?vendor=miswaco&brand=federal


Have fun

V/r HT1

 

Carpenter Brothers has P1, will need to call to initiate a quote
https://www.carpenterbrothersinc.com/locations/
https://www.carpenterbrothersinc.com/contact/

 

Where is there a P-Chem major specializing in organoclay when we need them?

 

did the K bond start to smoke when the flames went out???

V/r HT1
P.S. Inquiring minds want to know.

 

still looking for p-1 ???



I have to wonder if this is the same stuff in a reasonable amount???

https://www.amazon.com/Propylene-Carbonate-Purity-Solvent-1000ml/dp/B075GZDK4J


V/r HT1

 

I got the same stuff, one size smaller bottle, last year. I hear it helps to cure water glass core sand too.

 

I got to put my K-Bond to the test with cast iron at the Hoosier Pattern Iron Pour (in conjunction with the Decatur, IN sculpture walk) earlier this month.
I cannot say it was smokeless or flameless esp. at cast iron temps, but it worked to get my flask weights done, the pattern which has been tumbling around the garage since winter 2023. A couple of the Hoosier people found me some wood to use as a 'deadman' in one flask since I was about a pint short of sand to make both. The iron heat-affected or burnt-out more of the sand than would happen with aluminum but the two molds did not 'spontaneously combust' with the oil sand and wooden flask at cast iron temps. A neighboring iron spill did char one flask so I have that as a memento.