If you need some new mastic sealant for your built-in hob top then look no further than eSpares. This may be just the part you're after. Sparks, I just tried burning a bit of the spare foam, and it seems to be heat-proof. I couldn't even get it to burn or melt properly by hold in directly in the gas flame. Not bad. I spilt some milk on the hob and some of it must have got between the hob and the worktop. At one stage a light was glowing...

5 Metre Sealing Foam Strip for Cooker Hobs or Kitchen Sinks

The spray-on sealer is water-based and non-corrosive, making it safe for granite, concrete, and most stone surfaces in addition to grout. The effective formula repels even tough stains from wine, oil, ink, and coffee, making it a great choice for kitchen counters and other dining surfaces. It's available in pint and quart spray bottles, as well as gallon jugs. A very common size is 600mm wide by 500mm deep. The size of the hole you will need to cut into your worktop will be smaller than the overall hob size.If the sealer leaves any hazy or white splotches on the tile, dampen a clean cloth with a bit of the grout sealer, and wipe the area until the blotch is gone. Now wipe the tile with a clean, dry cloth to remove any lingering residue. Nothing should be fitted in this “Hot Zone”. This includes any plugs, kitchen units or anything else that could burn or melt.

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Deane Biermeier, licensed carpenter and contractor, as well as member of The Spruce's Home Improvement Review Board, cautions, "Grout sealers are available in several 'easy application' forms, such as spray-and-walk-away. Although it’s not a hard and fast rule, an overly easy application sometimes equates to less protection or shorter-lasting results. Your extensive tile and grouting projects deserve the small amount of extra work that applying a high-quality sealer can provide, so don't bypass a sealer that requires a little more effort to apply it if that also means bypassing superior protection." While the specifics can vary, as a general rule, grout sealer is dry enough to walk on within two or three hours of application. However, it can take up to 48 hours for the sealer to cure completely, so wait a couple of days before allowing heavy traffic on your newly sealed tile floor, taking a shower or bath in a freshly sealed tub, or putting your just-sealed countertops to heavy use. Your hob is one of the most functional parts of your kitchen design, but that doesn’t mean it can’t look great too! Explore our comprehensive collection right here and choose the ideal kitchen hob to suit your taste and requirements. Essentially this is all common sense; you want it away from any draughts that might blow out the flame leaving gas flowing into your kitchen.The sealer is designed to repel oil and water, which can lead to extensive damage in the grout over time. In places where moisture is common, such as the kitchen or bathroom, this type of protection can reduce the amount of maintenance your grout and tiles will need after extensive use. The sealer helps repel food, grease, and mildew, as well as mold to prevent ugly stains and damage from developing. Like most grout sealers, this one is available in several container sizes, including spray bottles. I can't understand your problem, if the cut out is the right size for the appliance then the information from the techies is good.

Hob into a Kitchen Worktop | DIY Doctor Fitting a Gas Hob into a Kitchen Worktop | DIY Doctor

I can see the reason for the general "don't silicone hobs" rule, but if used sparingly, why can't it replace the foam (as a water seal) and avoid the problem described above? I.e. where the cover won't sit flush because the clamps can't compress the foam and/or flex the chassis while trying.

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I had my gas hob fitted today. The plumber was in a hurry and didn't get it square with the worktop and the foam was all over the place. Nice soldered joints though. This is just a guess, I would think the reason they say do not use a sealant, just in case anything goes wrong with the hob and it needs to be taken out. So to answer your question, it does seem to be heat-proof, but how much it needs to be is questionable.

Heat Resistant Silicone | Sealants | Screwfix Heat Resistant Silicone | Sealants | Screwfix

There are guidelines for “internal” kitchens, where a gas hob is fitted. This can occur when, for example, a conservatory has been built over the external wall, making the kitchen internal.

What is the Standard Hob Size?

There are some simple guidelines to follow when it comes to where you shouldn’t place your gas hob: A silicone sealant cannot be used in the installation process of the B12 hob. Only the sealing strip can be used. The strip has to go on the edge of the appliance, then trim the excess off, very gently, as not to scratch the hob or work surface." Of course, you can also use this easy-to-apply, fast-drying grout sealer spray on existing grout. It won't change the appearance or leave haze on the surrounding tile, whether that's natural stone, ceramic or porcelain tile, or masonry. As a bonus, the product sprays on without much over-spray and requires very little cleanup.