Oster Classic Series (Glass Jar)
One of the last countertop blenders with a real glass jar - the blend path is glass, stainless blade, and a rubber sealing ring; only the lid is plastic.
The verdict: Minimal plastic contact
The jar is glass (Oster's thermal-shock-resistant "Boroclass") and the four-point blade is stainless steel, so the part of the blend where friction and heat generate microplastics - the jar wall and blades - is glass and steel, not Tritan. The seal between the jar and blade base is a food-grade EPDM rubber ring. The lid and its removable center cap are plastic; when the jar is full or you pour, liquid does contact the plastic lid, so this is not silicone-only. But compared with a Tritan-jar blender it puts far less plastic in the food path - the lid is the only plastic contact, not the whole jar.
What it's made of
| Part | Material | Food contact |
|---|---|---|
| jar Oster "Boroclass" thermal-shock-resistant glass jar; exact glass chemistry (borosilicate vs tempered soda-lime) not definitively documented - treated as glass either way | Soda-Lime Glass | Yes primary |
| blade Crush Pro 4 four-point stainless steel blade; specific grade not stated by Oster | Stainless Steel grade unspecified | Yes primary |
| jar-to-blade sealing ring food-grade EPDM rubber gasket between the jar base and blade assembly | EPDM Rubber | Yes seal |
| lid plastic lid; contacts liquid when the jar is full or when pouring | Plastic other / unspecified | Yes primary |
| lid center / filler cap removable plastic measuring/filler cap in the lid | Plastic other / unspecified | Yes primary |
The archetypal all-metal-drive glass-jar blender, sold for decades and still available new. A heavy Boroclass glass jar sits on a threaded base that holds the stainless blade and a rubber sealing ring; the motor base uses an all-metal drive coupling (10-year all-metal-drive warranty). Glass jars have largely vanished from the blender market over blade-speed liability, which makes this long-running legacy line unusual and easy to find in a plastic-jar field.
Pros
- Real glass jar and stainless blade - no Tritan in the friction/heat blend path
- All-metal drive; inexpensive and widely available
- Glass jar is dishwasher safe and non-reactive
Cons
- Lid and center cap are plastic and do contact liquid when full/pouring
- Glass jar is heavy and breakable
- Not as powerful or smooth as a high-end blender
Notes
- Sold under several model numbers (e.g. Classic Series Heritage, BLSTAJ 6-cup glass jar); look for the 6-cup Boroclass glass jar SKUs specifically - Oster also sells plastic-jar models
- Replacement glass jars, stainless blades, and rubber sealing rings are cheap and widely available
Common questions
Does the Oster Classic Series (Glass Jar) have plastic in it?
Yes. On the Oster Classic Series (Glass Jar), the jar-to-blade sealing ring, lid and lid center / filler cap are plastic and sit in the food path. The rest of what touches your food is Soda-Lime glass and stainless steel.
What is the Oster Classic Series (Glass Jar) made of?
Part by part, the Oster Classic Series (Glass Jar) is: jar — Soda-Lime glass; blade — stainless steel; jar-to-blade sealing ring — EPDM rubber; lid — plastic; lid center / filler cap — plastic.
Categories: Blenders
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://www.oster.com/blenders/kitchen-blenders/oster-classic-series-heritage-blender-with-6-cup-glass-jar-stainless-steel/SP_395331.html manufacturer lists a 6-cup Boroclass glass jar and a Crush Pro 4 stainless steel blade with an all-metal drive
- review https://www.goodmans.net/i/2846/gray-blj-seal-fits-oster-blenders.htm replacement-parts vendor identifies the Oster jar-to-blade sealing ring as food-safe EPDM rubber, seated between the top of the blade and the bottom of the jar
Spot a mistake or something out of date? Let us know — corrections are how this stays accurate.