Crossy Posted October 17, 2022 Share Posted October 17, 2022 Has anyone come across an aerosol PU foam that is specifically stated as "Rodent Resistant"? We have an issue with the local wildlife entering underfloor cable ducting and chowing down on the cables. Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 Might look for a rat repellent spray with cat urine . other than a 5,000 v capacitor charge on the the duct……maybe a metalized epoxy or the mineral fiber based sealant used for firebox brickwork ? I have not heard of any PU foam product that is rat resistant. 1 Link to comment Share on other sites More sharing options...
carlyai Posted October 17, 2022 Share Posted October 17, 2022 No, not I, but sometimewoodworker will surely have heard of it. ???? Not sure of you cable duckting and water levels, but when those horrible things ate out my genset wiring I put down those round glue pads. That seems to have done the trick. 2 Link to comment Share on other sites More sharing options...
Crossy Posted October 17, 2022 Author Share Posted October 17, 2022 11 minutes ago, carlyai said: Not sure of you cable duckting and water levels, Don't worry, the ducts are on elevated monorail stations, if they flood Bangkok will have bigger issues ???? 1 Link to comment Share on other sites More sharing options...
MJCM Posted October 17, 2022 Share Posted October 17, 2022 (edited) 37 minutes ago, carlyai said: I put down those round glue pads. That seems to have done the trick. Good idea, you can buy the glue separately and then put the glue on the PU foam after you sprayed it Edit: https://www.lazada.co.th/products/bosny-rat-glue-400-ml-i1883856899-s5883100880.html and this one your local shop might have it https://www.lazada.co.th/products/n-rat-1-i2825625264-s10319861106.html Edited October 17, 2022 by MJCM 1 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted October 17, 2022 Share Posted October 17, 2022 I can’t assist on this one, but I strongly suspect that the requirement is for cubic metres (expanded volume) or cases of the product, so a spray and forget solution is needed. In a domestic situation things are rather different. 1 Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 I see two things online for rodents - peppermint oil spray ( maybe not good for cable insulation ?) and medium steel wool with PU or latex expanding foam pushed through it after steel wool pressed into hole. Supposedly mice hate to chew medium steel wool embedded in the foam. 2 Link to comment Share on other sites More sharing options...
Crossy Posted October 17, 2022 Author Share Posted October 17, 2022 The volumes needed aren't really massive. Close off (just enough to block the creatures) 8 off 50mm x 150mm ducts on 60 ish stations. I quite like the steel wool idea, that would certainly be unappetizing! 1 Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 A mouse can get through a hole with the area of a US nickel coin 1 Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 Make sure the propellant in the foam is non-ignitable as the gas will work its way into the electrical equipment. 2 Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 Just based on molecular weight of the gas molecule. Link to comment Share on other sites More sharing options...
Crossy Posted October 17, 2022 Author Share Posted October 17, 2022 7 minutes ago, degrub said: A mouse can get through a hole with the area of a US nickel coin These chaps are rather larger than a mouse ???? Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 You just need a bbq ! Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 Looks like there are some intumescent one part PU sprays used for firestop application for walls that might suit. Link to comment Share on other sites More sharing options...
degrub Posted October 17, 2022 Share Posted October 17, 2022 https://odice.com/EN/products/intumescent-pu-foams-and-sealants.html don’t know what is available in country, but they have to be using for substations and MCCs Link to comment Share on other sites More sharing options...
Daffy D Posted October 17, 2022 Share Posted October 17, 2022 Steel wool would have to be fixed or they'll scratch it out. Perhaps a mix of expanding foam and steel wool. Kitchen scour pads work quite well. 2 Link to comment Share on other sites More sharing options...
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