Lampwork Etc.
Mountain Glass Arts

LE Live Chat

Enter Live Chat

No users in chat

Donate via PayPal to

Glacial Art Glass


Go Back   Lampwork Etc. > Library > Tips, Techniques, and Questions

Tips, Techniques, and Questions -- Technical questions or tips

Thread Tools
Old 2022-03-05, 11:57am
Smokaijo's Avatar
Smokaijo Smokaijo is offline
Junior Member
Join Date: Jun 12, 2018
Location: Surrey
Posts: 2
Default Can you make marbles using Bullseye & Boro together?

My partner has just started using Boro & loves it but Iíve seen some Bullseye for sale - can it be added to Boro or are they totally incompatible??
Please excuse my naive question as Iím a novice at this.
Reply With Quote
Old 2022-03-05, 1:46pm
ESC ESC is online now
Senior Member
Join Date: Feb 02, 2010
Posts: 3,410

Hi! You absolutely cannot use boro with any other glass besides boro. Same goes for Bullseye. The 104 glasses are compatible sometimes, but not always. Explore the tips and techniques page, as there's a ton of info in there on mixing COEs (or not).
Soft glass on a Minor/concentrator since 1996
Reply With Quote
Old 2022-03-06, 7:07pm
Sue in Maine's Avatar
Sue in Maine Sue in Maine is offline
Senior Member
Join Date: Jun 14, 2005
Location: The Rocky Coast State!
Posts: 6,620

No, absolutely now. The COE's (Cohesions of Expansion) are too far apart. Think of it like jello and ice. They're both solid forms but they don't stick together... and with glass incompatibilities, you could be talking about some glass explosions you don't want to be close to.


DRAT-I always do that! It
s COEFFICIENT, not cohesions. Why can I never remember that word?!?!?!
Sue Walsh
The past is history,
The future is a mystery
and the present is a gift.

Last edited by Sue in Maine; 2022-05-11 at 5:36pm.
Reply With Quote
Old 2022-03-07, 2:21pm
echeveria's Avatar
echeveria echeveria is offline
Senior Member
Join Date: Aug 31, 2006
Location: Knoxville, TN
Posts: 2,236

The coefficiency of expansion for borosilicate glass is 33 COE, and for Bullseye, 90 COE. That is very far apart in terms of glass compatibility, and as has been stated, likely to shatter dramatically even if you can get them to combine.
Reply With Quote
Old 2022-03-08, 3:06pm
queenofsheba52 queenofsheba52 is offline
Senior Member
Join Date: Dec 22, 2012
Posts: 443

Hey Smokaijo, glad to see you found this great glass site! There's so much info here it's glorious.

As my friend Phill says, "Welcome to the Addiction!"
Reply With Quote
Old 2022-03-08, 4:29pm
Speedslug's Avatar
Speedslug Speedslug is offline
Join Date: Mar 21, 2009
Location: Winnebago, MN
Posts: 2,489

Aye and hide the bank numbers to the grandkids college accounts.

The most addictive glass can get real spendy in a hurry.
The Zombie Apocalypse is Upon Us.
Reply With Quote
Old 2022-03-08, 5:28pm
rcktscientist rcktscientist is offline
Senior Member
Join Date: Jun 19, 2021
Location: los angeles
Posts: 135

There are epoxies that work with glass. You could always make some soft parts and some boro parts and then 'combine' the different glasses by adhering them to each other after cool down. Not quite the same but it's an idea...
Reply With Quote
Old 2022-04-29, 1:09am
s0201228 s0201228 is offline
Junior Member
Join Date: Aug 06, 2021
Posts: 15

You cannot use Bullseye & Boro together, since there COE is too far apart.

I made marbles and mixed soft glass into Boro mistakenly before, and here is the result:

1. The Boro mixture became soft (because soft glass was added).

2. It is full of cracks inside, like cracked ice. But is still a marble shape.
Reply With Quote

boro, bullseye, compatibility

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -7. The time now is 3:49pm.

Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Your IP: