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SPLIT BIRD RINGS

Porzana makes a full range of split bird rings from sizes 2.0 mm diameter to 22.0 mm, plus clip rings and special rings for Guillemot, Razorbill and others. Rings for use on smaller, short-lived species are made from a magnesium-aluminium alloy, and incoloy (a nickel-chromium alloy) is used for most large, long-lived species and where excessive abrasion or exposure to saline or alkaline water would shorten ring life. For cost reasons, stainless steel is used for rings with a diameter greater than 12.5 mm. Although incoloy is a more expensive metal, it is more durable than stainless steel and is also preferred by our customers due to its better handling qualities, the rings being easier to close and less susceptible to ‘spring-back’ than pure steel. Most of our aluminium alloy rings are ‘C’ shaped, whereas the harder incoloy and steel rings are ‘V’ shaped for easier and better closing.

The table below shows the standard ring sizes produced, along with the equivalent British Trust for Ornithology (BTO), Australian Bird and Bat Banding Scheme (ABBBS) and US Fisheries and Wildlife Service (USFWS) reference codes. The internal diameter is the diameter of the ring when closed.

Alluninum Alloy Rings

Internal Diameter	BTO Ref	ABBBS Ref	USFWS Ref	Metal Height & Gauge	Ring Shape	Number Height	Rings per Packet
2.0 mm	AA	1	0A	5.5 x 0.38 mm	C	1.6 mm	100
2.3 mm	A	2	1	5.5 x 0.38 mm	C	1.6 mm	100
2.8 mm	B	3	1B	5.5 x 0.50 mm	C	1.6 mm	100
3.3 mm		4	1A	5.5 x 0.50 mm	V	1.6 mm	100
3.5 mm	CC		1D	5.5 x 0.50 mm	V	1.6 mm	100
4.0 mm		5	2	5.5 x 0.50 mm	V	1.6 mm	100
4.3 mm	C		2A	7.0 x 0.60 mm	V	1.6 mm	100
4.5 mm		6		7.0 x 0.60 mm	V	1.6 mm	100
5.25 mm	D		3B	7.0 x 0.60 mm	V	1.6 mm	100
2.5/4.0 mm	SO	K		4.0 x 0.38 mm		1.6 mm	50

Incoloy Rings

Internal Diameter	BTO Ref	ABBBS Ref	USFWS Ref	Metal Height & Gauge	Ring Shape	Number Height	Rings per Packet
2.3 mm	A2		1	5.5 x 0.35 mm	V	1.6 mm	100
2.8 mm	B2	3	1B	5.5 x 0.35 mm	V	1.6 mm	100
3.3 mm	B+	4	1A	5.5 x 0.35 mm	V	1.6 mm	100
4.0 mm		5	2	5.5 x 0.35 mm	V	1.6 mm	100
4.3 mm	C2		2A	5.5 x 0.35 mm	V	1.6 mm	100
4.5 mm		6		5.5 x 0.35 mm	V	1.6 mm	100
4.75 mm			3	5.5 x 0.35 mm	V	1.6 mm	100
5.25 mm	D2		3B	7.0 x 0.56 mm	V	2.4 mm	100
5.5 mm		7	3A	7.0 x 0.56 mm	V	2.4 mm	100
6.35mm			4	7.0 x 0.56 mm	V	2.4 mm	100
7.0 mm	Esp		4A	7.0 x 0.56 mm	V	2.4 mm	50 or 100
8.0 mm			5	9.0 x 0.85 mm	V	3.2 mm	50 or 100
9.0 mm	FV			9.0 x 0.85 mm	V	3.2 mm	50 or 100
9.5 mm			6	9.0 x 0.85 mm	V	3.2 mm	50 or 100
11.0 mm	G		7A	9.0 x 0.85 mm	V	3.2 mm	50 or 100
12.5 mm	H		7	9.0 x 0.85 mm	V	3.2 mm	50
9.0 mm	FC			8.7 x 0.60 mm	C	3.2 mm	50
Razorbill	Raz		5R	9.0 x 0.85 mm		3.2 mm	50
Guillemot	Guil		6M	9.0 x 0.85 mm		3.2 mm	50
16.0 mm				8.7 x 0.60 mm	Clip	3.2 mm	10
19.0 mm				8.7 x 0.60 mm	Clip	3.2 mm	10
22.0 mm				8.7 x 0.60 mm	Clip	3.2 mm	10
26.0 mm	M. Inc			8.7 x 0.60 mm	Clip	3.2 mm	10

