is this a propylene glycol based product?

Yes, it contains propylene glycol.

Can I use this in my umbrella stand base and what ratio

I don't Know. We have used it to keep our hot tub from freezing this winter. After emptying the hot tub and clearing the water out of the pipework as much as possible, the jets were filled with the anti-freeze and the hot tub covered up. We won't know if it has worked until the spring. Sorry if that's not helpful.

Can this be used in a washing machine (kept in a shed outside and left over winter)

I don't see why not. I use it in all water holding equipment in my caravan. Just ensure its thoroughly flushed through when used for first time after winter.

How to use this? what ratio to mix so water will not turn to ice?

I use this to winterise a hot tub. I use it neat. I do not water it down. Hope that helps?

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46°C Non-Toxic Premium Anti-Freeze - 1 x 3.79 Litres

Product ID: 53963933

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🌊Volume: 3.79 Litres

🔧Corrosion Inhibitors: 30%

❄️Freezing Point: -46°C

Description

Stay Chill, Stay Protected! ❄️

EASY TO STORE - Compact dimensions (10 x 20 x 32 cm) make it a breeze to store.
VERSATILE USE - Perfect for boats, RVs, vacation homes, and pools.
CORROSION DEFENSE - 30% corrosion inhibitors ensure long-lasting protection.
NON TOXIC FORMULA - Safe for all materials including copper, brass, and plastics.
ULTIMATE FREEZE PROTECTION - Keep your water systems and engines safe from freeze-ups during storage.

STAR BRITE -46°C Non-Toxic Premium Anti-Freeze is a high-performance solution designed to protect your water systems and engines from freezing during storage. With a safe, non-toxic formula that is compatible with copper, brass, and all types of plastic, this anti-freeze is perfect for a variety of applications including boats, RVs, vacation homes, and pools. Its 30% corrosion inhibitors provide added protection, ensuring your systems remain in top condition.

Specifications

Manufacturer	Star Brite
Brand	STAR BRITE
Product Dimensions	10 x 20 x 32 cm; 4.8 kg
Manufacturer reference	31400EUR
Manufacturer part number	31400EUR
Item Weight	4.8 kg

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