HDPE Pall Ring

HDPE Pall Ring

HDPE Pall ring is a random tower packing moulded from high-density polyethylene. Like PP it is a low-cost polyolefin with strong resistance to acids, alkalis and salts, but it differs in two ways: it takes less heat, running to about 60°C against PP's roughly 100, and it stays tough and impact-resistant in the cold, well below freezing, where PP can turn brittle. It is also very inert chemically and holds up to abrasion. That makes it a natural pick for cool or cold corrosive duty, water and effluent service, and outdoor towers. We make it in sizes from 16 to 76 mm.

High-density polyethylene — a low-cost, chemically inert polyolefin.
Strong resistance to acids, alkalis, salts and a wide range of aqueous streams.
Tough and impact-resistant far below freezing, where PP can embrittle.
Good abrasion and stress-crack resistance; open Pall-ring form for high void and low pressure drop.
Works to about 60°C — below PP, so best for cool, cold or ambient duty.

Technial Parameters

Size (mm)	Specific surface area (m²/m³)	Void fraction	Pieces per m³ (approx.)
16	≈225	≈90%	≈210,000
25	≈225	≈90%	≈52,000
38	≈140	≈90%	≈13,600
50	≈105	≈90%	≈6,500
76	≈90	≈92%	≈1,930

Property	Value
Product Type	Plastic random packing (Pall ring)
Material	High-density polyethylene (HDPE / PE)
Standard Sizes	16, 25, 38, 50, 76 mm
Structure	Cylinder with rows of windows and inward tongues
Void Fraction	About 90%
Max Service Temperature	About 60 °C
Chemical Resistance	Acids, alkalis, salts, many aqueous streams
Strengths	Cold and impact toughness, abrasion and stress-crack resistance, low cost
Not Suited To	Hot streams (use PP or CPVC); strong oxidisers; hot organic solvents
Vs PP	Lower heat, but tougher in the cold and better on abrasion
Applications	Cool / cold corrosive scrubbing, water and wastewater, absorption, outdoor towers
Trademark	RONGJIAN
Origin	Jiangxi, China
HS Code	8419909000
Transport Package	Woven bags / cartons / drums

FAQs

What is an HDPE Pall ring used for?

HDPE Pall ring suits packed columns that run cool rather than hot. Its common jobs are water and wastewater treatment, cool acid and alkali scrubbing, absorption and degassing, and corrosive service near ambient temperature. Because it stays tough in the cold and resists abrasion, it also fits outdoor towers, cold climates, and streams carrying some solids that would wear other packings down. It is a low-cost, chemically inert choice wherever the temperature stays modest and broad chemical resistance and durability matter more than heat tolerance.

How does HDPE differ from PP?

HDPE and PP are both cheap, chemically inert polyolefins, and they resist much the same acids, alkalis and salts. The differences are heat and toughness. PP holds up to a higher temperature, about 100 degrees against roughly 60 for HDPE, so warm duty goes to PP. HDPE, though, stays tough and impact-resistant when it is cold, well below freezing, where PP can grow brittle, and it has good abrasion and stress-crack resistance and slightly broader chemical inertness. So the rule is simple: pick PP when the column runs warm, and HDPE when it runs cool or cold, when knocks or abrasion are a worry, or when its particular resistance suits the stream.

What temperature and chemicals can HDPE Pall rings handle?

HDPE runs continuously to about 60 degrees, lower than PP, which is its main limitation — for anything hot it is the wrong material. On chemistry it is excellent: it resists most acids, alkalis and salts, a wide range of aqueous corrosive streams, and some chemicals that trouble other plastics, and it is very inert overall with strong stress-crack resistance. Its weak points are the usual polyolefin ones — strong oxidisers and hot organic solvents are best avoided, and heat past its limit softens it. For cool or cold acid, alkali, salt or water-based duty, HDPE is a dependable and inexpensive choice.

When should I choose HDPE over PP or other plastics?

Choose HDPE when the stream is corrosive but stays cool, and above all when cold or knocks come into it. A column running near or below ambient, an outdoor tower in a cold climate, or a line carrying abrasive solids all play to HDPE's strengths: it keeps its toughness where a more brittle plastic would crack, and it wears well. The single thing that rules it out is heat — once the duty runs warm, a higher-rated plastic has to carry it instead. So the deciding question is temperature first, then whether cold-toughness or abrasion is in play. Send the medium and its temperature and we will say whether HDPE fits.

HDPE is high-density polyethylene, the polyethylene sibling to a PP ring and, like it, cheap and highly inert. Their corrosion resistance overlaps heavily — acids, alkalis, salts and most aqueous streams are fine for either — so what separates them is temperature and toughness, not chemistry. The one clear drawback of HDPE is heat: it softens sooner than PP, which makes it a cool-service material. Its offsetting strengths are that it stays tough and impact-resistant at low temperatures, well below freezing, where PP can go brittle, and that it resists abrasion and stress-cracking and is exceptionally inert across a wide range of media. In the standard windowed ring shape, all of this arrives as a rugged, inexpensive packing built for the cooler end of the range.

Put next to PP, the trade is easy to read:

	PP	HDPE
Max service temperature	~100°C	~60°C
Cold and impact toughness	Can embrittle when cold	Stays tough well below zero
Abrasion and stress-crack resistance	Good	Very good
Chemical resistance	Acids, alkalis, salts	Acids, alkalis, salts; slightly broader
Relative cost	Low	Low, often a little less

The limits are simple to state. Heat is the main one: once a stream runs warm, HDPE is out of its depth and a higher-rated plastic should carry the load; strong oxidisers and hot solvents are best handled elsewhere too. What HDPE does own is cool and cold corrosive work — municipal and industrial water, wastewater, ambient acid and alkali scrubbing, degassing, and towers left outdoors in cold weather where brittleness would end a packing's life. Throw in abrasive or solids-laden liquid, where its wear resistance tells, and HDPE becomes the obvious pick. Across that band it pairs broad chemical resistance with rugged, cold-tolerant service at close to the lowest price on the shelf.