Can these be layered and used to hold up a fish tank? Or will they compress/breakdown from the weight?

I think they would be too flimsy and light to bear the weight of a fish tank full of water. There are a lot of airholes in these sheets. You would need a denser type of polystyrene foam for your purpose.

Can these be cut to a custom size by the seller?

I bought this product for my railway layout. For a hillside effect. I was able to cut it, to the right sizes I needed for my layout.Very easy to cut.

What are the products fire safety details? Is it fire resistant?

Hi there,,These sheets adhere to current building regulations.

Could I use this to insulate heat from a reptile heat mat so that the heat is projected into the habitat?

it depends if you want just insulation then yes, however, if you are looking to reflect heat into the habitat I would recommend something like a space blanket like this https://www.amazon.co.uk/Am-Tech-Emergency-Blanket-2-Pieces/dp/B005CRVKXW/ref=sr_1_2?ie=UTF8&qid=1513782943&sr=8-2&keywords=space+blankets

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5 Small White Rigid Polystyrene Foam Sheets Boards Slabs - Size 600mm Long x 400mm Wide x 25mm Thick - EPS70 SDN Floor Insulation Sheeting Packing Void Loose Fill Filler Protective

Product ID: 48000426

Details

Brand
UKPS
Item thickness
25 Millimetres
Material
Polystyrene
Product dimensions
60L x 40W
Recommended uses for product
Thermal

📏600x400x25mm precision size

🧊Rigid EPS70 for superior insulation

✂️Easily customizable with knife or hot wire

$285.91

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧱 Insulate, protect, and customize — the smart choice for savvy pros!

EFFORTLESS CUSTOMIZATION - Cut or shape easily to fit any packing or building project
MULTI FUNCTIONAL UTILITY - Ideal for floor insulation, protective packing, and void filling
PRECISION CUT DIMENSIONS - Perfectly sized 600mm x 400mm x 25mm sheets for versatile use
HIGH PERFORMANCE EPS 70 FOAM - Industry-grade rigid polystyrene ensures top-tier thermal insulation
TRUSTED QUALITY POPULARITY - Rated 4.5 stars by 293 pros, a go-to for DIY and building trades

This pack of 5 rigid white polystyrene foam sheets (600x400x25mm) offers high-grade EPS70 insulation, perfect for thermal floor insulation, protective packing, and void filling. Easy to cut and shape, these durable sheets are a favorite among DIYers and building professionals, boasting a 4.5-star rating from nearly 300 users.

Specifications

ASIN	B0164QUZN0
Best Sellers Rank	128,296 in DIY & Tools ( See Top 100 in DIY & Tools ) 110 in Panel Insulation
Brand	UKPS
Coverage	12.92 square feet
Customer Reviews	4.5 4.5 out of 5 stars (295)
Item Dimensions L x W	60L x 40W centimetres
Item Thickness	25 Millimetres
Material	Polystyrene
Number of Items	5
Part Number	3336013362598
Recommended Uses For Product	Thermal insulation, protective packing material
Unit Count	5.0 count

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