does the gasket comes off every time I open the lid?

No the gasket remains inside the lid within a given area. This is not a two piece lid like traditional Mason Jar lids. The gasket can be removed for cleaning. That said I was not happy with these lids. They leak unless you tighten them down so much they become very difficult to remove; especially if a hot substance creates a vacuum.

where are these made?

According to the packaging the company is in Canada and the tops are made in China.

Are they heat resistant?

Yes silicone is safe -50 to 500

Can silicone seals be purchased separately?

I bought normal metal inserts to use with these.

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Masontops Tough Tops - Wide Mouth Mason Jar Lid - White - BPA-Free Plastic Screw Caps - Reusable Airtight Storage Covers

Product ID: 48360268

Details

Brand
Masontops
Colour
White
Material
Plastic
Product dimensions
9.7L x 9.7W
Style
Compact

🔒Leak-proof airtight seal

🧴BPA-free, non-toxic plastic

❄️Dishwasher & freezer safe

60992CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Upgrade your jar game with leak-proof, toxin-free toughness!

VERSATILITY MEETS STYLE - Transform mason jars into chic organizers for kitchen, office, craft, or garage essentials.
SAFE SUSTAINABLE STORAGE - Crafted from BPA-free plastic, these lids keep your food and essentials toxin-free and eco-conscious.
EFFORTLESS GRIP NO MORE SLIPS - Faceted sides provide easy opening and prevent jars from rolling off your workspace.
BUILT TO LAST READY FOR ANYTHING - Durable plastic resists rust, warping, and withstands dishwasher and freezer extremes.
SEAL IN FRESHNESS LOCK OUT SPILLS - Precision silicone gasket ensures a leak-proof, airtight seal for worry-free storage anywhere.

Masontops Tough Tops are BPA-free, reusable wide mouth mason jar lids featuring precision-engineered silicone gaskets for an airtight, leak-proof seal. Designed with durable plastic that resists rust and warping, these dishwasher and freezer safe lids offer easy grip faceted sides and versatile use for food storage, organization, and more—perfect for the modern multitasking professional.

Specifications

ASIN	B01KU0HMY6
Best Sellers Rank	510,080 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 2,359 in Preserving
Brand	Masontops
Closure Type	Screw Top
Colour	White
Customer Reviews	4.6 4.6 out of 5 stars (4,649)
Included Components	Masontops Tough Tops - Wide Mouth Mason Jar Lid - White - BPA-Free Plastic Screw Caps - Reusable Airtight Storage Covers
Is the item dishwasher safe?	Yes
Is the item microwaveable?	No
Item Dimensions L x W	9.7L x 9.7W centimetres
Item Type Name	Mason Jar Lid
Item Weight	5 Ounces
Manufacturer	Masontops
Material	Plastic
Model Number	DIB-602964
Number of Packs	1
Number of Pieces	1
Part Number	TT4W
Product Style	Compact
Shape	Round
UPC	829188000110
Unit Count	1.0 count

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