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Physical requirements should include specific quantitative information according to the classification.

TABLE 1‐1. POM Polyoxymethylene (Acetal) Materials, Detail Requirements, ^hNatural Color Only

Group	Description	Class	Description	Grade	Descriptiona	Flow Rate, ISO 1133b (g/10 min)	Melting Point, ISO 3146/ Method C2c (°C, min)	Density, ISO 1183 (g/cm3)	Tensile Strength, ISO 527d (MPa, min)	Flexural Modulus, ISO 178e (MPa, min)	Izod Impact Resistance, ISO 180/1Af (KJ/m2, min)	Deflection Temperature, ISO 75/Method A,g 1.82 MPa (°C, min)
1	Homopolymer	1	General purpose	1		<8	170	1.39–1.44	65	2400	8.5	100
			and high flow	2		8–16	170	1.39–1.44	65	2700	5.0	100
				3		16–28	170	1.39–1.44	65	2700	4.5	105
				4		28–55	170	1.39–1.44	65	2700	4.0	105
				0	Other
		2	Fast cycle	1		11–18	170	1.39–1.44	65	2400	4.5	100
				2		19–33	170	1.39–1.44	65	2400	4.0	100
				0	Other
		3	UV stabilized	1		<8	170	1.39–1.44	65	2400	8.5	100
				2		8–16	170	1.39–1.44	65	2700	5.0	100
				0	Other
		4	Impact modified	1		<3	170	1.31–1.37	35	1100	70	70
				2		8–15	170	1.36–1.42	45	1900	9.0	80
				0	Other
		5	Recycle—	1	(Same properties as Group 1 Class 1 Grade 1)
			general	2	(Same properties as Group 1 Class 1 Grade 2)
			purpose and	3	(Same properties as Group 1 Class 1 Grade 3)
			high flow	4	(Same properties as Group 1 Class 1 Grade 4)
		6	Recycle—fast	1	(Same properties as Group 1 Class 2 Grade 1)
			cycle	2	(Same properties as Group 1 Class 2 Grade 2)
		7	Recycle—UV‐	1	(Same properties as Group 1 Class 3 Grade 1)
			stabilized	2	(Same properties as Group 1 Class 3 Grade 2)
		8	Recycle—impact	1	(Same properties as Group 1 Class 4 Grade 1)
			modified	2	(Same properties as Group 1 Class 4 Grade 2)
		0	Other	0	Other
2	Copolymer	1	General purpose	1		<4	160	1.38–1.43	58	2300	5.5	90
			and high flow	2		4–7	160	1.38–1.43	58	2300	4.5	90
				3		7–11	160	1.38–1.43	58	2300	4.0	95
				4		11–16	160	1.38–1.43	58	2300	4.0	95
				5		16–35	160	1.38–1.43	58	2300	3.5	95
				6		35–60	160	1.38–1.43	58	2300	3.0	95
				7		60+	160	1.38–1.43	58	2300	2.5	95
				0	Other
		2	UV‐stabilized	1		<4	160	1.38–1.43	58	2300	5.5	90
				2		4–7	160	1.38–1.43	58	2300	4.5	90
				3		7–11	160	1.38–1.43	58	2300	4.0	95
				4		11–16	160	1.38–1.43	58	2300	4.0	95
				5		16–35	160	1.38–1.43	58	2300	3.5	95
				6		35–60	160	1.38–1.43	58	2300	3.0	95
				7		60+	160	1.38–1.43	58	2300	2.5	95
				0	Other
		3	Impact modified	1		11–26	155
				2		11–26	155
				3		4–11	155	1.34–1.40	40	1500	6.0	70
				4		5–11	155
				5			155
				0	Other
		4	Flexural	1		<20	155	1.26–1.32	20	800	12.0	50
			modified	0	Other
		5	Recycle—	1	(Same properties as Group 2 Class 1 Grade 1)
			general	2	(Same properties as Group 2 Class 1 Grade 2)
			purpose and	3	(Same properties as Group 2 Class 1 Grade 3)
			high flow	4	(Same properties as Group 2 Class 1 Grade 4)
				5	(Same properties as Group 2 Class 1 Grade 5)
				6	(Same properties as Group 2 Class 1 Grade 6)
				7	(Same properties as Group 2 Class 1 Grade 7)
		6	Recycle—UV‐	1	(Same properties as Group 2 Class 2 Grade 1)
			stabilized	2	(Same properties as Group 2 Class 2 Grade 2)
				3	(Same properties as Group 2 Class 2 Grade 3)
				4	(Same properties as Group 2 Class 2 Grade 4)
				5	(Same properties as Group 2 Class 2 Grade 5)
				6	(Same properties as Group 2 Class 2 Grade 6)
				7	(Same properties as Group 2 Class 2 Grade 7)
		7	Recycle—impact‐	1	(Same properties as Group 2 Class 3 Grade 1)
			modified	2	(Same properties as Group 2 Class 3 Grade 2)
				3	(Same properties as Group 2 Class 3 Grade 3)
				4	(Same properties as Group 2 Class 3 Grade 4)
				5	(Same properties as Group 2 Class 3 Grade 5)
		8	Recycle—flexural	1	(Same properties as Group 2 Class 4 Grade 1)
			modified	0	Other
		0	Other	0	Other
3	Terpolymer	1	High melt strength	1		<2	160	1.38–1.43	56	2250	3.5	90
				0	Other
		2	Recycle—high	1	(Same properties as Group 3 Class 1 Grade 1)
			melt strength	0	Other
		0	Other	0	Other
0	Other	0	Other	0	Other

^a No descriptions are listed unless needed to describe a special grade under the class. All other grades are listed by requirements.

^b Flow rate: 190/2.16 (T/M).

^c Melting point rate 10 °C/min. Tm second melting curve.

^d Tensile strength shall be determined using a Type I tensile specimen as described in ISO 527. Crosshead speed shall be 50 mm/min ± 10%.

^e Flexural modulus shall be determined by specimen 80 ± 2 mm × 10 ± 0.2 mm × 4 ± 0.2 mm as described in ISO 178.

^f Izod shall be determined by specimen 80 ± 2 mm × 10 ± 0.2 mm × 4 ± 0.2 mm (Method A).

^g Deflection temperature shall be determined by specimen 120 ± 2 mm × 10 ± 0.2 mm × 4 ± 0.2 mm.

^h Data on 4‐mm test specimens are limited and the minimum values may be changed in a later revision after a statistical database of sufficient size is generated.