Stainless Steel Rings

Internal Diameter	BTO Ref	ABBBS Ref	USFWS Ref	Metal Height & Gauge	Ring Shape	Number Height	Rings per Packet
11.0 mm	GG	11	7A	12.0 x 1.00 mm	V	3.2 mm	50
12.5 mm		27	7	12.0 x 1.00 mm	V	3.2 mm	50
14.0 mm	J	12	7B	12.0 x 1.00 mm	V	3.2 mm	50
16.0 mm	K	13	7D	12.0 x 1.00 mm	V	3.2 mm	50
18.0 mm		28	8	12.0 x 1.00 mm	V	3.2 mm	50
19.0 mm	L	14		12.0 x 1.00 mm	V	3.2 mm	50
22.0 mm		15	9	12.0 x 1.00 mm	V	3.2 mm	50
26.0 mm	Mb	15	9	12.0 x 1.00 mm	Clip	3.2 mm	10

BAT RINGS

Porzana manufactures special lipped bat rings which have been designed to minimise the risk of damage to the bat’s wing membrane, which is known to occur when standard split bird rings are fitted. The rings are made either of a soft aluminium/magnesium alloy or of the harder and more durable incoloy (a nickel-chromium alloy). The rings are made on hand-presses and care is taken at each manufacturing stage to ensure all sharp edges are removed.

There are five sizes of alloy rings (2.4, 2.9, 4.2, 5.2 and 6.5 mm), and both the 2.4 and 2.9 mm sizes are made in either 4.0 mm or 5.5 mm wide material. The incoloy rings are made in three sizes (2.8, 3.5 and 5.2 mm). The table below gives full details of the products we manufacture. Although the rings are produced on a round mandrel, they become slightly oval shaped when closed. The sizes listed below are across the width of the oval at its widest part when the gap is closed to 1.0 mm, but the shape and size of the closed ring will vary according to the closing method adopted.

Alluninum Bat Rings

Approx internal width when gap closed to 1 mm		Metal Height & Gauge		Rings per packet
2.4 mm (narrow)	4.0 x 0.38 mm		50
2.4 mm (wide)	5.5 x 0.38 mm		50
2.9 mm (narrow)	4.0 x 0.38 mm		50
2.9 mm (wide)	5.5 x 0.38 mm		50
4.2 mm	5.5 x 0.50 mm		50
5.2 mm	5.5 x 0.50 mm		50
6.5 mm	7.0 x 0.60 mm		50

Incoloy Bat Rings

Approx internal width when gap closed to 1 mm	Metal Height & Gauge	Rings per packet
2.8 mm	5.5 x 0.35 mm	50
3.5 mm	5.5 x 0.35 mm	50
5.2 mm	5.5 x 0.35 mm	50

PENGUIN FLIPPER BANDS

Porzana makes 5 sizes of stainless steel penguin flipper bands, covering a wide range of species from Rockhopper to King Penguin. When closed the bands are ‘egg’ shaped and the internal diameters quoted refer to the length and the width of the band at the widest point. Most bands are ‘side-opening’, and these bands must always be fitted with the join on the outside of the flipper. Although the bands can usually be closed by hand, it is sometimes necessary to complete the closing with a pair of standard bull-nosed pliers.

The table below gives full specifications of the range of penguin bands we manufacture.

Penguin Flipper Band Sizes

Internal Diameter	Metal Height & Gauge	Type of Opening
31 x 17 mm	12.0 x 1.0 mm	Side
34 x 17 mm	12.0 x 1.0 mm	Side
34 x 19 mm	12.0 x 1.0 mm	End
37 x 17 mm	12.0 x 1.0 mm	Side
53 x 27 mm	12.0 x 1.6 mm	Side

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