question to ホキ5700 kit HO-702 by TOMIX

[al camino]

Hi

 

Dies anyone know the exact plastic type Tomix used for their kit?

At least the truck (bogie) runner is not PS or ABS.

The same impression to  me has runner C (ladder, grabs, handrails, hose).

 

I am asking because i's like to select the best cement (glue) to build my remaining 5 unassembled cars.

Car #1 assembled around 20-22 years ago falls apart as the glue did not do the requested job on the plastics.

 

Many thanks for helping.

[cteno4]

Al,

 

wonder if it’s a polyethylene. Is it a bit softer? Finding the right cement can be a puzzle. I use chunks of the sprews to just test glues I have laying around.
 

ive recently tried this glue system on a non abs/bs (im pretty sure polyethylene) clip on the big dog food bin that got snapped in two. Epoxy and ca popped off it in a test, but this stuff did it! It’s gets a lot of lateral stress when it’s closed. Luckily long sort of ragged snap so it was the best surface to join. You basically run the marker along one side of the joint and then apply the cement to the other piece and let sit for 30 sec or so then press fit. It seemed to bond in a minute and they suggest a day or two to fully cure. The cement is a ca and the activator is n-heptane. But it was able to bond polyethylene which is usually not so fun!

 

https://www.homedepot.com/p/Loctite-Plastics-Bonding-System-2g-Super-Glue-681925/100371829

 

e6000 is also a goto glue for adhering bits anything to most anything. But it’s not super tough and it’s a tad flexible, but it sticks well to things others don’t bond to for some hold.

 

jeff

[Claude_Dreyfus]

I used brush-on plastic weld on my H0-700 tankers. It's very effective, but quite brutal and unforgiving if you make a mistake.

 

https://howesmodels.co.uk/product/plastic-weld-glue-57ml/?gclid=CjwKCAjwrcH3BRApEiwAxjdPTZ1DrZ6QmVIItFapvMvQnzminRg7rr38GJXQP3OrD_AIlqHUleo_GBoCa1cQAvD_BwE

 

Use an old brush that doesn't matter...it will die...

Edited June 22, 2020 by Claude_Dreyfus

[cteno4]

That must mean all the parts are abs or ps.

 

jeff

[Kiha66]

It may be worth looking into canopy glue, its slow drying but bonds well with dissimilar parts and is pretty forgiving, you can even remove it later with a bit of work.  Its also somewhat flexable so its great for securing handrails and stuff that might get bumped.

[cteno4]

Yeah that why the e6000 is nice that it dries a bit flexible as well for those situation.

 

jeff

[Kanpai Keith]

Both ABS (Acrylonitrile Butadiene Styrene) and PS (Polystyrene) are amorphous polymers and will accept paints and styrene based adhesive readily.  Polyolefins such as Polypropylene and Polyethylene are semi-crystalline as are solvent resistant.

 

your best bet would be to try cyanoacrylate adhesive and rough up both surfaces a little first and apply an etch (acid) primer before gluing.

Edited August 22, 2020 by Kanpai Keith

[Kamome]

On 6/23/2020 at 2:35 AM, al camino said:

Dies anyone know the exact plastic type Tomix used for their kit?

Did you manage to find something suitable? I’m about to start putting together my Taki 1900s so would appreciate your input. The instructions state using an adhesive suitable for soft plastic or rubber.

[al camino]

Hi all

 

This week my parcel with monthly shipping of reserved items arrived.

The 2 sets of TOMIX タキ1900 are now mine and here.

First test was with my liquid Revell plastic glue (mainly styrene = PS). It worked but very weak solving the Tomix plastic.

I now assume it is ABS as is used with a lot of model railroad items. For example all KATO shells are made of ABS.

A fresh bought UHU PLAST (for PS, ABS, SAN, SB, ASA, PVC, PMMA and PC) proved to be perfect for all runners except trucks and handrails.

 

The trucks and handrails were made of engineering plastic (POM, PA, PP or such) and need super glue.

 

I hope sharing this information is useful for all.

Edited September 12, 2020 by al camino
typo

[Kamome]

Thanks Camino,

 

I have started building my tankers too and found some Tamiya cement for ABS so I can at least get the body assembly under way. 

 

The recycling information on the back of the box states the materials used rather than on the instructions for some reason. The generic information of using an adhesive for soft plastic and rubber was extremely vague and of little help.  
 

Body - ABS, POM

Frame - POM

Wheels - BS

 

The Tamiya ABS cement works well but it’s a little gloopy and the supplied applicator brush is way too big for more detailed work like this. It takes a while to cure so plenty of time to adjust parts but initial bonded parts seem very strong.

[al camino]

On 9/13/2020 at 1:58 AM, Kamome said:

Body, Frame - ABS

Handrails - POM

Truck (bogie) Frames - POM

Wheels - BS

 

Updated the table by my observation.

 

The glue solved the body frame as with the other body parts. --> ABS

The Handrail runner did not react in any way to the glue. --> POM

 

What stand BS for?

 

[Kamome]

Usually I know BS as bulls**t. I’m assuming a typo and should read PS or could be a Japanese abbreviation to another type of plastic. But that threw me too!

[al camino]

Meanwhile I thought that BS is typo of PS.

 

I also realized now that the HS page offered a material note common to most of Tomix HO stuff.

The PS makes sense to me for the windows of passenger cars, EMU, DMU etc.

This seems to be a confirmation of our observation.

(I hope this screen shot does not violate the rules)