Crescent


22:34 06th July 2008

We can supply PMMA on a reel ready to be cut and ported on site or complete glass or PMMA harnesses fully assembled. PMMA has advantages over glass where transmission losses are concerned - see tables below.

On-site assembly of PMMA is more adaptable as it avoids the requirement for precise measurements of glass harness lengths.

We have completed thousands of PMMA installations around the world and site temperatures vary from -40°C in Canada to +40°C in the Middle East.

PMMA FSPTe Data - Individual PMMA strands of 0.75mm each

Size	Fibre Strands	Active Fibre		Min. Permanent Bend Radius	Max. Tails per Lightprojector	Actual % of white left at
		Diam. (mm)	Area (mm²)	(mm)		3m	10m	20m
3	3	1.60	1.30	5.00	150	0.91	0.74	0.54
6	6	2.10	2.65	7.50	75	0.91	0.74	0.54
12	12	3.00	5.30	10.00	37	0.91	0.74	0.54
25	25	4.30	11.05	15.00	18	0.91	0.74	0.54
37	37	5.00	16.35	18.50	12	0.91	0.74	0.54
50	50	6.00	22.10	20.00	9	0.91	0.74	0.54
62	62	6.50	27.04	25.00	7	0.91	0.74	0.54
75	75	7.50	33.15	28.00	6	0.91	0.74	0.54
150	150	11.00	66.30	35.00	3	0.91	0.74	0.54
225	225	13.00	99.45	40.00	2	0.91	0.74	0.54
Maximum 2% per metre loss

All projectors will take up to 450 strands of PMMA fibre, however in certain circumstances 600 strands are possible. Please check with Crescent technical office for further advice.
See Accessories Page for port catalogue number FCREPxxx.

Glass Fibre Data - Individual glass strands of 0.05mm each

Size	Fibre Strands	Active Fibre		Min. Permanent Bend Radius	Max. Tails per Lightprojector	Actual % of white left at
		Diam. (mm)	Area (mm²)	(mm)		3m	10m	20m
¾	300	1.00	0.59	5	435	0.83	0.54	0.29
1½	600	1.50	1.17	8	230	0.83	0.54	0.29
3	1200	2.00	2.34	15	130	0.83	0.54	0.29
8	3200	3.00	8.98	20	52	0.83	0.54	0.29
14	5600	4.00	15.71	25	30	0.83	0.54	0.29
24	9600	6.00	26.93	50	16	0.83	0.54	0.29
36	1920	7.20	37.63	60	10	0.83	0.54	0.29
Maximum 6% per metre loss