Dropper bottle teats
- Lyn
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Re: Dropper bottle teats
I very rarely (perhaps never) send out the glass dropper bottles with the glass and rubber pipettes. I have lots of empty bottles stored in trays but these do not get used. Over the years I seem to have trained the science teachers (senior) to accept that the chemicals now come in plastic dropper bottles. Trained the junior teachers years ago. It is so much easier.
Question: Is this wrong?
Question: Is this wrong?
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Re: Dropper bottle teats
I floated the idea of the plastic ones and was told no way , our mob would squirt each other with them .....maybe ....maybe not ....I'll never find out .
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Re: Dropper bottle teats
I've found they are a bit trickier to use, easy to go a bit heavy handed. Also had some that the lids split after a while, so the chemical would come flying out the side when the students squeezed the bottle. That was a very long time ago, don't know if they have improved (the bottles, not the students) - the last few schools I've been at have only had the glass bottles.
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Re: Dropper bottle teats
RE: Silicone rubber teats
So long as I check the droppers when they come back and make sure they are not over tight , they seem to work fine . 5 months now .
The ones with alcohol in them like phenolphalien which would normally deteriorate very quickly seem just fine .
I will order some more .
Well it does appear that this was the problem.bigmack wrote: ↑15 Oct 2018, 10:27
Anyway. come in today and went to top up the 1M sodium hydroxide ones for a prac and discovered that several of them have started to "become one " with the dropper bottle requiring peeling off .................. It's possible that the kids just screwed the lids on really tight .
So long as I check the droppers when they come back and make sure they are not over tight , they seem to work fine . 5 months now .
The ones with alcohol in them like phenolphalien which would normally deteriorate very quickly seem just fine .
I will order some more .
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Re: Dropper bottle teats
Update on the Silicone rubber teats .They hate Acid
After 7 months on HCl 1M and they are disintegrating . Ones on NHO3 1M no better . However they seem to be fairing OK with Alcohol based indicators such as Phenolthalien and universal Indicator which the Red Rubber ones didn't like .
The Sodium Hydroxide also seems happy in the silicone Rubber . As do the Silver Nitrate.
So It's looking like I will go back to Red Rubber for acids and use the Silicone Rubber for the rest .
After 7 months on HCl 1M and they are disintegrating . Ones on NHO3 1M no better . However they seem to be fairing OK with Alcohol based indicators such as Phenolthalien and universal Indicator which the Red Rubber ones didn't like .
The Sodium Hydroxide also seems happy in the silicone Rubber . As do the Silver Nitrate.
So It's looking like I will go back to Red Rubber for acids and use the Silicone Rubber for the rest .
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Re: Dropper bottle teats
Thanks for the update, Richard. I'm not sure if even these ones are still available, might need to get onto MTA who have bought Serrata to see if they can help us out. If we can use the black ones on a lot of solutions, it will keep us out of trouble for a few years.
Otherwise, no luck from anyone being able to supply the red rubber teats on their own. There is a labbie on the ASET email list in NSW who has been trying to source them, but without success.
Otherwise, no luck from anyone being able to supply the red rubber teats on their own. There is a labbie on the ASET email list in NSW who has been trying to source them, but without success.
- Lyn
- Posts: 706
- Joined: 16 May 2006, 10:00
- Job Title: Lab Assistant (Technician)
- School: St. John's Catholic College
- Suburb: Darwin
- State/Location: NT
Re: Dropper bottle teats
Are the red rubber teats available on the Westlab site not the right size for what you require? Seems only logical to check what our lab tech site benefactor has to offer.
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Re: Dropper bottle teats
Don't think they are the right ones Lyn. Just looked at the photo on the website of "Teats Rubber". They don't have the rim around the bottom that holds them into the white plastic cap of the dropper assembly. I don't usually buy from the benefactor, regardless.
Re: Dropper bottle teats
I don't have any dropper bottles anymore all in stull bottles no more contamination, less spills and very little deterioration. Silver nitrate bottles are covered in foil been using like that for 8-9 years now not a problem. Iodine in amber regent bottles kid use disposable droppers.
So much easier, 125ml bottles so don't need to be filled as often.
Have never had a problem with kids squirting, our teachers had the same thoughts.
So much easier, 125ml bottles so don't need to be filled as often.
Have never had a problem with kids squirting, our teachers had the same thoughts.
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Re: Dropper bottle teats
Yep I discovered this yesterday!
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Re: Dropper bottle teats
The old Serrata link now brings you to MTA ....seems like they only changed over a few days ago . But yes MTA have them ( the black silicone ones )
Interestingly the MTA ( Serrata) web catalog seems much easier to use than the old Serrata one
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Re: Dropper bottle teats
Macca , how do the labels stay on the stull bottles ? I 'm just thinking they would be soft and squeezy and labels wouldn't stick to wellmacca wrote: ↑25 Jun 2019, 12:08 I don't have any dropper bottles anymore all in stull bottles no more contamination, less spills and very little deterioration. Silver nitrate bottles are covered in foil been using like that for 8-9 years now not a problem. Iodine in amber regent bottles kid use disposable droppers.
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Re: Dropper bottle teats
I have bought some things from MTA - their printed catalogue was HUGE, but not a lot of science stuff. I guess Serrata will fill a gap. The things I bought from MTA (some embedded specimens) were very good quality. I might try the black silicon ones next time I'm ordering.
Thanks again, Richard, for the update.
Thanks again, Richard, for the update.
Re: Dropper bottle teats
I've bought two different types of "Stuhl" bottles. One was good quality, firm plastic. The other was very thin, soft and over-flexible. I use the cheaper version for detergent, oil, etc, and keep the better quality ones for chemicals. I can't remember who I bought them from, sorry!bigmack wrote: ↑25 Jun 2019, 14:55Macca , how do the labels stay on the stull bottles ? I 'm just thinking they would be soft and squeezy and labels wouldn't stick to wellmacca wrote: ↑25 Jun 2019, 12:08 I don't have any dropper bottles anymore all in stull bottles no more contamination, less spills and very little deterioration. Silver nitrate bottles are covered in foil been using like that for 8-9 years now not a problem. Iodine in amber regent bottles kid use disposable droppers.
Re: Dropper bottle teats
Hi Prima & Bigmack,
I purchase mine from Hains educational only buy the 125ml you can buy extra caps if need be. I don't have any trouble with the labels (Risk Assess), use laser printer on A4 paper and just use sticky tape over the top.
Students and teachers are all aware and taught from Yr7 that all lids are to be closed before returning to prep room.
I purchase mine from Hains educational only buy the 125ml you can buy extra caps if need be. I don't have any trouble with the labels (Risk Assess), use laser printer on A4 paper and just use sticky tape over the top.
Students and teachers are all aware and taught from Yr7 that all lids are to be closed before returning to prep room.
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Re: Dropper bottle teats
Note: $4.50 it for a 10 pack not each
https://www.teaching.com.au/search?acti ... pe=product